On 09.07.2013 13:39, Rick Barlow wrote:
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.
The recommended procedure for performing maintenance on a CHPID looks like this: 1. Vary CHPID off in Linux (chchp -v 0 CHPID) 2. Vary path off in z/VM 3. Vary CHPID off in z/VM 4. Perform maintenance 5. Vary CHPID on in z/VM 6. Vary path on in z/VM 7. Vary CHPID on in Linux (chchp -v 1 CHPID) If necessary, step 7 can be used after the fact to tell Linux to update status information for all paths of all devices using that CHPID. Regards, Peter Oberparleiter -- Peter Oberparleiter Linux on System z Development - IBM Germany ---------------------------------------------------------------------- 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/
