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RE: [Xen-users] easy high availability storage
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| Subject: | RE: [Xen-users] easy high availability storage |
| From: | Nathan Eisenberg <nathan@xxxxxxxxxxxxxxxx> |
| Date: | Fri, 27 Nov 2009 18:51:04 -0800 |
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| Thread-topic: | [Xen-users] easy high availability storage |
> If double write is what you need, my first suggestion already does > that: > - san exports its storage as iscsi > - server/PC imports iscsi share from both san > - setup raid1 on server using those two iscsi imports > > no need to modify xen code as linux md can already do it. > > -- > Fajar The problem I've encountered with doing HA storage in the domU is that you are now doubling the required throughput of the dom0's iSCSI interface, which is already easy to bottleneck if it's only GigE. 125MB/s may seem like a lot of throughput, but if you start by cutting that in half for RAID traffic, and then share that remaining bandwidth across 5 domU's, you're going to fill it up pretty quick. The other problem is that if you ever take a node down, and you have 5 domUs configured in this way, when that node comes back up, all of your domUs will attempt to resync the mirror simultaneously. I'd bet that this could actually lead to catastrophic kernel panics, as the domUs can become IO starved. -Nathan _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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