[Bug 619012] Re: Parallel fsck is very slow with multiple partitions on one drive

[Steve Langasek]

Johan, I see that you were the author of the mountall code to use ioprio
to prioritize the fsck runs.  Can you comment on why this wouldn't have
been working for Ivan?

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Title:
  Parallel fsck is very slow with multiple partitions on one drive

Status in “mountall” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: mountall

  Before 10.04, Ubuntu fsck'ed every partition serially.  In 10.04,
  multiple partitions on one drive are fscked in parallel.  The change
  was made in:

  https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/491389

  I have three ext4 partitions on a 640GB drive, which I fsck on every
  boot.  This used to take ~1 minute, because ext4 fsck is very fast.
  In 10.04, it takes about 10 minutes.  I don't think the "set their
  priorities so that thrashing is avoided" solution mentioned in the
  above bug is adequate (if it's working at all).  Please disable the
  parallelism for multiple partitions, or make it obvious how to do so.

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