[DRBD-user] Slow NFS behaviour (0.7.5)

Eugene Crosser crosser at rol.ru
Wed Nov 24 15:55:58 CET 2004


Philipp Reisner wrote:

>>/me curses the sysadmin fate...
>>
>>At the moment I'm thinking how should I explain to users, that every mount
>>is now exported async, over tcp and we're having ~ 1GB buffers on the
>>server just to mitigate the commits load. Then you get the drbd (which, in
>>it's fairness is protocol C; but I don't know why, as I could as well use
>>A with with current settings of al-extents 521; and max-buffers 131072;).
>>
>>Is there really no way to have transaction safe NFS server on DRBD that
>>doesn't crawl like rats-assed three legged turtle on valium? :>
> 
> 
> My conclusio is:
> 
> DRBD:                Protocol C
> Filesystem on DRBD:  async (default)
> NFS export:          sync  (new default)
> 
> If performance is too low "tune" NFS by making the export async.

my setup for mailbox store NFS server:

DRBD:			protocol C
Filesystem on DRBD:	journal=ordered(? - default for ext3), noatime
NFS export:		sync,no_wdelay

Mounted on clients as:	nolock,nfsvers=3,rsize=32768,wsize=32768

(I use lock file locking in delivery agent and pop/imap servers)

Eugene
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