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List:       drbd-user
Subject:    Re: [DRBD-user] Single versus multiple DRBD devices
From:       Bart Coninckx <bart.coninckx () telenet ! be>
Date:       2014-03-31 10:51:07
Message-ID: 7CB6A218-2687-4B72-B513-543A6A2D9D0B () telenet ! be
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On 28 Mar 2014, at 22:04, Arnold Krille <arnold@arnoldarts.de> wrote:

> On Fri, 28 Mar 2014 10:40:28 +0100 Bart Coninckx
> <bart.coninckx@telenet.be> wrote:
>> 	All,
>> 
>> 
>> building a storage cluster which will offer SCST targets. These will
>> be LVM based (nested LVM probably). In terms of performance, what is
>> the most optimal strategy: one big DRBD device where the different
>> Logical Volumes are installed on or a DRBD device per LV? If a resync
>> needs to be done, the latter will probably better, as it allows us to
>> choose which devices should be resynced first.
> 
> I do have several drbd volumes instead of one big. Then you can
> choose which ones to sync first. And if your volumes are on different
> disks, the order can be defined to sync volumes from each disk one
> after the other but volumes from different disks in parallel. That way
> one can max out a 2x10G connection with three volumes from three disks
> all reading/writing sequential, instead of the disk stepping in its own
> way by reading from several volumes on the same disk while the other
> disks are idle...
> 
> And several drbd-volumes can fail-over individually.
> 
> Have fun,
> 
> Arnold
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Sounds reasonably! Thank you for your input!

BC

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