This may not be of much help, but.... In our non mainframe environment where we present NAS as SCSI, our filesystems drop into read only when they experience time outs due to dasd controller performance and contention issues, or underlying netiwork issues. You can see it in the kernel message ring buffer. Perhaps you are experiencing similar problems with your new disk subsystem?
On Tue, Jul 9, 2013 at 7:39 AM, Rick Barlow <[email protected]> wrote: > As far as I know, zHPF is disabled. However, I do not know how to confirm > that. > > We have 8 FICON paths to the DASD subsystem shared through switches to 2 > z196 machines each having 8 FICON paths to the switches. Of the 8 paths, 4 > have been offline from all 8 LPARs for a couple of months while we waited > for IODF changes and physical cabling changes to move those 4 paths from > old switches to newer switches. Last evening, I varied on the 4 paths that > were moved to all 8 LPARs and verified that they were online to the DASD. > I only spot checked the paths and not all 1800 volumes. After I confirmed > that all 8 paths were online to the DASD, I took the other 4 paths > offline. Shortly after that, the small subset of Linux guests began having > problems. We only saw issues on about 20 of over 500 Linux guests. > > I am going to open a PMR and find out how to capture documentation to > better understand what is happening. > > Thank you to all who suggested possible solutions. > > Rick Barlow > > ---------------------------------------------------------------------- > 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 more information on Linux on System z, visit > http://wiki.linuxvm.org/ > ---------------------------------------------------------------------- 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 more information on Linux on System z, visit http://wiki.linuxvm.org/
