Hello,
having experience with Heartbeat and DRBD 0.7, I now plan to use Xen
on DRBD.
I would like to get some hints before I order the hardware.
At the moment the services run on 8 Xen-DomUs, 4 physical servers (not
clustered).
Planned hardware:
- 2 servers, each of them having
- redundant Power supplies
- redundant network connections
- 4 x GB-NICs
- 4 x 1 TB HDDs (RAID10)
OS should be Debian.
The DomUs are independent from each other, i.e. Dom1-4 can run on Node
1, and Dom5-8 can run on Node2 in normal operations.
Now my questions:
1) Reading a lot via Google and in the archives it is still unclear
for me, which block-device should be on top of what.
Should each of Xen-DomUs have it's own DRBD-device? Directly on
(hardware-) RAID10? If yes, is there a benefit of LVM on top of DRBD?
Or which configuration would be 'best'?
2) Is a hardware-STONITH device still necessary? Wich one can be
suggested to buy here in Germany/Europe? Is there something less
expensive than APC PDU7921 (~500 EUR), as I would need two of them
(redundant PSUs, redundant power providers).
3) Which Cluster-Management Software should be used?
TIA
Helmut Wollmersdorfer
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