[DRBD-user] Write performance 0.7.4 versus 0.7.5 on Primary + SyncTarget

Bernd Schubert bernd-schubert at web.de
Tue Oct 5 14:47:50 CEST 2004

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


On Tuesday 05 October 2004 14:29, Benoit.Ropartz at alcatel.fr wrote:
> Kernel : 2.4.20 (PPC)
> DRBD : 0.7.5 & 0.7.4
> FileSystem : ext3 / data=journal & sync
>
> Hello,
>
> I copying a file of 512ko on Primary whereas the state of its connection is
> SyncTarget.
>
> Results :
>
> 0.7.4 DRBD version : 15s (~34k/s)
> 0.7.5 DRBD version :  4mn33s (~1.8k/s)
>
> Same test with a file of 5Mo.
>
> Results :
>
> 0.7.4 DRBD version :  3mn53s (~22 k/s)
> 0.7.5 DRBD version :  ....too long....(syncing is finished before writing)
>
> With new DRBD release 0.7.5, writing are very slow !!!

You mean, you only did write tests while both nodes are in syncing process? 
Well, could you please also tell us the write speed during normal operation 
(connected state?)?

If the write speed is only slow during a synchronisation, you might want to 
reduce the sync speed, e.g.:
        syncer {
                rate 5M;
        }

Cheers,
 Bernd



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