Justin Piszcz wrote:
> Hi,
>
> I was wondering if the XFS folks can recommend any optimizations for high
> speed disk arrays using RAID5?
>
> As well as if there is anything else I can do on the MD side?
>
> fs.xfs.restrict_chown = 1
> fs.xfs.irix_sgid_inherit = 0
> fs.xfs.irix_symlink_mode = 0
OT but...
/me wonders if some of these could go away by now... :)
-Eric
> fs.xfs.panic_mask = 0
> fs.xfs.error_level = 3
> fs.xfs.xfssyncd_centisecs = 3000
> fs.xfs.inherit_sync = 1
> fs.xfs.inherit_nodump = 1
> fs.xfs.inherit_noatime = 1
> fs.xfs.xfsbufd_centisecs = 100
> fs.xfs.age_buffer_centisecs = 1500
> fs.xfs.inherit_nosymlinks = 0
> fs.xfs.rotorstep = 1
> fs.xfs.inherit_nodefrag = 1
> fs.xfs.stats_clear = 0
>
> There is also vm/dirty tunable in /proc.
>
> I was wondering what are some things to tune for speed? I've already
> tuned the MD layer but is there anything with XFS I can also tune?
>
> echo "Setting read-ahead to 64MB for /dev/md3"
> blockdev --setra 65536 /dev/md3
>
> echo "Setting stripe_cache_size to 16MB for /dev/md3"
> echo 16384 > /sys/block/md3/md/stripe_cache_size
>
> (also set max_sectors_kb) to 128K (chunk size) and disable NCQ
>
> Justin.
>
>
|