Re: Using VSWITCH and OSA
When you run something like SAP under Linux, a little bit more storage for the network driver isn't an issue :-) All the Best Mark Perry -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Mark Post Sent: 15 December 2004 22:26 To: [EMAIL PROTECTED] Subject: Re: Using VSWITCH and OSA Plus, if you have two network interfaces on each guest, that doubles the amount of real storage that gets used (and _fixed_) by the network driver. The number of pages that get fixed is configurable, but then that's just one more thing to have to do for each guest. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of Michael MacIsaac Sent: Wednesday, December 15, 2004 12:02 PM To: [EMAIL PROTECTED] Subject: Re: Using VSWITCH and OSA If you have two OSA cards why would you want to use VSWITCH High Availability rather than a full network High Availability solution? Because it's a *lot* easier to configure? Mike MacIsaac [EMAIL PROTECTED] (845) 433-7061 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Using VSWITCH and OSA
You missed the point about the pages being fixed. If you have a number of guests doing that, it limits CP's ability to page stuff out. Things can go downhill rapidly at some point. Also, I've seen guests that were just barely undersized taking up 100% of a processor when another NIC was added to it, due to kswapd trying to deal with too little available storage. It is most definitely a disadvantage that needs to be taken into account. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of Mark Perry Sent: Thursday, December 16, 2004 6:32 AM To: [EMAIL PROTECTED] Subject: Re: Using VSWITCH and OSA When you run something like SAP under Linux, a little bit more storage for the network driver isn't an issue :-) All the Best Mark Perry -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Mark Post Sent: 15 December 2004 22:26 To: [EMAIL PROTECTED] Subject: Re: Using VSWITCH and OSA Plus, if you have two network interfaces on each guest, that doubles the amount of real storage that gets used (and _fixed_) by the network driver. The number of pages that get fixed is configurable, but then that's just one more thing to have to do for each guest. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of Michael MacIsaac Sent: Wednesday, December 15, 2004 12:02 PM To: [EMAIL PROTECTED] Subject: Re: Using VSWITCH and OSA If you have two OSA cards why would you want to use VSWITCH High Availability rather than a full network High Availability solution? Because it's a *lot* easier to configure? Mike MacIsaac [EMAIL PROTECTED] (845) 433-7061 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Using VSWITCH and OSA
Hi, Tobias, While I don't know the answer to your question, let me take a stab at what I think you maybe asking. The failover for the VSWITCH if the OSA connection goes down is handled by the VSWITCH and specifically the TCPIP Controller. So whether or not the two OSAs communication with BPDU does not affect how the failover situation is determined. I'm sure if this is where you were going with your question or not but hopefully it helped. Tracy Bolinda [EMAIL PROTECTED] Tracy J Bolinda/Endicott/[EMAIL PROTECTED] z/VM CP Development phone: 607-429-5469 tie line: 620-5469 Tobias Doerkes [EMAIL PROTECTED] Sent by: Linux on 390 Port [EMAIL PROTECTED] 12/15/2004 05:09 AM Please respond to Linux on 390 Port To [EMAIL PROTECTED] cc Subject Using VSWITCH and OSA Hi list, we want to start using VSWITCH with external connection via OSA. So i took the Redpaper REDP-3719-00 VSWITCH and VLAN Features of z/VM 4.4 and started reading and testing. But in the High-Availability chapter there is following note: -- note -- Important: Only one port is used for communication between the VSWITCH and the LAN at any one time. Additional ports defined for the VSWITCH are not connected until required. This means that your backup ports can be in use on other guests, or on other VSWITCHes. -- note -- Question : I want to connect 2 OSA to my VSWITCH. Do the 2 OSA communicate via any LAYER-2 protocol (e.g. BPDU)? Regards, Tobias Doerkes -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Using VSWITCH and OSA
On Wednesday, 12/15/2004 at 10:09 GMT, Tobias Doerkes [EMAIL PROTECTED] wrote: Question : I want to connect 2 OSA to my VSWITCH. Do the 2 OSA communicate via any LAYER-2 protocol (e.g. BPDU)? No, they do not communicate. There is no load balancing or link aggregation, either. When the current OSA fails, the other OSA will be used. Alan Altmark z/VM Development IBM Endicott -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Using VSWITCH and OSA
[EMAIL PROTECTED] wrote: -- note -- This means that your backup ports can be in use on other guests, or on other VSWITCHes. -- note -- My question to this is, in the following scenario (which are some query commands on our v5.1 system), how can OSA 0A00 be used elsewhere if it needs to be attached to the VSWITCH as a BACKUP? VSWITCH SYSTEM VSW1 Type: VSWITCH Connected: 4Maxconn: INFINITE PERSISTENT RESTRICTEDNONROUTER Accounting: OFF VLAN Unaware State: Ready IPTimeout: 5 QueueStorage: 8 Portname: UNASSIGNED RDEV: 0800 Controller: VSWCTRL1 VDEV: 0800 Portname: UNASSIGNED RDEV: 0A00 Controller: VSWCTRL1 VDEV: 0A00 BACKUP q 800-802 OSA 0800 ATTACHED TO VSWCTRL1 0800 OSA 0801 ATTACHED TO VSWCTRL1 0801 OSA 0802 ATTACHED TO VSWCTRL1 0802 q a00-a02 OSA 0A00 ATTACHED TO VSWCTRL1 0A00 OSA 0A01 ATTACHED TO VSWCTRL1 0A01 OSA 0A02 ATTACHED TO VSWCTRL1 0A02 In other words, if 0800 were to fail, the VSWITCH would switch to 0A00 automatically (we've tested this successfully). If 0A00 were not attached to the VSWITCH, would the VSWITCH controller be able to detach it from whatever it was attached too, attach it to the VSWITCH and then switch from the failing OSA 0800 to 0A00? If not, how can something else use this OSA if it is already attached to the VSWITCH as a backup? Mark Wiggins University of Connecticut Operating Systems Programmer 860-486-2792 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Using VSWITCH and OSA
