Software RAID
Hi it has been suggested to me that I configure a server to use software RAID 1, with two IDE drives, to provide a measure of redundancy. I'm dubious. Does anyone have any experience with this sort of arrangement: specifically with the RAID performance and the impact on the server? Yes, this is an attempt to d othings on the cheap :-) Slainte Gordon
Re: Software RAID
On Thu, 2002-05-23 at 20:07, Gordon Findlay wrote: it has been suggested to me that I configure a server to use software RAID 1, with two IDE drives, to provide a measure of redundancy. I'm dubious. Does anyone have any experience with this sort of arrangement: specifically with the RAID performance and the impact on the server? Yes, this is an attempt to d othings on the cheap :-) We just set a server exactly as you describe yesterday, and it performs extremely well, no performance problems at all. In fact the data transfer rate onto a single drive was pretty much identical to the data rate writing to the RAID. Regards, Richard Waid Network/Software Engineer http://iopen.co.nz
Re: Almost converted...
Zane Gilmore wrote: Most of us programmers/geeks love to expound our knowledge ;-) and we definitely need people who are not afraid of asking questions. Because there are often so many ways of solving a problem, all of us often will read answers from others and learn something new, no matter the level of expertise. And now I can have the fun of solving them all over again on my Sony PlayStation 2 with Linux, which is compiling/installing the AbiWord source RPM and I type. My first non-x86 Linux box is already installed, networked, running X and compiling things, so it's not going too badly. Vik :v) -- /\ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . /\ \ / ASCII Ribbon Campaign One of The Olliver Family \ / X - NO HTML/RTF in e-mail http://olliver.family.gen.nzX / \ - NO MSWord docs in e-mail Public PGP key available there / \
Re: stopping spam
now i'd have to say I don't know the answer to that. Porably by getting rid of exchange server?? *brain-throb* Okay - My system here is the firewall portforwards connections on port 25 to a linux box running exim. The linux box then sends the mail to the exchange server via smtp. Outbound mail goes back the same way. Since theres no local delivery - can I use spamassassin ? (the reason for the torturous path is to shield the exchange server against the nasty world, and to use some of the anti-spam features of exim as opposed to ms exchange's attitude of don't hurt me please) -- Nick Rout [EMAIL PROTECTED]
High Speed Internet in....
Title: Message "remote locations", isn't funny what some people class as remote locations, looking at getting high speed internet access (of any description) in Hanmer Springs, I was surprised to find that there are no options at all. ADSL? --- Not supported Frame Relay, which is advertised as available in most areas -- Not available Does anybody have any ideas of what I can do, I find it amazing that a town like Hanmer has not had their exchange upgraded at all. A township that has over 30 motels/hotels alone... must be a candidate for a tech boost. the best connection I have got while up there is 33k --- luckily I live in chch, parents in Hanmer. Anyhow, I welcome any suggestions... apparently there is a wireless option, Telecom are getting back to me, but I suspect that that will be utilising the 027 (CDMA) network, which as well as being ultra expensive, considering I want 24hr connections - I don't trust either being a current 027 customer who has had not too much joy with the system. Strangely enough, Ihug claims that I can get Frame Relay with them (is this an indication about the knowledge of their 'Tech Support'), the cost for Ihug 128k Frame Relay --- only $1100 per month, $500 setup fee, and router $1600. As a side point, what do Cash machines run on? ATM? I guess that may be another solution, I am sure that will come at a cost as well. enough said Adam
RE: Software RAID
