Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Writes performance on Primary+SyncSource are also very small !!!
Benoit ROPARTZ/FR/ALCATEL at ALCATEL@linbit.com on 05/10/2004 17:13:59
Sent by: drbd-user-bounces at linbit.com
To: drbd-user at linbit.com
cc:
Subject: Re: [DRBD-user] Write performance 0.7.4 versus 0.7.5 on Primary
+ SyncTarget
Ok i have tested writes speed during normal operation and i got sames
results
with two versions ~ 600 Ko/s.
But why i find difference when syncing is active (30ko=>2ko) ???
And 2ko/s is very small....
Your idea is fine (rate=5M) if there is only one resource synchronised but
not if there are many.
Benoit.
Bernd Schubert <bernd-schubert at web.de>@linbit.com on 05/10/2004 14:47:50
Sent by: drbd-user-bounces at linbit.com
To: drbd-user at linbit.com
cc:
Subject: Re: [DRBD-user] Write performance 0.7.4 versus 0.7.5 on Primary
+ SyncTarget
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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