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List:       drbd-user
Subject:    Re: [DRBD-user] Single versus multiple DRBD devices
From:       Bart Coninckx <bart.coninckx () telenet ! be>
Date:       2014-04-18 18:55:16
Message-ID: 461905F3-1102-4497-9FA6-55BC4E8FC2FE () telenet ! be
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On 31 Mar 2014, at 13:59, Dan Barker <dbarker@visioncomm.net> wrote:

> > -----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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Dan,

what do you mean by "DRBD resources mirroring your physical environment"?


Cheers,

BC

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