Hi,

I’m trying to get more performance out of my DRBD cluster with gfs2.

It seems that our gfs2 implementation is quit slow.

When running the ping_pong test we get no more than a 1000 locks/sec on the disk.

./ping_pong /mnt/backup/test.dat 4

879 locks/sec

The cluster config has been updated with:

        <dlm plock_ownership="1" plock_rate_limit="0"/>

        <gfs_controld plock_rate_limit="0"/>

gfs2_tool getargs /mnt/backup

statfs_percent 0

data 2

suiddir 0

quota 0

posix_acl 0

upgrade 0

debug 0

localflocks 0

localcaching 0

ignore_local_fs 0

spectator 0

hostdata jid=1:id=2752514:first=0

locktable

lockproto

gfs2_tool df -H

/mnt/backup:

  SB lock proto = "lock_dlm"

  SB lock table = "cybercenter:backup"

  SB ondisk format = 1801

  SB multihost format = 1900

  Block size = 4096

  Journals = 2

  Resource Groups = 7451

  Mounted lock proto = "lock_dlm"

  Mounted lock table = "cybercenter:backup"

  Mounted host data = "jid=1:id=2752514:first=0"

  Journal number = 1

  Lock module flags = 0

  Local flocks = FALSE

  Local caching = FALSE

  Type           Total          Used           Free           use%          

  ------------------------------------------------------------------------

  data           3T             1T             1T             47%

  inodes         1T             96M            1T             0%

Hdparm information of the disk:

hdparm -tT /dev/sdb

/dev/sdb:

Timing cached reads:   20988 MB in  2.00 seconds = 10512.28 MB/sec

Timing buffered disk reads:   74 MB in  3.05 seconds =  24.30 MB/sec

Has someone an idea about increasing the performance of my gfs2 filesystem?

Kind Regards,
Leo Arnts