Although that is a step in the right direction, why not go to raid 5, whereas data lost from a stripe set without parity (Raid 1) is unrecoverable, unless of course more than one disk in the array fails. You also need at least 3 HDD for Raid 5, but an extra HDD is a very minimal cost. -Original Message- From: Gordon Findlay [mailto:[EMAIL PROTECTED]] Sent: Thursday, 23 May 2002 8:08 p.m. To: [EMAIL PROTECTED] Subject: Software RAID Hi it has been suggested to me that I configure a server to use software RAID 1, with two IDE drives, to provide a measure of redundancy. I'm dubious. Does anyone have any experience with this sort of arrangement: specifically with the RAID performance and the impact on the server? Yes, this is an attempt to d othings on the cheap :-) Slainte Gordon
FW: Software RAID
Sorry, ammendment needed... I lost my sentence half way through... Although that is a step in the right direction, why not go to raid 5, whereas data lost from a stripe set without parity (Raid 1) is unrecoverable, NEW data from a stripe set with parity can usually be recovered, /NEW unless of course more than one disk in the array fails. You also need at least 3 HDD for Raid 5, but an extra HDD is a very minimal cost. -Original Message- From: Gordon Findlay [mailto:[EMAIL PROTECTED]] Sent: Thursday, 23 May 2002 8:08 p.m. To: [EMAIL PROTECTED] Subject: Software RAID Hi it has been suggested to me that I configure a server to use software RAID 1, with two IDE drives, to provide a measure of redundancy. I'm dubious. Does anyone have any experience with this sort of arrangement: specifically with the RAID performance and the impact on the server? Yes, this is an attempt to d othings on the cheap :-) Slainte Gordon
Re: High Speed Internet in....
Adam Martin wrote: Does anybody have any ideas of what I can do, I find it amazing that a town like Hanmer has not had their exchange upgraded at all. A township that has over 30 motels/hotels alone... must be a candidate for a tech boost. the best connection I have got while up there is 33k--- luckily I live in chch, parents in Hanmer. Bring it in on an 802.11 wireless network with directional antennae? Vik :v) -- /\ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . /\ \ / ASCII Ribbon Campaign One of The Olliver Family \ / X - NO HTML/RTF in e-mail http://olliver.family.gen.nzX / \ - NO MSWord docs in e-mail Public PGP key available there / \
RE: High Speed Internet in....
Title: Message IHug Ultra Satellite should be available pretty much anywhere, if you're game to play with Ihug, (worth it if it's the only option) Chris -Original Message-From: Adam Martin [mailto:[EMAIL PROTECTED]]On Behalf Of Adam MartinSent: Thursday, May 23, 2002 23:44To: [EMAIL PROTECTED]Subject: High Speed Internet in "remote locations", isn't funny what some people class as remote locations, looking at getting high speed internet access (of any description) in Hanmer Springs, I was surprised to find that there are no options at all. ADSL? --- Not supported Frame Relay, which is advertised as available in most areas -- Not available Does anybody have any ideas of what I can do, I find it amazing that a town like Hanmer has not had their exchange upgraded at all. A township that has over 30 motels/hotels alone... must be a candidate for a tech boost. the best connection I have got while up there is 33k --- luckily I live in chch, parents in Hanmer. Anyhow, I welcome any suggestions... apparently there is a wireless option, Telecom are getting back to me, but I suspect that that will be utilising the 027 (CDMA) network, which as well as being ultra expensive, considering I want 24hr connections - I don't trust either being a current 027 customer who has had not too much joy with the system. Strangely enough, Ihug claims that I can get Frame Relay with them (is this an indication about the knowledge of their 'Tech Support'), the cost for Ihug 128k Frame Relay --- only $1100 per month, $500 setup fee, and router $1600. As a side point, what do Cash machines run on? ATM? I guess that may be another solution, I am sure that will come at a cost as well. enough said Adam
Re: stopping spam
