[DRBD-user] Before swap to DRBD
m.watts at eris.qinetiq.com
Tue Oct 26 11:13:47 CEST 2010
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On 10/25/2010 08:37 PM, Sam Przyswa wrote:
> Before to swap my Zimbra and Postfix server on DRBD I have some questions:
> My actual setup run Zimbra (collaborative app) and Postfix in
> virtualization on 2 vserver guest and LVM, each virtual machine / is a
> logical volume. I plan to run the LVM over DRBD.
> 1) - First of all is the LVM on DRBD is really fiable in production mode ?
Using an LVM volume for DRBD backing store, and using a DRBD block
device as an LVM physical volume are both supported.
> 2) - In case of DRBD crash on primary is it tools to recovery the
> filesystem and what about the secondary ?
Assuming DRBD is in Primary/Secondary UpToDate/UpToDate, then an fsck on
the primary node is all you need.
Remember, DRBD is replicating changes to blocks. If that happens to
correspond to writes by a filesystem, then great.
> 3) - To migrate to the new setup I have to configure the secondary
> machine with only one machine as primary to create the logical volume
> and install the vservers. Is it a problem to start DRBD with only one
> machine before install DRBD and LVM on second machine and sync after ?
Single-node DRBD is fine. When you do eventually connect the second
node, a full sync will occur so you may wish to do this during scheduled
down-time or overnight.
It's best to have drbd.conf configured for both nodes though, just don't
start DRDB on the second node until you are ready.
Mark Watts BSc RHCE
Senior Systems Engineer, IPR Secure Managed Hosting
QinetiQ - Delivering customer-focused solutions
GPG Key: http://www.linux-corner.info/mwatts.gpg
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