Re: [lopsa-tech] Faster than 1G Ether... ESX to ZFS

On 11/12/2010 9:19 AM, Edward Ned Harvey wrote: Since combining ZFS storage backend, via nfs or iscsi, with ESXi heads, I'm in love. But for one thing. The interconnect between the head & storage. 1G Ether is so cheap, but not as fast as desired. 10G ether is fast enough, but it's overki

Re: [lopsa-tech] Faster than 1G Ether... ESX to ZFS

On 11/12/2010 10:58 PM, Edward Ned Harvey wrote: >> From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org] >> On Behalf Of Edward Ned Harvey >> >> 1G Ether is so cheap, but not as fast as desired. 10G ether is fast > enough, but > > What exactly is infiniband, or brocade switches

Re: [lopsa-tech] Recommendations for expandable UPS systems?

On 11/17/2010 3:13 PM, Brad Knowles wrote: > On Nov 17, 2010, at 11:30 AM, Daniel Clark wrote: > >> Thanks - at least one useful thing I've gotten from this thread is >> that whatever I end up doing, it would seem to make sense to have >> smaller COTS "front end" UPS units, connected to whatever ba

Re: [lopsa-tech] Recommendations for expandable UPS systems?

I'll reemphasize some earlier points and make some of my own. On 11/17/2010 11:37 AM, Daniel Clark wrote: > Looking for a UPS system that: > > 1. Runs off of US 115V / 20A That isn't much power. Remember, you can only use 16A of a 20A circuit, that limits the size of your UPS and your load to abo

Re: [lopsa-tech] Recommendations for expandable UPS systems?

Oh, and I strongly recommend against having an HVAC system on the same (small) UPS as your other gear. HVAC motors cause a LOT of transient noise and have a very high peak load when the compressor starts up. The type of load is also of a nature that is different than computer load. Your compu

Re: [lopsa-tech] Infiniband installation and management

On 11/18/2010 10:53 AM, Yves Dorfsman wrote: > > I need a reality check here, and would really appreciate feed back from people > experience in managing IB. Thanks. > We do it how you proposed, but we have a DDR vs QDR which is pre some of the cool inventions in Voltaire's GridStack UFM architect

Re: [lopsa-tech] Moving a few servers from colo back to office

One thing that I didn't see people mention.. The actual amount of energy you need to spend to remove that heat will very dramatically (drastically even) depending upon your cooling arrangement. If you are just dumping cool air into the roomt and mixing it in with the warm and and have no separat

Re: [lopsa-tech] Moving a few servers from colo back to office

Oh, and one other thing. get 208V 30A circuits installed. If you can, do 3 phase with a 3 phase PDU.. You can get 1.7X more power over the same physical piece of wire with 3 phase as you can with single phase, and you'll gain about 2-3% efficiency.. That means less cooling overhead, better oper

Re: [lopsa-tech] Infiniband installation and management

big news today. Mellanox just announced that they are acquiring Voltaire. It'll be a good fit since the tech talent of both is in Israel. There's a fair amount of overlap and it gives Mellanox some nice 10G switch/chassis solutions. That leaves Qlogic as the only competitor in IB space. _

Re: [lopsa-tech] Fiber or copper between Switches

On 11/29/2010 1:43 PM, Paul Graydon wrote: You can actually do 10Gb ethernet over copper, needs to be cat 6A cables though, and it's only good for 100m. By the time you start faffing about with stuff like that I figure the answer is fiber. Hrm, the cat-6A specification calls for higher Mhz, u

Re: [lopsa-tech] Recommendations for expandable UPS systems?

On 11/29/2010 4:18 PM, Chris Hoogendyk wrote: > > > They recommend a larger UPS or one designed with extra batteries for > longer runtime. > > Since they listed item 4 and said, "in most cases," one might assume > that the UPSs they manufacture and sell still provide a > step-approximated sine w

Re: [lopsa-tech] Fiber or copper between Switches

On 11/29/2010 6:03 PM, Jeff Wasilko wrote: > On Mon, Nov 29, 2010 at 01:55:25PM -0500, Doug Hughes wrote: >> Hrm, the cat-6A specification calls for higher Mhz, up to 500Mhz (twice >> cat-6), but I don't know of a single vendor using cat6a for 10G. The >> current standard

Re: [lopsa-tech] Recommendations for expandable UPS systems?