Yep - thats one thing I'd love to do. But it is apparently impossible to save all the stored crap that all the user accounts have built up. The exchange server is a PIII 450 with 300something Mb ram and a 6 Gb IDE drive, so it would make a fine linux box too. On Thu, 2002-05-23 at 23:09, Nick Rout wrote: now i'd have to say I don't know the answer to that. Porably by getting rid of exchange server?? *brain-throb* Okay - My system here is the firewall portforwards connections on port 25 to a linux box running exim. The linux box then sends the mail to the exchange server via smtp. Outbound mail goes back the same way. Since theres no local delivery - can I use spamassassin ? (the reason for the torturous path is to shield the exchange server against the nasty world, and to use some of the anti-spam features of exim as opposed to ms exchange's attitude of don't hurt me please) -- Nick Rout [EMAIL PROTECTED]
Re: FW: Software RAID
On Thu, 2002-05-23 at 23:47, Adam Martin wrote: Sorry, ammendment needed... I lost my sentence half way through... Although that is a step in the right direction, why not go to raid 5, whereas data lost from a stripe set without parity (Raid 1) is unrecoverable, NEW data from a stripe set with parity can usually be recovered, /NEW unless of course more than one disk in the array fails. You also need at least 3 HDD for Raid 5, but an extra HDD is a very minimal cost. I think you'll find RAID 0 is striping without parity (which makes the 'R' is RAID something of a misnomer), RAID 1 is straight mirroring. Raid 5 is a option if you need a performance increase _and_ redundancy, but Raid 1 has the advantage of simplicity, each drive is actually a mountable drive if another fails. RAID 1 is good for applications where data integrity is important, but without a huge transaction rate. I'd personally _never_ use RAID 0, unless I was actually planning to lose data. A search on google turns up -- http://www.acnc.com/04_01_00.html which looks like an excellent resource. None of this is a substitute for having off-site backups! Best regards, Richard Waid Network/Software Engineer http://iopen.co.nz
Re: High Speed Internet in....
LOL, cash machines running on ATM, I'm sure there was no pun intended, but that made me chuckle :-). The cash machines will be on whatever they can provide in that location, ISDN could be an option, expensive tho', Ihug are a bunch of morons, but their satellite service is probably the only affordable option. jeremyb From: Adam Martin [EMAIL PROTECTED] Date: 2002/05/23 Thu PM 11:44:16 GMT+12:00 To: [EMAIL PROTECTED] Subject: High Speed Internet in As a side point, what do Cash machines run on? ATM? I guess that may be another solution, I am sure that will come at a cost as well. enough said Adam Title: Message "remote locations", isn't funny what some people class as remote locations, looking at getting high speed internet access (of any description) in Hanmer Springs, I was surprised to find that there are no options at all. ADSL? --- Not supported Frame Relay, which is advertised as available in most areas -- Not available Does anybody have any ideas of what I can do, I find it amazing that a town like Hanmer has not had their exchange upgraded at all. A township that has over 30 motels/hotels alone... must be a candidate for a tech boost. the best connection I have got while up there is 33k --- luckily I live in chch, parents in Hanmer. Anyhow, I welcome any suggestions... apparently there is a wireless option, Telecom are getting back to me, but I suspect that that will be utilising the 027 (CDMA) network, which as well as being ultra expensive, considering I want 24hr connections - I don't trust either being a current 027 customer who has had not too much joy with the system. Strangely enough, Ihug claims that I can get Frame Relay with them (is this an indication about the knowledge of their 'Tech Support'), the cost for Ihug 128k Frame Relay --- only $1100 per month, $500 setup fee, and router $1600. As a side point, what do Cash machines run on? ATM? I guess that may be another solution, I am sure that will come at a cost as well. enough said Adam
Re: Software RAID
On Thu, May 23, 2002 at 11:44:27PM +1200, Adam Martin wrote: Although that is a step in the right direction, why not go to raid 5, Because software RAID 5 sucks eggs. Mike. -- Michael Beattie [EMAIL PROTECTED] Contentsofsignaturemaysettleduringshipping.
