brem belguebli pisze:
Hello,
I need to setup a 4 nodes cluster for hosting a few database instances.
The main constraint being that this cluster has to be equally
distributed on 2 different sites (distance less than 100 km), ie 2
nodes on each site.
The storage being based on 2 FC disk arrays, one on each site,
connected thru 2 SAN fabrics for redundancy and failover.
Each database instance runs on one node, a should be able to switch to
another in case of machine crash.
I would like to use CLVM with mirror (or mdadm) to give access each
node to both disk arrays (local and distant).
In case something happens on one site(disaster) , the nodes on the
other site should be able to take over the failing nodes by hosting
the databases instances that failed.
My questions concern :
- Quorum: In case of a disaster, the remaining nodes won't have the
majority (2 over 4)
- If I use qdisk, on wich site to put it ? the disaster could occur on
any site
Use qdisk and mirror it over network.
- CLVM with mirror (or mdadm layer to built on top of it CLVM) is a
"supported " setup ?
Do not use mdadm for mirroring. If You SAN support remote mirroring use
it or configure DRBD(it supports only two servers) [1].
This post [2] could help You also.
[1] - http://www.drbd.org/
[2] - http://archives.free.net.ph/message/20090311.200230.23f4f917.pl.html
Best Regards
Maciej Bogucki
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