On 11/29/2010 6:47 PM, Luke S Crawford wrote: > Doug Hughes writes: > >> One thing worth mentioning.. Nobody in their right mind ought to chain a >> Back UPS after another Back UPS... Yikes... > Right... but what about daisy chaining a small, cheap UPS off of > the giant U

Re: [lopsa-tech] Fiber or copper between Switches

On 11/29/2010 11:01 PM, John BORIS wrote: > Well I pulled the cable out of the wall connector while it was still > connected to my switch and held a piece of paper against it and could > see a light on the paper which tells me my fiber module is working. I > then connected it to the wall outlet and

Re: [lopsa-tech] Recommendations for expandable UPS systems?

On 11/30/2010 9:45 AM, Jack Coats wrote:On 11/30/2010 1:29 AM, Matt Simmons wrote: > Hi Doug, > > I want to announce the first meeting soon, and the date that I'm > aiming for is Tuesday, December 14th (2nd Tuesday of the month). Would > your space be available for that time, say 6:30pm to 8:30pm

Re: [lopsa-tech] Fiber or copper between Switches

> Tom Limoncelli writes: > >> That's why it is so important to make sure the cables are certified. >> It isn't enough to use the right parts, you need to test it to verify >> that it will really work. There are people that will install cable in >> your walls and not do certification. Some will t

Re: [lopsa-tech] PFC in PSUs

> On Tue, Nov 30, 2010 at 11:59:57PM -0800, Tom Perrine spake thusly: >> (This is why HP and some other blade chassis actually shut down extra >> power supplies when the internal load is low, it is better to run >> fewer supplies are closer to 90-100% of their max, than to run more >> supplies at 2

Re: [lopsa-tech] ethernet infiniband dark fibre router...

On 12/13/2010 8:20 AM, Conrad Wood wrote: > Hello... > > I got some disparate technologies to interconnect and I have little > experience on some of those ;) > Essentially, we have internet connections delivered via two dark fibre > links, an infiniband cluster in our datacenters and an ethernet >

Re: [lopsa-tech] ethernet infiniband dark fibre router...

On 12/14/2010 1:42 AM, Conrad Wood wrote: >> What is running on your Internet links? OC-3? ethernet? ATM? There is >> certainly technology that will bridge 10G ethernet and Infiniband (and >> SAN for that matter). Mellanox, Voltaire, and Qlogic all make things >> based upon Mellanox's BridgeX chip

Re: [lopsa-tech] RAID cards with flash-backed cache?

> another is the write speed, flash is relativly slow to write to, I would > not expect it to have nearly the performance of battery-backed ram. Be careful with broad statements without qualification. All flash is not created equal.. Far from it. The Intel X-25 series are blazing fast for writes

Re: [lopsa-tech] software raid under linux

On 12/23/2010 1:18 PM, Andrew Hume wrote: > we (some folks at work) have built two backblaze boxes > (roughly speaking, a linux box with 45 2TB drives). > > i think i know how to deploy such a beast, but wanted to check > my understanding, which is that mdadm is the tool of choice, > and that for p

Re: [lopsa-tech] Question concerning the http request process

On 1/12/2011 8:53 PM, Adam Levin wrote: > On Wed, 12 Jan 2011, John BORIS wrote: >> The only thing between the servers I am testing is the electronics of >> the switch. they attach to the same switch. > Ok, I'm not a network engineer (INANE? Hoo, boy!) so someone can correct > me if I'm wrong, bu

Re: [lopsa-tech] Server Recommendations

On 1/14/2011 12:52 PM, Steven Kurylo wrote: > On Fri, Jan 14, 2011 at 9:23 AM, Daniel Pittman wrote: >> On Jan 14, 2011 9:12 AM, "Roy McMorran" wrote: >> >>> Apologies in advance if I'm covering old ground here. I'd swear I'd seen >>> a similar discussion recently but I haven't been able to find

Re: [lopsa-tech] Current state of tech for mailservers?

On 1/23/2011 10:04 AM, Matthew Barr wrote: > I'm researching a new build of my mailserver. I'd like to figure out what's > the best option for dealing w/ Antispam / AV, as well as the other processes.. > > I know of 2 major choices- do it your self, or outsource. I'm not > looking to outs

Re: [lopsa-tech] SCSI hard drive availability

On 1/25/2011 5:04 PM, Steven Kurylo wrote: > Hi, > > I was looking for some replacement 147GB 10k SCSI drives today, and it > looks like no one makes them anymore. Seagate and Toshiba seem to be > the only suppliers left, and they only offer 15k in that size. I > could buy drives directly from HP

Re: [lopsa-tech] infiniband...

