[mythtv-users] Fragmentation On Recording Disk?
warjamy at yahoo.com
Wed Apr 4 07:31:40 UTC 2007
wow! I need to check this tonight!
It's funny, I thought disk frag was not an issue with linux! guess I was wrong ...
Seriously, are these figures reasonable ? I mean, can one trust what xfs_db spits out ? I never considered checking disk frag on any of my linux boxes, and I've had them for quite a while. Are disks formatted with ext3 showing the same fragmentation factor ? And does one know the growth rate of this factor ? (what are the relevant variables : disk size ? technology ? file system ?)
Ben Lancaster <lists at benlancaster.co.uk> wrote:
On 3 Apr 2007, at 22:30, Robert wrote:
> Michael MacLeod wrote:
>> root at sixball:~# xfs_db -r /dev/mythtv/mythmedia
>> xfs_db> frag
>> actual 3904, ideal 3191, fragmentation factor 18.26%
>> xfs_db> quit
>> I just thought I'd share this with the list, and ask if anyone
>> else has
>> encountered significant performance loss due to disk
>> fragmentation? How
>> fragmented are your drives?
> mythbox ~ # xfs_db -r /dev/mapper/vg-mythtv
> xfs_db> frag
> actual 60667, ideal 67, fragmentation factor 99.89%
> Hmm, that looks pretty bad.
# /usr/local/bin/xfs_db -r -c frag /dev/sda6
actual 940233, ideal 585, fragmentation factor 99.94%
I'd say that's worse!
FWIW, looks like xfs_db that ships with xfsprogs.x86_64 (2.7.3-1.2.1)
is b0rked - mine segfaults. Fix: download source packages for
xfsprogs and xfsdump from http://oss.sgi.com/projects/xfs/
download.html and configure/make/make install
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