Re: How often should I fsck my ext3 partition?
- From: Brad Sawatzky <brad+debian@xxxxxxxxxxx>
- Date: Wed, 5 Apr 2006 17:45:18 -0400
On Wed, 05 Apr 2006, Mike McCarty wrote:
Ali Milis wrote:[ . . . ]
Johannes Wiedersich wrote:
The debian default of my sarge installations is that the ext3-FS are
fsck'ed about every 30 mounts or 180 days (whatever comes first).
This is just my Euro 0.01 opinion:
180 days is reasonable for new disks.
Perhaps you would like to lower it when your disk goes old.
A related question is how to do it without taking the machine down
uncleanly or fiddling an arcane file somewhere. I've thought about
perhaps doing...
$ mount -o remount -o ro /dev/hda5
$ fsck /dev/hda5
$ mount -o remount -o rw /dev/hda5
(I have /dev/hda5 mounted as / on my machine.) Is there any
exposure in this? I'm pretty leery of running fsck on a
r/w file system.
Running fsck on a r/w file system is a Bad Plan(TM). (I don't think fsck
will even do it without a force flag.)
One convenient option is to use the clock-time based check interval for
ext2/3. For example,
tune2fs -i 60d -c 0
will force a fsck on the first reboot every 60 days (and disable the 'every
n mount-counts' interval).
Regarding Johannes' question about filesystem errors getting rsynced to
backups. Yes, that is very possible (had it happen to me once). You can
greatly reduce the likelihood by using rsync's '--checksum' option, at the
cost of a (much) longer backup time...
-- Brad
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