[OpenAFS] Re: vos move speed rates

[Harald Barth]

> Anyone have experience using XFS or other filesystems instead of ext*?

*waves*

I am using xfs now and plan to use xfs on my new servers. This time I
will try to tune xfs as well. Currently I lean to the following config:

Dell515 with Centos 5

HW mirrored SATA disks for root file system and xfs log (/dev/rootvg/vicepalog)

md RAID6 over 6 SAS disks (/dev/vicevg0/vicepa) at a time 

md tuning: 
echo 16384 > /sys/block/md0/md/stripe_cache_size

xfs creation parameters: 
mkfs.xfs -f -l logdev=/dev/rootvg/vicepalog,size=134217728,lazy-count=1,su=4k /dev/vicevg0/vicepa 

xfs mount parameters:
noatime,nodiratime,logbufs=8,logdev=/dev/rootvg/vicepalog

Result so far:

Version 1.03e       ------Sequential Output------ --Sequential Input- --Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
gourami-a    32088M           442872  60 103527  26           561788  73 994.7   3
                    ------Sequential Create------ --------Random Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16  8313  21 +++++ +++  6130  15  7618  22 +++++ +++  4533  12
gourami-a,32088M,,,442872,60,103527,26,,,561788,73,994.7,3,16,8313,21,+++++,+++,6130,15,7618,22,+++++,+++,4533,12

I like the 4533 deletes per second. Untuned that number was 650.

If you see any errors in the above or have more suggestions, please don't be shy.

Harald.