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List:       drbd-user
Subject:    Re: [DRBD-user] Single versus multiple DRBD devices
From:       Dan Barker <dbarker () visioncomm ! net>
Date:       2014-03-31 11:59:25
Message-ID: e3c0f4525e754af6920a264d17c43275 () BN1PR04MB060 ! namprd04 ! prod ! outlook ! com
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> -----Original Message-----
> From: drbd-user-bounces@lists.linbit.com [mailto:drbd-user-
> bounces@lists.linbit.com] On Behalf Of Bart Coninckx
> Sent: Monday, March 31, 2014 6:51 AM
> To: Arnold Krille
> Cc: drbd-user@lists.linbit.com
> Subject: Re: [DRBD-user] Single versus multiple DRBD devices
> 
> 
> 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
> 
> 
> Sounds reasonably! Thank you for your input!
> 
> BC
> 

What Bart is suggesting is matching your drbd definition to your physical \
environment. Your OP was about the logical environment. You'll probably have a \
combination of factors drive your design. For example, I have four DRBD resources \
servicing about 20 VMs. The four DRBD resources mirror my physical environment and \
the VMs are spread around on these four devices to minimize the impact of a failure \
or slow-down on any one.

Dan

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