On 2/4/2011 9:25 AM, Yves Dorfsman wrote: >> I have some trouble with infiniband - and admittedly I am an infiniband >> novice. I get 7GBit/s using TCP (iperf/wget and others). Oddly though >> because it's a QDR (40GBit/s) switch. >> Same results with 2.6.36, 2.6.38-rc2 kernel. >> QLogic PCI-e card

Re: [lopsa-tech] infiniband...

On 2/4/2011 1:11 PM, Conrad Wood wrote: > >> Re: 7gbits/etc. As others have said, you're over-running your CPU. IP >> over IB works just fine, but the packet sizes aren't matched up. What >> you really want to do is test it using actual native infiniband >> protocols. I recommend the Intel Benchmar

Re: [lopsa-tech] experience with isilon?

On 2/4/2011 12:41 PM, Jeff Wasilko wrote: > we're at an upgrade point on our existing NFS servers and we're starting > to look at our options and I was wondering what experience people have > with Isilon? > > We have a fairly small dataset (10TB) but lots of I/O (40-70,000 nfs > ops, with about 10,

Re: [lopsa-tech] getting specific netflow analysis

On 2/12/2011 1:54 PM, Mark D. Nagel wrote: On 2/7/2011 4:02 PM, Jeremy Charles wrote: There are three things I've not found together in any netflow analysis products that I've tried so far: 1) A host on my network is receiving traffic from hundreds of remote hosts out on the Internet. I'd

Re: [lopsa-tech] Metro Ethernet

> Our current internet connection contract is about to be expired. I am looking > to cut cost(I guess we all do these days). TWTC is offering Metro Ethernet > solution by bringing in both voice and data in one package. Also, they will > be bringing in their own routers and I really don't like ha

Re: [lopsa-tech] VM deployment on demand

On 3/2/2011 8:18 AM, Ari Constancio wrote: > Hi, > > I'm looking for advice on how to deploy VMs (mostly Windows) on demand > on our lab machines (hundreds). > > My basic idea is to have a minimal Linux system (local or remote with > PXE boot), the user to authenticate, and then to choose a VM to s

Re: [lopsa-tech] large-scale disk

On 3/8/2011 12:22 AM, Andrew Hume wrote: while i am no stranger to large data, i have found myself outside my comfort zone at work. the department i have joined (i lateralled within research) has traditionally used Sun as mid-range storage and Hitachi as their high-end. we now need to look at

Re: [lopsa-tech] VLAP routing and ARP on a trunk port?

On 3/8/2011 11:11 PM, Atom Powers wrote: > I haven't seen this before and it's causing me all kinds of headache. > > I have a Cisco 3560G with > * some local VLAN interfaces and RIP2 > * a router-on-a-stick and RIP2 (on a trunk port) > * a Xen server on a trunk port (VMs can be on one or more of th

Re: [lopsa-tech] Email notify programs

> I am searching for an app that will monitor an email account and pop up > a message or alert on my PC when new mail arrives. I have a number of > servers that have mail going to root. I don't want them forwarded to my > normal email as that gets enough traffic so I am going to configure them > to

Re: [lopsa-tech] Odd question regarding Zabbix/Nagios and bandwidth tracking

> Friends from university days asked me an intriguing question the other day. > > How would you configure either Nagios or Zabbix to monitor how much data > has flowed through a particular Ethernet interface for, say, the past 31 > days? > > I guess the idea is to set an alarm if they start to appr

Re: [lopsa-tech] amount of swap

On 4/20/2011 10:02 AM, Yves Dorfsman wrote: >> its not like we don't have the disk; >> these systems have 11TB of SAN/NAS and 600GB of in-the-box RAID >> serving / and /tmp. > This makes a big difference, a lot of my machines have only 1 TB to 4 TB of > local disk, and I do want a lot of space for

Re: [lopsa-tech] amount of swap

On 4/20/2011 11:13 AM, Dan Foster wrote: > Hot Diggety! Michael C Tiernan was rumored to have written: >> - Original Message - >>> From: "Adam Tauno Williams" >>> Most recommendations I see [...] >> The thing I keep seeing is stuff that discusses about how much the >> system "*needs*". Ther

Re: [lopsa-tech] Recommend a 10Gpbs switch at a nice price

On 4/21/2011 2:20 PM, Will Dennis wrote: Hello LOPSA-Techies, We have a research dept here that's looking for a 24-port 10Gbps-per-port switch at a good price point. They would like a managed switch (does anyone even make a 10G unmanaged switch??) They do not have Cisco/Juniper/HP budget ;)

