Re: Temporary disruption to channel paths - impact on z/Linux?
Stephen Frazier wrote: I would vary the paths offline, swap the card, and vary the paths online. May not be necessary but it might. No need to do anything to the linux guests, that's what VM is for. That worked fine. We varied off the paths and the chpids, swapped the card and then varied all back on. I had 'top' running on all linux terminal sessions. There was no disruption. Thanks for the help. [EMAIL PROTECTED] wrote: We have a problem in our disk array. One of the ficon channel controller cards is down. Our ops wants to swap it today. This will require downing 3 channel paths out of 6 that are shared to z/VM. In the past, I have always shutdown all Linux instances and z/VM and brought it back after the card swap. If three out of the six are suddenly unavailable, would z/VM ignore them and use the only three that are available? When all the six are available when both cards are functioning, will z/VM auto-detect and use the channels? Would this all be transparent to the Linux guests? Apparently this is not an issue on the z/OS side. -- __ Ranga Nathan Work: 714-442-7591 -- Stephen Frazier Information Technology Unit Oklahoma Department of Corrections 3400 Martin Luther King Oklahoma City, Ok, 73111-4298 Tel.: (405) 425-2549 Fax: (405) 425-2554 Pager: (405) 690-1828 email: stevef%doc.state.ok.us -- 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 -- __ Ranga Nathan Work: 714-442-7591 -- 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 begin:vcard fn:Ranga Nathan n:Nathan;Ranga email;internet:[EMAIL PROTECTED] tel;work:714-442-7591 version:2.1 end:vcard
Re: Temporary disruption to channel paths - impact on z/Linux?
VM doesn't shield from Linux that there is 6 paths available, but Linux sees them, too. I.e. if you vary CHPIDs offline the guest Linux will also see them disappear. But you are also on the safe side with Linux as we can handle channel outages, no matter if running under VM or LPAR. Assuring such is part of a rigid device qualification program :-) Linux on 390 Port wrote on 18.02.2006 02:45:22: > I would vary the paths offline, swap the card, and vary the paths online. May > not be necessary but it might. No need to do anything to the linux guests, > that's what VM is for. > > [EMAIL PROTECTED] wrote: > > > We have a problem in our disk array. One of the ficon channel controller > > cards is down. Our ops wants to swap it today. This will require downing > > 3 channel paths out of 6 that are shared to z/VM. > > > > In the past, I have always shutdown all Linux instances and z/VM and > > brought it back after the card swap. > > > > If three out of the six are suddenly unavailable, would z/VM ignore them > > and use the only three that are available? When all the six are > > available when both cards are functioning, will z/VM auto-detect and use > > the channels? > > > > Would this all be transparent to the Linux guests? > > > > Apparently this is not an issue on the z/OS side. > > > > -- > > __ > > Ranga Nathan > > Work: 714-442-7591 > > -- > Stephen Frazier > Information Technology Unit > Oklahoma Department of Corrections > 3400 Martin Luther King > Oklahoma City, Ok, 73111-4298 > Tel.: (405) 425-2549 > Fax: (405) 425-2554 > Pager: (405) 690-1828 > email: stevef%doc.state.ok.us > > -- > 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 Mit freundlichem Gruß / Best regards, Ingo Adlung -- 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: Temporary disruption to channel paths - impact on z/Linux?
Ingo Adlung wrote: VM doesn't shield from Linux that there is 6 paths available, but Linux sees them, too. I.e. if you vary CHPIDs offline the guest Linux will also see them disappear. But you are also on the safe side with Linux as we can handle channel outages, no matter if running under VM or LPAR. Assuring such is part of a rigid device qualification program :-) That is nice to know. However when we swapped cards some time ago when Linux was running on bare metal, we had problems. Perhaps we did not vary off the channel on the linux lpar before we swapped the cards? Linux on 390 Port wrote on 18.02.2006 02:45:22: I would vary the paths offline, swap the card, and vary the paths online. May not be necessary but it might. No need to do anything to the linux guests, that's what VM is for. [EMAIL PROTECTED] wrote: We have a problem in our disk array. One of the ficon channel controller cards is down. Our ops wants to swap it today. This will require downing 3 channel paths out of 6 that are shared to z/VM. In the past, I have always shutdown all Linux instances and z/VM and brought it back after the card swap. If three out of the six are suddenly unavailable, would z/VM ignore them and use the only three that are available? When all the six are available when both cards are functioning, will z/VM auto-detect and use the channels? Would this all be transparent to the Linux guests? Apparently this is not an issue on the z/OS side. -- __ Ranga Nathan Work: 714-442-7591 -- Stephen Frazier Information Technology Unit Oklahoma Department of Corrections 3400 Martin Luther King Oklahoma City, Ok, 73111-4298 Tel.: (405) 425-2549 Fax: (405) 425-2554 Pager: (405) 690-1828 email: stevef%doc.state.ok.us -- 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 Mit freundlichem Gruß / Best regards, Ingo Adlung -- 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 -- __ Ranga Nathan Work: 714-442-7591 -- 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 begin:vcard fn:Ranga Nathan n:Nathan;Ranga email;internet:[EMAIL PROTECTED] tel;work:714-442-7591 version:2.1 end:vcard
