[DRBD-user] A Summary of LVM snapshots with DRBD

Lars Ellenberg Lars.Ellenberg at linbit.com
Thu Apr 8 17:23:03 CEST 2004

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


/ 2004-04-08 13:57:30 +0200
\ Michael Hoennig:
> Hi Lars,
> 
> >	*You can do so already*,
> >	by using LVM2 on top of DRBD.
> >
> >So implementing additional hacks and hooks is just very low priority.
> 
> a setup which we have in mind would be something like this:
> 
> 
> Host HA:
> - Virtual Host VA mirrors to HB.
> - Virtual Host VB mirrors to HC.
> - Virtual Host VC mirrors to HD.
> 
> Host HB:
> - Virtual Host VD mirrors to HA.
> - Virtual Host VE mirrors to HC.
> - Virtual Host VF mirrors to HD.
> 
> Host HC:
> - Virtual Host VG mirrors to HA.
> - Virtual Host VH mirrors to HB.
> - Virtual Host VI mirrors to HD.
> 
> Host HD:
> - Virtual Host VJ mirrors to HA.
> - Virtual Host VK mirrors to HB.
> - Virtual Host VL mirrors to HC.
> 
> LVM would make sense to be able to assign different sizes to the Virtual
> Hosts. But in a setup LVM2 on top of DRBD it could not work.  It would
> be needed the other way around.

now, you could have several "Virtual Hosts" on the same DRBD, using
different LVs in the LVM2 on top of it :)

> But it is only a wild idea anyway.  Also because the setup could be very
> confusing and thus error prone.

Agreed.

	lge



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