Thank you Peter! Apparently, use of chchp on any path causes Linux to validate all of the CHPIDs.
Using lscss, I found that many guests still show status like this: Device Subchan. DevType CU Type Use PIM PAM POM CHPIDs ---------------------------------------------------------------------- 0.0.01B0 0.0.000A 3390/0C 3990/E9 yes FF FF FF 444BA0B1 A1B06F4D After chchp -v 0 b1, the output changed to: Device Subchan. DevType CU Type Use PIM PAM POM CHPIDs ---------------------------------------------------------------------- 0.0.01B0 0.0.000A 3390/0C 3990/E9 yes FF E4 FF 444BA0B1 A1B06F4D Linux apparently found that 4 paths are actually offline. This circumvention whould help to avoid the problem we encountered. So, there are 2 issues remaining. 1) Of my 500+ Linux guests, only about 20 had issues that caused file system problems even though all show the issue using lscss. 2) Why doesn't Linux receive and handle pathing issues when they occur? It is not an unusual situation to take DASD paths off and back on. I am not going to pursue this further on the list. I will be opening a Service Request to investigate this further. Rick Barlow Nationwide ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu 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/
