Re: XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?)

Stefan Ring
2012-04-10T14:02:42Z

> And is XFS aligned to the RAID 6?
>
> What does xfs_info display on it?

Yes, it’s aligned.

meta-data=/dev/mapper/vg_data-lvhome isize=256 agcount=4,
agsize=73233656 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=292934624, imaxpct=5
= sunit=8 swidth=32 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal bsize=4096 blocks=143040, version=2
= sectsz=512 sunit=8 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0

I changed the stripe size to 32kb in the meantime. This way, it
performs slightly better.