[DRBD-user] newbie 1st question

Mike Lovell mike at dev-zero.net
Fri Apr 9 18:46:22 CEST 2010

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

Joao Ferreira gmail wrote:
> Hello all,
> I'm just trying my first steps with DRBD... lets assume I have the
> following base partitions/mounts:
> /dev/sda1/ --> /
> /dev/sda2/ --> /home
> /dev/sda3/ --> /var
> let's say I wish do have drbd on "/" and "/home"... are there any hard
> restrictions or just simple natural concerns in having the root "/"
> filesystem under drbd... ?
doing / on a drbd volume is really hard. it would involve having to most 
of your system startup, including drbd, into a initrd or initramfs and 
have the kernel bring all of that up before mounting and doing 
pivot_root. putting drbd in the initrd/initramfs is something that is 
frowned upon. so in other words, don't bother. its too big of a pain.

/home should be do-able on drbd and be relatively easy depending on your 
distro. it should be noted though that, in the default operating mode 
(which a newbie should definitely use), only one of the two servers can 
mount the drbd resource. so only the primary will be able to mount 
/home. your distro might not like having /home not available on system 
boot up and make starting up the secondary a bit of a pain. but 
definitely do-able.

hope that helps.


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