[Bug 817485] Re: btrfs raid1 is slow at boot

[turbooster]

** Description changed:

- When running natty from a 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
- EOL in fstab and removing ureadahead) the time for boot is 18 seconds.
- It looks like ureadahead is reading from one disk only - maybe this is
- an additional bug.
+ 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.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: btrfs-tools 0.19+20100601-3ubuntu2
  ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
  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)
  ProcEnviron:
-  LANGUAGE=de:en
-  LANG=de_DE.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=de:en
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
  SourcePackage: btrfs-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

** Description changed:

- 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.
+ 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 2.6.38.7
  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)
  ProcEnviron:
   LANGUAGE=de:en
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: btrfs-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/817485

Title:
  btrfs raid1 is slow at boot

Status in “btrfs-tools” package in Ubuntu:
  New

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 2.6.38.7
  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)
  ProcEnviron:
   LANGUAGE=de:en
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: btrfs-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

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