[DRBD-user] Multi-disk devices possible?

Sebastian spa at syntec.co.uk
Fri Jun 3 11:06:14 CEST 2011

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

Thanks for all the replies.

drbd-user-bounces at lists.linbit.com wrote:
> On 06/02/2011 08:05 PM, Stefan Seifert wrote:
>> Create a (software) RAID out of your disks and use that as
>> underlying device for drbd.

In fact I am not talking about physical disks anyway, just disks as they
appear to fdisk.  The 8 physical disks are in a RAID 5 array, with 4 LUNs
on.  Then we have ESXi on top, so the disks are virtualized.  Partitions on
all 4 are available for DRBD.  So, anyway, there is no need to create a
software RAID, and there is already a hardware RAID, and I cannot make the
LUNs the maximum size because that is over 2 TB and VM datastores cannot be
over 2 TB. Plus the bigger the datastore, the larger the block size and the
more wasted space there is likely to be.

> Or if you're scared of such things, include the disks in an LVM Volume
> Group and create a volume of the desired size for use as your backing
> device. 
> Cheers,
> Felix

I presume that to do this I would need to break my existing DRBD set-up and
possibly lose all the data on it?  How can I do this without losing the
data?  Can I make the cluster stand-alone, reconfigure one of the nodes to
use an LVM Volume as my backing device, make that one the primary, wait
until it resyncs, do the same on the other node, then extend the DRBD
device, and then extend the filesystem?

Kind regards,


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