Re: [lopsa-tech] Recommend a 10Gpbs switch at a nice price

On Fri, Apr 22, 2011 at 8:15 AM, Edward Ned Harvey wrote: > > From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org] > > On Behalf Of Will Dennis > > > > We have a research dept here that's looking for a 24-port 10Gbps-per-port > > switch at a good price point. They would like a

Re: [lopsa-tech] Packet shaping appliance

On 5/3/2011 3:58 PM, John Stoffel wrote: > Will> Looking into packet-shaping appliances for our WAN connection > Will> here (100Mbps Metro-Eth)... At a former employer we used > Will> Packeteer, which I see has now been acquired by BlueCoat... It > Will> was a good solution for us (WAN there wa

Re: [lopsa-tech] scp

another vote for rsync, it fits your requirements. (also unison if you need it to work in either direction with the possibility of editing on either side) ___ Tech mailing list Tech@lists.lopsa.org https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech T

Re: [lopsa-tech] scp

On 5/4/2011 8:02 PM, da...@lang.hm wrote: > On Wed, 4 May 2011, Doug Hughes wrote: > >> another vote for rsync, it fits your requirements. (also unison if you >> need it to work in either direction with the possibility of editing on >> either side) > > I don't s

Re: [lopsa-tech] Anyone here do InfiniBand consulting?

On 5/10/2011 12:46 PM, Will Dennis wrote: > Hi all, > > We have a group here that has acquired an InfiniBand switch (a Voltaire > [now Mellanox] Grid Director 4036E to be specific) and the requisite HCA > cards (Mellanox ConnectX-2 dual-port QSFP) and cables. The problem is, > they don't know how t

Re: [lopsa-tech] NAS Recommendations

On 6/14/2011 9:41 AM, Adam Levin wrote: > > On Tue, 14 Jun 2011, Edward Ned Harvey wrote: >> Agreed fully about disbelieving the company line... >> And I would personally choose Oracle/ZFS in nearly every case over the >> Netapp. ;-) > > I'm very excited about ZFS. We've *just* began playing with

Re: [lopsa-tech] NAS Recommendations

On 6/14/2011 2:47 PM, Adam Levin wrote: > > S dedup is not yet mature. But aside from that... > I have heard some anecdotal evidence which I have yet to believe about > data corruption, since I have seen no proof for it. However, Doug even > pointed out some occasional gotchas. So, it's going pl

Re: [lopsa-tech] NAS Recommendations

On 6/14/2011 3:47 PM, Adam Levin wrote: > On Tue, 14 Jun 2011, Doug Hughes wrote: >> That said, zfs is solid, solid, solid for integrity of the data, but >> it's nowhere near as solid for high availability environments as you'd >> get out of a NetApp, BlueArc, or the

Re: [lopsa-tech] NAS Recommendations

On 6/14/2011 10:48 PM, Edward Ned Harvey wrote: >> From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org] >> On Behalf Of Doug Hughes >> >> The glitches that we experience are around the occassional kernel hang >> that requires a machine reset. W

Re: [lopsa-tech] NAS Recommendations

On 6/16/2011 8:19 AM, John Stoffel wrote: > > Ryan> I've done a hot _add_ to a loop without downtime. A shelf > Ryan> _swap_ is not as easy and unless you were REALLY fast on your > Ryan> fingers would require downtime. -rd > > I've been hearing on the toasters mailing list that doing stuff li

Re: [lopsa-tech] NAS Recommendations

responding to excerpts: On 6/16/2011 3:52 PM, Lawrence K. Chen, P.Eng. wrote: > Just to throw out my 2cents... > > We currently have a NetApp 3070? Was purchased quickly when we were having > problems with our NFS cluster (pair of v240's, sol9, vxvm+ufs from > 9980)we eventually resolved th

Re: [lopsa-tech] NAS Recommendations

On 6/17/2011 10:02 AM, Roy McMorran wrote: On 6/16/11 7:25 PM, John Clear wrote: We ran into the same bug with our 7410 cluster. In version (~1 year old), rebuilding a disk caused huge performance impacts, to the point of unresponsiveness. The newer code version has different bugs. The most

Re: [lopsa-tech] NAS Recommendations

On 6/17/2011 3:19 PM, Lawrence K. Chen, P.Eng. wrote: > Forgot to mention earlier that we have 2 now 3 other large zpools in > operation in our datacenter. > > We had originally intended to use PureDisk, we told their professional > services that hardware he was coming out to upgrade our system t

