[DRBD-user] 4TB limit

Lars Ellenberg Lars.Ellenberg at linbit.com
Thu Oct 19 11:40:51 CEST 2006

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

/ 2006-10-19 09:42:03 +0200
\ Ralf Gross:
> Hi,
> if I understand the documentation correct, there is a limit of ~4TB
> for a single drbd device on 32bit systems. Furthermore lvm on top of a
> drbd device is not recommended.
> What is the recommended way to use drbd and lvm for filesystems that
> are >4TB. My aim would be to have only one mount point, hence lvm on
> top of drbd would be desired.

the reason why it is not recommended is that you may run into funny
things in the lvm part when only part of the drbd pvs are Primary
on the node...  and several TB of storage takes ages to initialize
with current drbd 0.7.

but as long as your heartbeat scripts do behave, and you generally know
what you are doing, it is certainly possible to have lvm on top of drbd
without problems.

drbd-plus can (currently) handle 16TB per device, and initializes
much faster.  you have to by a licence from linbit,
but you get an implicit support contract for it, too.


: Lars Ellenberg                                  Tel +43-1-8178292-0  :
: LINBIT Information Technologies GmbH            Fax +43-1-8178292-82 :
: Schoenbrunner Str. 244, A-1120 Vienna/Europe   http://www.linbit.com :
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