[DRBD-user] One resource per disk?

[Paul O'Rorke]

I create a large data drive out of a bunch of small SSDs using RAID and 
make that RAID drive an LVM PV.

I can then create LVM volume groups and volumes for each use (in my case 
virtual drives for KVM) to back specific DRBD resources for each VM.  It 
allows me to have a DRBD resource for each VM, each backed by an LVM 
volume which is in turn on a large LVM PV.

VM has DRBD resource as it's block device --> DRBD resources backed by 
LVM volume --> LVM volume on a large RAID based Physical Volume.

I can resize resources to my heart's content.  :-)

*Paul O'Rorke*
*Tracker Software Products (Canada) Limited *
www.tracker-software.com <http://www.tracker-software.com/>
Tel: +1 (250) 324 1621
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On 2018-05-01 07:38 AM, Yannis Milios wrote:
> I would prefer the 2nd option. Ideally all disks would be members of a 
> RAID(10?) array, with  DRBD sitting on top for the replication, and 
> LVM for managing the volume.
> Another option would be ZFS managing the disks and the volume, while 
> DRBD sitting on top for the replication. This very same scenario would 
> also apply for LVM (thin or thick).
> There's no right or wrong, depends on what your needs are.
>
> I would avoid having single points of failure though, like single 
> drives in any case...
>
> On Tue, May 1, 2018 at 3:12 PM, Gandalf Corvotempesta 
> <gandalf.corvotempesta at gmail.com 
> <mailto:gandalf.corvotempesta at gmail.com>> wrote:
>
>     Hi to all
>     Let's assume 3 servers with 12 disks each
>     Would you create one resource per disk and then manage them with
>     something like LVM or a single resource from a huge volume over
>     all disks?
>
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