Loss of disk access after smartpqi driver resets scsi bus; results in "Medium access timeout failure. Offlining disk!",

Issue

• smartpqi driver logs following, offlined disk is no longer accessible

  Jan  6 01:50:48 hostname kernel: smartpqi 0000:5c:00.0: resetting scsi 14:1:0:1
  Jan  6 01:50:48 hostname kernel: smartpqi 0000:5c:00.0: reset of scsi 14:1:0:1: SUCCESS
  Jan  6 01:50:48 hostname kernel: sd 14:1:0:1: [sdb] Medium access timeout failure. Offlining disk!
  Jan  6 01:50:48 hostname kernel: sd 14:1:0:1: Device offlined - not ready after error recovery
  :
  

• Why did a device which is in a hardware RAID1 stopped being accessible when one leg of the RAID had a failure?

• After one of the legs in a hardware RAID1 got a failure, the corresponding device on the system wasn't accessible anymore

• An error in one leg of a hardware RAID1 should be transparent to the operating system, why did the device stop being accessible?

  Jun  4 06:02:08 localhost kernel: smartpqi 0000:12:00.0: resetting scsi 1:1:0:2
  Jun  4 06:02:08 localhost kernel: smartpqi 0000:12:00.0: reset of scsi 1:1:0:2: SUCCESS
  Jun  4 06:02:08 localhost kernel: sd 1:1:0:2: [sdc] Medium access timeout failure. Offlining disk!
  Jun  4 06:02:08 localhost kernel: sd 1:1:0:2: Device offlined - not ready after error recovery
  :
  Jun  4 06:02:10 localhost kernel: XFS (sdc1): metadata I/O error: block 0x6fd0f0d0 ("xlog_iodone") error 5 numblks 64
  Jun  4 06:02:10 localhost kernel: XFS (sdc1): xfs_do_force_shutdown(0x2) called from line 1200 of file fs/xfs/xfs_log.c.  Return address = 0xffffffffc02f7ea0
  Jun  4 06:02:10 localhost kernel: XFS (sdc1): Log I/O Error Detected.  Shutting down filesystem
  Jun  4 06:02:10 localhost kernel: XFS (sdc1): Please umount the filesystem and rectify the problem(s)
  

• RAID controllers having devices go offline for no apparent reason.

• After a command timeout a smartpqi device is offlined after the driver performs a reset
• After command timeout smartpqi provided device is offlined after drivers eh performs a reset.