Questions regarding journal replay
Ralf Hildebrandt
Ralf.Hildebrandt at charite.de
Thu Feb 5 12:58:48 UTC 2009
Today, I had to uncleanly shutdown one of our machines due to an error
in 2.6.28.3. Durin the boot sequence, the ext4 partition /home
experienced a journal replay. /home looks like this:
/dev/mapper/volg1-logv1 on /home type ext4 (rw,noexec,nodev,noatime,errors=remount-ro)
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/volg1-logv1 2,4T 1,4T 1022G 58% /home
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/mapper/volg1-logv1 19519488 8793310 10726178 46% /home
The journal replay too quite a while. About 800 seconds.
# dumpe2fs -h /dev/mapper/volg1-logv1
dumpe2fs 1.41.3 (12-Oct-2008)
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: 032613d3-6035-4872-bc0a-11db92feec5e
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal resize_inode dir_index filetype needs_recovery extent sparse_super large_file uninit_bg
Filesystem flags: signed_directory_hash
Default mount options: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 19519488
Block count: 624605184
Reserved block count: 0
Free blocks: 267655114
Free inodes: 10726118
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 875
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 1024
Inode blocks per group: 32
Filesystem created: Tue May 8 21:04:31 2007
Last mount time: Thu Feb 5 11:08:27 2009
Last write time: Thu Feb 5 11:08:27 2009
Mount count: 12
Maximum mount count: -1
Last checked: Sat Dec 27 23:16:47 2008
Check interval: 0 (<none>)
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
Journal inode: 8
First orphan inode: 17529831
Default directory hash: tea
Directory Hash Seed: 44337061-e542-44bb-afb9-40597ccf1c6d
Journal backup: inode blocks
Journal size: 128M
Questions:
==========
* Why does it take so long?
* What happens during that time?
* Is my journal maybe too big?
--
Ralf Hildebrandt Ralf.Hildebrandt at charite.de
Charite - Universitätsmedizin Berlin Tel. +49 (0)30-450 570-155
Geschäftsbereich IT | Abt. Netzwerk Fax. +49 (0)30-450 570-962
Hindenburgdamm 30 | 12200 Berlin
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