[DRBD-user] Choosing right combination of md-raid, LVM and DRBD

Roger Tsang perj8 at hotmail.com
Fri Sep 28 00:33:02 CEST 2007

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

For those brave souls out there you can try the HA features of
OpenSSI-1.9.3 for Fedora Core (www.openssi.org).  Its DRBD-SSI (based
on drbd-0.7.24) supports DRBD root filesystem with the limitation that
only the root filesystem must not be on LVM.  It is cluster-aware so you
don't have to worry about losing IP addresses, etc.  LVM over DRBD or
DRBD over MD for non-root filesystems has been tested in 1.9.3 and


> From: florian.rustedt at smartnet.de
> To: drbd-user at lists.linbit.com
> Date: Thu, 27 Sep 2007 16:27:27 +0200
> Subject: [DRBD-user] Choosing right combination of md-raid, LVM and DRBD
> Hello List,
> We want to setup a new HA-server and are on the way to test drbd/heartbeat.
> We have two servers with two disks per server and two Gbit-ifaces in each.
> What is now the best(most performant and secure) way to configure this?
> MD-Raid mirror on the disks per server, then LVM ontop and then DRBD on the
> resulting partititions? Or LVM -> RAID -> DRBD?
> And what is the right setup for the partitions?
> The ideal-case would be, that both systems are able to boot the same data
> from scratch, but i saw in the list and google, that most systems do NOT
> use DRBD for the root-partition? Why not? Isn't it stable enough?
> So what is the best way to partition tihs beast? And why?
> And is basically LVM a good choice or does it have a remarkable impact on
> performance, so it would be better, to keep rid of it?
> Kind regards, Florian
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