[DRBD-user] slow write performance (1/3rd of disk speed)

Arnold Krille arnold at arnoldarts.de
Mon Oct 7 01:37:39 CEST 2013

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


On Sun, 06 Oct 2013 18:54:12 +0200 Bram Matthys <syzop at vulnscan.org>
> I'm currently testing DRBD and am having write performance problems.
> On the local raid array I achieve 124MB/s, but with DRBD I get only
> 41MB/s out of it, or if the secondary node is down (to rule out
> network issues) then 53MB/s at best.
> Tried protocol A / B / C, with and without no-disk-barriers and
> no-disk-flushes, but this didn't change much (only +/- 2MB/s
> difference).

Yep, internal meta-disk: write block, seek to end, write log, seek to
front, write block, seek to end, write log...

Put the meta-disk on a different hd and watch your write rate go up.

- Arnold
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 198 bytes
Desc: not available
URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20131007/e4973cc7/attachment.pgp>

More information about the drbd-user mailing list