[DRBD-user] Slow NFS behaviour (0.7.5)

Philipp Reisner philipp.reisner at linbit.com
Wed Nov 24 15:44:23 CET 2004

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

> /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.

: Dipl-Ing Philipp Reisner                      Tel +43-1-8178292-50 :
: LINBIT Information Technologies GmbH          Fax +43-1-8178292-82 :
: Schönbrunnerstr 244, 1120 Vienna, Austria    http://www.linbit.com :

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