Re: Re: Software RAID
Does anyone know what levels those ide raid motherboards and adapters you can get these days support and if their is linux drivers yet? could be an option :-) jeremyb. From: Michael Beattie [EMAIL PROTECTED] Date: 2002/05/24 Fri AM 09:33:22 GMT+12:00 To: [EMAIL PROTECTED] Subject: Re: Software RAID On Thu, May 23, 2002 at 11:44:27PM +1200, Adam Martin wrote: Although that is a step in the right direction, why not go to raid 5, Because software RAID 5 sucks eggs. Mike. -- Michael Beattie [EMAIL PROTECTED] Contentsofsignaturemaysettleduringshipping.
Re: FW: Software RAID
On Fri, May 24, 2002 at 09:13:14AM +1200, Richard Waid wrote: I think you'll find RAID 0 is striping without parity (which makes the 'R' is RAID something of a misnomer), RAID 1 is straight mirroring. Raid No matter what variant of RAID you use, I've always seen that the I is not correctly translated too.. *shrug* Mike. -- Michael Beattie [EMAIL PROTECTED] Plug-and-Play is really nice, unfortunately it only works 50% of the time. To be specific the Plug almost always works.--unknown source
Re: Re: Software RAID
Look in the kernel source then find a board that has a supported chipset on it. Promise Fasttrak RAID and Highpoint370 RAID are supported by 2.4.18, dunno about 2.5 On Fri, 2002-05-24 at 09:38, Jeremy Bertenshaw wrote: Does anyone know what levels those ide raid motherboards and adapters you can get these days support and if their is linux drivers yet? could be an option :-) jeremyb. From: Michael Beattie [EMAIL PROTECTED] Date: 2002/05/24 Fri AM 09:33:22 GMT+12:00 To: [EMAIL PROTECTED] Subject: Re: Software RAID On Thu, May 23, 2002 at 11:44:27PM +1200, Adam Martin wrote: Although that is a step in the right direction, why not go to raid 5, Because software RAID 5 sucks eggs. Mike. -- Michael Beattie [EMAIL PROTECTED] Contentsofsignaturemaysettleduringshipping.
Re: Software RAID
As with scsi raid arrays, its not the cost of the card thats the problem, its the cost of N matching drives. I'd imagine that four matching 100Gb drives would be a reasonable start, and thats $2000 worth :-\ On Fri, 2002-05-24 at 10:40, Jeremy Bertenshaw wrote: http://www.tastech.co.nz/ have an ide raid card for $80 in their misc section, I guess if anyone is interested they could enquire about chipset etc. jeremyb.
Re: Re: Software RAID
I was more thinking in terms of them doing a hardware solution cheaply, they obviously have the drives all ready if they are contemplating software raid, so for another $80 they can have a hardware raid card and much better performance (i imagine :-) From: C Falconer [EMAIL PROTECTED] Date: 2002/05/24 Fri AM 11:04:09 GMT+12:00 To: Jeremy Bertenshaw [EMAIL PROTECTED] CC: [EMAIL PROTECTED] [EMAIL PROTECTED] Subject: Re: Software RAID As with scsi raid arrays, its not the cost of the card thats the problem, its the cost of N matching drives. I'd imagine that four matching 100Gb drives would be a reasonable start, and thats $2000 worth :-\ On Fri, 2002-05-24 at 10:40, Jeremy Bertenshaw wrote: http://www.tastech.co.nz/ have an ide raid card for $80 in their misc section, I guess if anyone is interested they could enquire about chipset etc. jeremyb.
Re: High Speed Internet in....