Re: [lopsa-tech] NAS Recommendations

On 6/18/2011 3:11 PM, l...@prgmr.com wrote: > On Fri, Jun 17, 2011 at 03:29:04PM -0400, Doug Hughes wrote: >> I just learned about this today. It's a JBOD, so perfect for a big >> zpool, highly dense, and should be easy to maintain. It's remarkably >> similar to a DD

Re: [lopsa-tech] Lets talk about your favorite 1U Compute Servers

On 7/15/2011 7:52 AM, Patrick Cable wrote: Hi list, I'm thinking about buying some (20) Silicon Mechanics Rackform iServ R308.v2 compute boxes for my EDA apps compute grid. They'd be running RHEL5. I'd probably get them with an X5660 and 48gb of ram. Not too worried about dual power supplies, si

Re: [lopsa-tech] Lets talk about your favorite 1U Compute Servers

On 7/18/2011 1:41 PM, Atom Powers wrote: Xeon vs Opteron? The Xeon 5600 series is either 4-core or 6-core. The Opteron 6100 series is either 8-core or 12-core. It would seem that the Opteron is the better compute server, especially since most SuperMicro chipsets support 50% more memory in the O

[lopsa-tech] best fiber management for APC racks

Anybody have recommendations for the best fiber management they've used, or even seen, for APC style netshelter racks? We have an opportunity to redo a main fiber switch so if there's a product you like, I'd love to hear about it. (at a basic level, things like the APC AR8443A are a starting p

Re: [lopsa-tech] Centralized Switch Management

On 8/3/2011 2:38 PM, Aleksey Tsalolikhin wrote: RANCID might help too. Brent has a great summary of it at http://www.netomata.com/blog/brent_chapman/2010/03/26/120 We use rancid quite a bit, and my last company (major network provider) did too. We added a bunch of force10 support to it and sub

Re: [lopsa-tech] Poor NFS performace from CentOS5 client to Oracle (Sun) Unified Storage NAS

On 8/19/2011 8:49 PM, br...@atkisson.net wrote: On 8/19/11 8:04 PM, Patrick M. Landry wrote: *From: *"Alexander J. Maidak" *To: *"Patrick M. Landry" *Cc: *tech@lists.lopsa.org *Sent: *Wednesday, August

Re: [lopsa-tech] Poor NFS performace from CentOS5 client to Oracle (Sun) Unified Storage NAS

On 8/20/2011 10:03 AM, Edward Ned Harvey wrote: From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org] On Behalf Of Doug Hughes Ah, I think I know exactly what this (above) is. Linux (CentOS) does not fully implement the READDIRPLUS NFS RPC call, but Solaris does. When the

Re: [lopsa-tech] Environmental/Alarm/Dry Circuit monitoring?

I've used sensaphone for this but im not sure it fits your cost target. Also emerson/liebert opencomms EM. On Aug 30, 2011 2:25 PM, "Ted Cabeen" wrote: ___ Tech mailing list Tech@lists.lopsa.org https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This

Re: [lopsa-tech] configuration files

On 9/1/2011 9:08 AM, Andrew Hume wrote: think of this as a sort of survey. i am building a distributed cluster application which now has two distinct sets of configuration info: a) cluster-wide, shared by all components b) server-specific, shared by components on a single server for now, these a

Re: [lopsa-tech] Telco rack cable organizers

You should talk to chatsworth about their evolution product line for 2 post racks. Good stuff. On Sep 15, 2011 6:47 PM, "Will Dennis" wrote: > Hi all, > > Where's a good place to get vertical cable rings for 2-post telco racks > (round threaded holes)? This is the kind of thing I'm talking about:

Re: [lopsa-tech] SSD RAID or Drive Recommendation ?

On 9/16/2011 2:07 PM, da...@lang.hm wrote: On Fri, 16 Sep 2011, Liyun Yu wrote: Anyone used the OWC (other world computing) SSD (6G) for RAID Array? Any suggestions/recommendations on SSD based RAID on the market or drives good for RAID ? Or any pointers to some reference benchmark? Yes I do ha

Re: [lopsa-tech] SSD RAID or Drive Recommendation ?

On 9/18/2011 8:47 PM, Luke S. Crawford wrote: On Sat, Sep 17, 2011 at 12:17:26AM -0700, Anton Cohen wrote: To sum it up, I'd trust consumer SSDs in my laptop, I'd trust them for L2ARC, I wouldn't trust them as primary storage for critical data like an Oracle database. But not the ZIL, right?