On Wednesday, 12/15/2004 at 11:05 EST, Wiggins, Mark [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: -- note -- This means that your backup ports can be in use on other guests, or on other VSWITCHes. -- note -- My question to this is, in the following scenario (which are some query commands on our v5.1 system), how can OSA 0A00 be used elsewhere if it needs to be attached to the VSWITCH as a BACKUP? z/VM 5.1 and 4.4 work differently in this regard. In 5.1 they are pre-ATTACHed to the controllers so that (a) you can't accidentally or intentionally use them for something else, and (b) we can recover from errors a lot faster. In either case, your backup ports MUST NOT be used for other purposes. You can use other subchannels on the same OSA chpid (port), but not the ones defined for use by the VSWITCH. In 5.1 we make it harder for you to break the rule. In 4.4 it is up to you. Alan Altmark z/VM Development IBM Endicott -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Using VSWITCH and OSA
The single VSWITCH solution requires that both OSA's are in the same subnet, right? And hence the same gateway? Yes Must be some more limitations I can think of (Multipath workload balancing I already mentioned) I can't think of any, but I'll defer to the networking gurus on the list. Mike MacIsaac [EMAIL PROTECTED] (845) 433-7061 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Using VSWITCH and OSA
Hi Tobias, This is not an answer exactly more of a question. If you have two OSA cards why would you want to use VSWITCH High Availability rather than a full network High Availability solution? What I mean is why not use two VSWITCHes each connected to its own OSA in a standard manner, and use a routing protocol such as OSPF (For Linux that's Quagga/Zebra) to handle network path outages. That is typically what we use for SAP R/3 environments. A solution such as OSPF also opens up possibilities such as workload balancing over multiple paths etc. All the Best Mark Perry -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Tobias Doerkes Sent: 15 December 2004 11:09 To: [EMAIL PROTECTED] Subject: Using VSWITCH and OSA Hi list, we want to start using VSWITCH with external connection via OSA. So i took the Redpaper REDP-3719-00 VSWITCH and VLAN Features of z/VM 4.4 and started reading and testing. But in the High-Availability chapter there is following note: -- note -- Important: Only one port is used for communication between the VSWITCH and the LAN at any one time. Additional ports defined for the VSWITCH are not connected until required. This means that your backup ports can be in use on other guests, or on other VSWITCHes. -- note -- Question : I want to connect 2 OSA to my VSWITCH. Do the 2 OSA communicate via any LAYER-2 protocol (e.g. BPDU)? Regards, Tobias Doerkes -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Using VSWITCH and OSA
If you have two OSA cards why would you want to use VSWITCH High Availability rather than a full network High Availability solution? Because it's a *lot* easier to configure? Mike MacIsaac [EMAIL PROTECTED] (845) 433-7061 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Using VSWITCH and OSA
Hi Mike, Sure, can't argue with that ;-) Let me try The single VSWITCH solution requires that both OSA's are in the same subnet, right? And hence the same gateway? Must be some more limitations I can think of (Multipath workload balancing I already mentioned) All the Best Mark Perry -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Michael MacIsaac Sent: 15 December 2004 18:02 To: [EMAIL PROTECTED] Subject: Re: Using VSWITCH and OSA If you have two OSA cards why would you want to use VSWITCH High Availability rather than a full network High Availability solution? Because it's a *lot* easier to configure? Mike MacIsaac [EMAIL PROTECTED] (845) 433-7061 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Using VSWITCH and OSA
VSWITCH looks a lot (to me) like bridged ethernet in VMware. Seems worthwhile to draw accurate comparisons for the sake of understanding one or the other or both. This would make a good topic for FreeVM-L. -- R; -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Using VSWITCH and OSA
Plus, if you have two network interfaces on each guest, that doubles the amount of real storage that gets used (and _fixed_) by the network driver. The number of pages that get fixed is configurable, but then that's just one more thing to have to do for each guest. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of Michael MacIsaac Sent: Wednesday, December 15, 2004 12:02 PM To: [EMAIL PROTECTED] Subject: Re: Using VSWITCH and OSA If you have two OSA cards why would you want to use VSWITCH High Availability rather than a full network High Availability solution? Because it's a *lot* easier to configure? Mike MacIsaac [EMAIL PROTECTED] (845) 433-7061 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
