btrfs raid1 is slow at boot

Bug #817485 reported by turbooster
This bug affects 2 people
Affects Status Importance Assigned to Milestone
btrfs-tools (Ubuntu)

Bug Description

When running natty from a btrfs raid1 on a notebook (a small mlc ssd and one partition of a normal hdd) the normal boots takes over 1 minute. fsck and ureadahead take most of the time. When both are disabled (setting 0 at the end of the line in fstab and uninstalling ureadahead) the time for boot is 18 seconds. It looks like ureadahead is reading from one disk only - maybe this is another bug.
I consider this a bug because fsck.btrfs shouldn't take more than 20 seconds to basically do nothing. Isn't btrfs supposed to run without fsck anyway?

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: btrfs-tools 0.19+20100601-3ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic
Uname: Linux 2.6.38-10-generic x86_64
Architecture: amd64
Date: Thu Jul 28 09:39:55 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
SourcePackage: btrfs-tools
UpgradeStatus: No upgrade log present (probably fresh install)

Revision history for this message
turbooster (comacritter) wrote :
Revision history for this message
turbooster (comacritter) wrote :

I haven't tried to only disable fsck. Disabling ureadahead still let's fsck take a long time

turbooster (comacritter)
description: updated
description: updated
Revision history for this message
Launchpad Janitor (janitor) wrote :

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

Changed in btrfs-tools (Ubuntu):
status: New → Confirmed
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