On Thu, Feb 03, 2005 at 04:50:34PM -0800, David Sparks wrote:
> I'm setting up a SAN with a 1TB partition and am seeking some advice.
>
> Previously when setting up servers, I would specify options to mkfs.xfs
> to lower the agcount and create a 32m log, ie for a 33GB partition:
>
> mkfs.xfs -d agcount=32 -l size=32m /dev/sda3
>
> This was based on an article I read at:
>
> http://www-106.ibm.com/developerworks/linux/library/l-fs10.html
Aha, thats whos been telling people that! The article is a bit
out of date now.
> More recently I've not bothered with those options because I read
> somewhere that the defaults are sane. (I've never noticed any
> difference either way) Are the mkfs.xfs defaults good for a 1TB partition?
Yes, should be just fine. In fact, from a quick check, current
mkfs will create a 32 AG filesystem on a 1Terabyte device...
# mkfs.xfs -N -dfile,size=1t,name=/dev/null
meta-data=/dev/null isize=256 agcount=32, agsize=8388608 blks
= sectsz=512
data = bsize=4096 blocks=268435456, imaxpct=25
= sunit=0 swidth=0 blks, unwritten=1
naming =version 2 bsize=4096
log =internal log bsize=4096 blocks=32768, version=1
= sectsz=512 sunit=0 blks
realtime =none extsz=65536 blocks=0, rtextents=0
cheers.
--
Nathan
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