Just wait, see:- http://www.beehive.govt.nz/ViewDocument.cfm?DocumentID=14030 Chris Bayley wrote: IHug Ultra Satellite should be available pretty much anywhere, if you're game to play with Ihug, (worth it if it's the only option) Chris -Original Message- *From:* Adam Martin [mailto:[EMAIL PROTECTED]]*On Behalf Of *Adam Martin *Sent:* Thursday, May 23, 2002 23:44 *To:* [EMAIL PROTECTED] *Subject:* High Speed Internet in remote locations, isn't funny what some people class as remote locations, looking at getting high speed internet access (of any description) in Hanmer Springs, I was surprised to find that there are no options at all. ADSL? --- Not supported Frame Relay, which is advertised as available in most areas -- Not available Does anybody have any ideas of what I can do, I find it amazing that a town like Hanmer has not had their exchange upgraded at all. A township that has over 30 motels/hotels alone... must be a candidate for a tech boost. the best connection I have got while up there is 33k--- luckily I live in chch, parents in Hanmer. Anyhow, I welcome any suggestions... apparently there is a wireless option, Telecom are getting back to me, but I suspect that that will be utilising the 027 (CDMA) network, which as well as being ultra expensive, considering I want 24hr connections - I don't trust either being a current 027 customer who has had not too much joy with the system. Strangely enough, Ihug claims that I can get Frame Relay with them (is this an indication about the knowledge of their 'Tech Support'), the cost for Ihug 128k Frame Relay --- only $1100 per month, $500 setup fee, and router $1600. As a side point, what do Cash machines run on? ATM? I guess that may be another solution, I am sure that will come at a cost as well. enough said Adam
PS2 (Was: Almost converted...)
Quoting Vik Olliver [EMAIL PROTECTED]: And now I can have the fun of solving them all over again on my Sony PlayStation 2 with Linux, which is compiling/installing the AbiWord source RPM and I type. My first non-x86 Linux box is already installed, networked, running X and compiling things, so it's not going too badly. Could you please bring it to the next meeting? It would be interesting to check out. Yuri
Re: High Speed Internet in....
Quoting Jeremy Bertenshaw [EMAIL PROTECTED]: LOL, cash machines running on ATM, I'm sure there was no pun intended, but that made me chuckle :-). The cash machines will be on whatever they can provide in that location, ISDN could be an option, expensive tho', Ihug are a bunch of morons, but their satellite service is probably the only affordable option. cash machines don't need high bandwidth. financial transactions produce traffic in the order of bytes, not megabytes or even kilobytes, just bytes. Yuri de Groot
Re: Almost converted...
Ben Aitchison wrote: On Thu, May 23, 2002 at 09:36:00AM +1200, Zane Gilmore wrote: Most of us programmers/geeks love to expound our knowledge ;-) and we definitely need people who are not afraid of asking questions. Because there are often so many ways of solving a problem, all of us often will read answers from others and learn something new, no matter the level of expertise. The problem that tends to come up though, is that all the easy answers get answered and the complicated problems get ignored. This is a trend in mailing lists in general. I wish I knew an easy answer :) People are prepared to provide answers from their personal knowledge for free, but not do research projects for free. Unfortunately the easy answer is probably summed up in the sentence You get what you pay for. For instance, I want to figure out what country an AS number is in, without doing mass whois querys. Like for instance: % whois -h whois.apnic.net AS9800 Will tell me that that AS number is in China. I'd like to be able to (say) block all of China from accessing my SMTP port for instance. I've got a BGP dump of prefixes to AS numbers, so that I can figure out what IP subnets belong to which AS number. Now this is a challenge to see if anyone has any ideas :P One quite good way of stopping spam is to check the reverse lookup on the DNS. If, as is almost always the case with spam, there is no reverse lookup you can just redirect to /dev/null . It's not 100% proof but together will the other, standard, measures it can be a big help. -- C.
Re: PS2 (Was: Almost converted...)
Could you please bring it to the next meeting? It would be interesting to check out. Yuri U I think Vik lives in Auckland? -- Nick Rout [EMAIL PROTECTED]
Re: PS2 (Was: Almost converted...)
I volunteer to go to Auck and pick it up, then return and demonstrate it at the meeting. On Fri, 2002-05-24 at 13:12, Nick Rout wrote: Could you please bring it to the next meeting? It would be interesting to check out. Yuri U I think Vik lives in Auckland? (note nothing said about returning it afterwards!)
