FabricPool Linux SAN host remediation

Applies to

• ONTAP FabricPool
• Linux
  • RHEL
  • SLES
  • Oracle Linux
  • Ubuntu
  • CentOS, etc.
• Filesystems
  • Ext3
  • Ext4
  • XFS
  • Btrfs, etc

Issue

• During ONTAP FabricPool S3 tiering outage, Linux  may report:
  • I/O failures,
  • Read-only filesystems,
  •  Host crash, etc.
• Linux logs records this as medium errors.
• Sample error message from Linux:

Linex FS degraded

2023-07-03T17:29:18.275679+00:00 localhost kernel: [92870.466696][ C19] sd 11:0:1:0: [sdc] tag#1261 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s

2023-07-03T17:29:18.275718+00:00 localhost kernel: [92870.466713][ C19] sd 11:0:1:0: [sdc] tag#1261 Sense Key : Medium Error [current]

2023-07-03T17:29:18.275722+00:00 localhost kernel: [92870.466720][ C19] sd 11:0:1:0: [sdc] tag#1261 Add. Sense: Unrecovered read error - recommend rewrite the data

2023-07-03T17:29:18.275724+00:00 localhost kernel: [92870.466727][ C19] sd 11:0:1:0: [sdc] tag#1261 CDB: Read(10) 28 00 00 5a 01 b8 00 00 20 00

2023-07-03T17:29:18.275725+00:00 localhost kernel: [92870.466732][ C19] blk_update_request: critical medium error, dev sdc, sector 5898680 op 0x0:(READ) flags 0x84700 phys_seg 4 prio class 0

2023-07-03T17:29:18.275728+00:00 localhost kernel: [92870.466751][ C19] blk_update_request: critical medium error, dev dm-3, sector 5898680 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0