Re: [lopsa-tech] SSD RAID or Drive Recommendation ?

On 9/19/2011 3:33 AM, Luke S. Crawford wrote: The reason I said L2ARC and not ZIL for MLC consumer SSDs has to do with size, performance, and price. The maximum size for the ZIL is about 1/2 RAM, effective size is even smaller, it needs enough to store about 10 seconds worth of writes. It also n

Re: [lopsa-tech] SSD RAID or Drive Recommendation ?

On 9/19/2011 3:34 AM, Luke S. Crawford wrote: On Sun, Sep 18, 2011 at 10:08:08PM -0400, Doug Hughes wrote: On 9/18/2011 8:47 PM, Luke S. Crawford wrote: On Sat, Sep 17, 2011 at 12:17:26AM -0700, Anton Cohen wrote: To sum it up, I'd trust consumer SSDs in my laptop, I'd trust them fo

Re: [lopsa-tech] SSD RAID or Drive Recommendation ?

On 9/19/2011 9:40 AM, Edward Ned Harvey wrote: From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org] On Behalf Of Doug Hughes The biggest WIN for ZIL is NFS workloads with lots of small files and This is also the biggest win, for disabling the ZIL completely. ;-) Also, on

Re: [lopsa-tech] SSD RAID or Drive Recommendation ?

On Sep 20, 2011 8:38 AM, "Edward Ned Harvey" wrote: > > As for mirroring the ZIL: Distrust for a single drive has some truth in it. > If you have a disk failure (including data error) on your unmirrored ZIL > device, which coincides with a system ungraceful crash, then the data on > that device

Re: [lopsa-tech] Internet cop

I have not used it for this but Palo Alto networks firewall can definitely do this sort of thing. It can also monitor the usage of all the services and graph the results. On Oct 13, 2011 10:16 AM, "Jeremy Charles" wrote: > I’ve been directed to figure out how to decrease the amount of Internet >

[lopsa-tech] Fwd: mounting switches backwards? a lot more waste heat

On Thu, Oct 20, 2011 at 3:08 PM, David Bronder wrote: > Luke S. Crawford wrote: > > > > I've been mounting switches backwards forever; I mean, the ports are on > > the back of the servers, right? it only makes sense. Now, normally, > > I put it at the top of the rack and it works fine; excess

[lopsa-tech] VPN remote concentrators

What are people using these days for VPN concentrators? seems like Cisco 3000 series is still out there in force, and very inexpensively available on the aftermarket. Even the 3060 (which was probably state of the art for 2004). vpnc and the broad availability of clients makes them seem like st

Re: [lopsa-tech] VPN remote concentrators

On 10/23/2011 9:34 AM, Edward Ned Harvey wrote: From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org] On Behalf Of Doug Hughes What are people using these days for VPN concentrators? seems like Cisco 3000 series is still out there in force, and very inexpensively available on

Re: [lopsa-tech] temperature probes

On 10/31/2011 2:16 PM, Luke S. Crawford wrote: Hey, so I have a contactless "thermopen" infared thermomiter I got from woot. Figured it'd be neat to see the temperatures of things like hard drives and heat sinks during burn in (sometimes, especially for the hard drives, the SMART reported tempera

Re: [lopsa-tech] RAID for windows

On 1/2/2012 9:12 AM, Edward Ned Harvey wrote: From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org] On Behalf Of 'Luke S. Crawford' Most motherboards nowadays support mirroring. All the dell laptops I've bought in the last 2 years support raid mirroring, and half of them do

Re: [lopsa-tech] STale NFS handle

Many NFS clients, Linux in particular, don't guarantee that the file data is flushed to the server until you do an fsync on it. Close isn't enough. Yeah, this shocked and bothered me as well. Try putting an fsync between your fclose and your mv. It's likely that the data isn't flushed and the k

Re: [lopsa-tech] Recommendation on managed fiber-to-copper meda converter?

We have several that do 100fx on one side and 10/100/1000 on the other. They also have dip switches so that you can use them to tell when the fiber link is down because they will also take down the ethernet. They also use some other mgmt protocol that I haven't looked at in much detail. I think it

Re: [lopsa-tech] Recommendation on managed fiber-to-copper meda converter?

On 1/22/2012 2:52 PM, Jeremy L. Gaddis wrote: * Will Dennis wrote: Yes, I thought of that, but a good managed switch would most probably cost more than a good media converter... And since it's inline to our main Internet connection, I don't want to use a cheap-o switch ;) A switch will be more

Re: [lopsa-tech] Recommendation on managed fiber-to-copper meda converter?

