[DRBD-user] Single versus multiple DRBD devices

Bart Coninckx bart.coninckx at telenet.be
Mon Mar 31 12:51:07 CEST 2014

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

On 28 Mar 2014, at 22:04, Arnold Krille <arnold at arnoldarts.de> wrote:

> On Fri, 28 Mar 2014 10:40:28 +0100 Bart Coninckx
> <bart.coninckx at 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!


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