[Linux-cluster] Very poor performance of GFS2

[Jordi Prats]

Hi all,
I'm getting a very poor performance using GFS2. Here some numbers:

A disk usage on a GFS2 filesystem:

[root at urani CLUSTER]# time du -hs PostgreSQL814/postgresql-8.1.4/
121M    PostgreSQL814/postgresql-8.1.4/

real    5m49.597s
user    0m0.000s
sys     0m0.004s


On the local disk:

[root at urani CLUSTER]# time du -hs postgresql-8.1.4/
116M    postgresql-8.1.4/

real    0m0.015s
user    0m0.000s
sys     0m0.016s

The GFS2 filesystem was created using this:

mkfs.gfs2 -t dades_test:postgres814 -p lock_dlm -j 2 /dev/data/postgres814

It is mounted on two machines (urani and plutoni):

/dev/data/mysql5020 on /CLUSTER/MySQL5020 type gfs2 
(rw,hostdata=jid=1:id=196610:first=0)
/dev/data/postgres814 on /CLUSTER/PostgreSQL814 type gfs2 
(rw,hostdata=jid=1:id=65538:first=0)

I supose it's caused by some problem on my configuration. What I am missing?

Thank you!

Jordi

-- 
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        / /          Jordi Prats
  C E / S / C A      Dept. de Sistemes
      /_/            Centre de Supercomputació de Catalunya

  Gran Capità, 2-4 (Edifici Nexus) · 08034 Barcelona
  T. 93 205 6464 · F.  93 205 6979 · jprats at cesca.es
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