On 1/24/2012 12:54 PM, Sarah Kaye wrote: Coincidentally, I'm looking at a stack of dead Transition Networks fiber-to-copper converters, thinking about switching to a different brand. Do you like Aaxeon's "dumb" converters? Our use is mostly end user, so we don't need management features. 3-

Re: [lopsa-tech] Noise levels in a workspace shared with servers?

You'll pay a pretty penny for them, and it doesn't directly answer your question, but there are a number of rack products that do excellent sound dampening. (confession: I have a small one in my own basement). XrackPro2 is one such; Kell is another. Because of the careful design for noise, there's

Re: [lopsa-tech] Loop detection/prevention.

1) design the network to not have loops (not always possible); use LACP and stacking technologies to provide the redundancy without messing with spanning tree if possible. 2) enable spanning tree. multiple-spanning tree is the latest incarnation and has the most flexibility, but is the hardest to c

Re: [lopsa-tech] Loop detection/prevention.

For our money, the dell (nee force10) are quite good enough and about 1/2 or better the equivalent cisco discounted price. Hp are also decent. On Feb 24, 2012 5:25 PM, "Will Dennis" wrote: > The word "Cheap" does NOT apply to (real) Cisco switches. > > All the "real" Cisco switches (2960 series o

Re: [lopsa-tech] Loop detection/prevention.

On 2/24/2012 9:17 PM, Luke S. Crawford wrote: On Fri, Feb 24, 2012 at 05:59:41PM -0500, Will Dennis wrote: Careful... The "regular" Dell PowerConnect switches (35xx, 55xx, 80xx etc.) != Dell Force10. The PowerConnect line is made of "merchant silicon" (Broadcomm, SuperMicro reference, etc.) and

Re: [lopsa-tech] Loop detection/prevention.

On 2/25/2012 12:33 AM, Luke S. Crawford wrote: We also have had issues with the management capability randomly going away on these, even serial console. That's probably part of the reason they are so inexpensive. Also, they have no L3 capability, they are purely L2 and because it's SFTOS the co

Re: [lopsa-tech] 120v single-phase, 208v split-phase and three-phase in the data center.

On 2/27/2012 7:40 PM, Edward Ned Harvey wrote: Actually... I'm quite sure 120V is a single phase (relative to ground), and 240V are just two 120V circuits that are directly out of phase with each other (2-phase) and 208V is three 120V signals that are each 120deg out of phase with each other. 1

Re: [lopsa-tech] 120v single-phase, 208v split-phase and three-phase in the data center.

On 2/27/2012 8:18 PM, Darrell Fuhriman wrote: utilizing less storage elements, and producing less waste. That is true. Or you can just design a smarter A2D power supply, which efficiently uses the 120V single phase power. I continue to wonder why more data centers don't use -48V DC distributio

Re: [lopsa-tech] 120v single-phase, 208v split-phase and three-phase in the data center.

On Mon, 27 Feb 2012, Luke S. Crawford wrote: I mean, this is at data centers that can handle north of 10Kw of load per rack. It just seems weird to me that I should get 5 20a 120v circuits rather than a smaller number of 3 phase. Am I missing something? or are data centers charging you th

Re: [lopsa-tech] 120v single-phase, 208v split-phase and three-phase in the data center.

Edward Ned Harvey" wrote: > > From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org] > > On Behalf Of Doug Hughes > > > > > I continue to wonder why more data centers don't use -48V DC > > distribution. > > > > > Because it

Re: [lopsa-tech] tcp/ip overhead

PUSH is basically TCP's way of flushing out the data. Because TCP is stream oriented, it's great for throughput, but if you want to say "yo, I've got this bunch of data, and I don't want you to accumulate it into a nice big buffer for protocol efficiency, send it now". The classic example of th

Re: [lopsa-tech] 120v single-phase, 208v split-phase and three-phase in the data center.

On 2/29/2012 7:45 AM, Edward Ned Harvey wrote: From: da...@lang.hm [mailto:da...@lang.hm] Sent: Tuesday, February 28, 2012 6:06 PM currently you take the DC input (solar), run it through an inverter to feed it to a UPS, to convert it to DC (to charge the batteries), to convert back to AC to run

Re: [lopsa-tech] 120v single-phase, 208v split-phase and three-phase in the data center.

