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

[Martin Steigerwald]

Am Dienstag, 10. April 2012 schrieb Stefan Ring:
> > 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

Hmmm, so its not the alignment. xfs_info output looks sane otherwise.

I have no further ideas for now. But others had it seems. (Reading rest of 
new messages in thread.)

Ciao,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7