Issue

• Varying CHPID using "CP VARY" flipped filesystem on the z/VM Linux guest as "read only". Path that were offline were brought online and then the devices that were online previously were offlined for maintenance.

  Following message were seen in the logs

Jul  8 20:41:02 XXXXXXXXX kernel: dasd-eckd 0.0.01b5: ERP 000000007ff7eef0 has run out of retries and failed
Jul  8 20:41:02 XXXXXXXXX kernel: dasd(eckd): I/O status report for device 0.0.01b5:
Jul  8 20:41:02 XXXXXXXXX kernel: <3>dasd(eckd): in req: 000000007ff7eef0 CC:03 FC:04 AC:20 SC:07 DS:00 CS:00 RC:0
Jul  8 20:41:02 XXXXXXXXX kernel: <3>dasd(eckd): device 0.0.01b5: Failing CCW: 000000007ff7eff8
Jul  8 20:41:02 XXXXXXXXX kernel: <3>dasd(eckd): SORRY - NO VALID SENSE AVAILABLE
Jul  8 20:41:02 XXXXXXXXX kernel: dasd(eckd): Related CP in req: 000000007ff7eef0
Jul  8 20:41:02 XXXXXXXXX kernel: <3>dasd(eckd): CCW 000000007ff7eff0: 03400000 00000000 DAT:
Jul  8 20:41:02 XXXXXXXXX kernel: <3>dasd(eckd): CCW 000000007ff7eff8: 08000000 7FF93E38 DAT:
Jul  8 20:41:02 XXXXXXXXX kernel: dasd-eckd 0.0.01b5: ERP failed for the DASD
Jul  8 20:41:02 XXXXXXXXX kernel: dasd(eckd): I/O status report for device 0.0.01b5:
Jul  8 20:41:02 XXXXXXXXX kernel: <3>dasd(eckd): in req: 000000007ff93d38 CC:03 FC:04 AC:20 SC:07 DS:00 CS:00 RC:0
Jul  8 20:41:02 XXXXXXXXX kernel: <3>dasd(eckd): device 0.0.01b5: Failing CCW: 000000007ff93e40
Jul  8 20:41:02 XXXXXXXXX kernel: <3>dasd(eckd): SORRY - NO VALID SENSE AVAILABLE
Jul  8 20:41:02 XXXXXXXXX kernel: dasd(eckd): Related CP in req: 000000007ff93d38
Jul  8 20:41:02 XXXXXXXXX kernel: <3>dasd(eckd): CCW 000000007ff93e38: E7400040 7FF93E48 DAT:  01805500 09000000  00000000 80c01000  00000000 00bb0000  00bb0000 00000000
Jul  8 20:41:02 XXXXXXXXX kernel: <3>dasd(eckd): CCW 000000007ff93e40: A5041000 7FF93E88 DAT:  a0811ac6 52050000  4f369651 0191d951  ee7ca250 00000000  18010100 08000000
Jul  8 20:41:02 XXXXXXXXX kernel: end_request: I/O error, dev dasdf, sector 269336
Jul  8 20:41:02 XXXXXXXXX kernel: Aborting journal on device dm-6-8. 

• What is the procedure for varying paths when Red Hat Enterprise Linux 6 is used as a guest