[Bug 1308423] Re: race between mdadm and scsi scan

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: mdadm (Ubuntu)
       Status: New => Confirmed

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Title:
  race between mdadm and scsi scan

Status in “mdadm” package in Ubuntu:
  Confirmed

Bug description:
  This brings back memories of the venerable old bug #75681

  We're booting precise systems with the linux-image-generic-lts-saucy
  kernel (3.11, as you'll see in the attached boot log), and have some
  specialised SSD devices we RAID together to form a single block
  device.  Unfortunately, the md autodetection and assembly seems to
  happen before all of these devices have reported in, causing a halted
  boot sitting at a busybox prompt (not fun for servers!)

  As a workaround, we set scsi_mod.scan=sync in the kernel boot options,
  which makes boot block on the scsi scan.  I'm not sure that's the best
  solution, but it felt the most appropriate at the time!

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