On 2/29/2012 12:15 PM, Luke S. Crawford wrote: On Wed, Feb 29, 2012 at 09:10:07AM -0500, Edward Ned Harvey wrote: From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org] On Behalf Of Tracy Reed they currently have to run me 4 20A per rack. Coudldn't they cut that approximately

Re: [lopsa-tech] 120v single-phase, 208v split-phase and three-phase in the data center.

On 2/29/2012 1:19 PM, Anton Cohen wrote: On Wed, Feb 29, 2012 at 9:15 AM, Luke S. Crawford > wrote: The three-phase 208v that coresite santa clara wants to charge me more for? I believe that is three 120v hots, and therefore, rather more power than what I'm

Re: [lopsa-tech] 120v single-phase, 208v split-phase and three-phase in the data center.

On 2/29/2012 1:31 PM, Luke S. Crawford wrote: On Wed, Feb 29, 2012 at 10:19:14AM -0800, Anton Cohen wrote: On Wed, Feb 29, 2012 at 9:15 AM, Luke S. Crawford wrote: The three-phase 208v that coresite santa clara wants to charge me more for? I believe that is three 120v hots, and therefore, rat

Re: [lopsa-tech] infiniband storage performance, odd behaviour

On 3/23/2012 1:01 PM, Conrad Wood wrote: Hi, We currently have 4xQDR infiniband cards& switches as interconnect between storage servers and "workhorses". The storage servers have a mixture of harddisk and ssd. The arrays are split into volumes. They export their volumes via SRP and/or iSer. Bot

Re: [lopsa-tech] infiniband storage performance, odd behaviour

On 3/24/2012 6:42 AM, Conrad Wood wrote: Mostly I wonder if it is atall possible to get such speeds over QDR. Are you in a position where you could perhaps run a "cp" followed by "sync" on an infiniband attached storage system? indeed it is. Many of the larger integrated vendors are moving to

Re: [lopsa-tech] infiniband storage performance, odd behaviour

On 3/26/2012 6:44 AM, Conrad Wood wrote: On Sat, 2012-03-24 at 11:45 -0400, Doug Hughes wrote: On 3/24/2012 6:42 AM, Conrad Wood wrote: Mostly I wonder if it is atall possible to get such speeds over QDR. Are you in a position where you could perhaps run a "cp" followed by &q

Re: [lopsa-tech] How to find files in use by NFS or SAMBA (CIFS)?

On 4/5/2012 4:33 PM, Will Dennis wrote: Thanks, Tom. That explains the lack of NFS results... I did do a: sudo /usr/sbin/lsof | grep "\/home"<< and got a nice list of what files and dir's were in use from smbd. So, with NFS (v3) there's *no* way to tell who's using what from where?? Kind of mak

Re: [lopsa-tech] How to find files in use by NFS or SAMBA (CIFS)?

On 4/5/2012 4:33 PM, Will Dennis wrote: Thanks, Tom. That explains the lack of NFS results... I did do a: sudo /usr/sbin/lsof | grep "\/home"<< and got a nice list of what files and dir's were in use from smbd. So, with NFS (v3) there's *no* way to tell who's using what from where?? Kind of ma

Re: [lopsa-tech] The "Enterprise Apple Laptop"

On 4/6/2012 11:26 AM, Tim Kirby wrote: Much to my surprise and contrary to many years of prior stance to the contrary, a "fast track" project has appeared at $WORK with a view to "supporting" Mac laptops as an alternative to the Dell windows systems - certain area, in particular in engineering, h

Re: [lopsa-tech] VMs

I'll chime in recommending KVM as a good solid performer with wide support. VirtualBox is very cool for a personal machine, but for deployment you are probably better off with KVM. Xen is ok, but with the official dropping of it in RedHat and it's relative slowness for anything I/O related, KVM

Re: [lopsa-tech] Email list to request ticket

If you do end up doing this, I suggest a way to make your ticket system de-duplicate based upon subject. That way, any replies (assuming they keep the same subject) would only generate 1 ticket. On Mon, Jun 4, 2012 at 5:08 PM, Matt Disney wrote: > Front-ending the list with my ticketing system

Re: [lopsa-tech] Neat patch and/or your favorite cable management solution

On 7/11/2012 10:51 AM, Jeff Wasilko wrote: On Tue, Jul 10, 2012 at 09:23:45PM -0700, Gilbert Wilson wrote: I'm building out a new data room and wanted to know if anyone has used neatpatch. http://www.neatpatch.com/ Chatsworth and Middle Atlantic have a myriad of cabling solutions, some of w

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