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List:       drbd-user
Subject:    Re: [DRBD-user] Two resources on a single disk
From:       Lars Ellenberg <Lars.Ellenberg () linbit ! com>
Date:       2004-02-24 16:44:48
Message-ID: +nbsKIO44el7+kU7iMP8Gtw=lge () web ! de
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/ 2004-02-24 18:15:30 +0200
\ dhz_bf@walla.co.il:
> 
> We are currently using drbd with a big partition for high
> availability between two machines.  We have a problem of disk
> space and one way of solving it is to divide the big partition
> to two partitions, and have drbd synch both of them between the
> two machines.
> 
> I have read the drbd article on the documentation directory of
> drbd-0.6.11 and the configuration file example there has a
> configuration similar to the one I require.  Two partitions on a
> single disk.  The comment, however, warns against using such a
> configuration, since we may get poor performance.
> 
> What should I expect to be the extra cost in performance of
> dividing the big partition into two, given the the amount of
> writes to the two partitions remains the same as the one to the
> single partition we currently have.

The issue is maily with a full synchronisation.
You can avoid the seektime killing your performance by using two
different sync-groups for the two devices.

	Lars Ellenberg

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