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Hi Brian, |
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Brian Kroth wrote: |
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> I currently manage about 40 Window, OSX, and Hardened Gentoo servers. |
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> I will soon have 12 P4 servers that were previously used as video |
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> encoders free as well as an Apple XRaid. With all this spare hardware |
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> I thought I'd research setting up a cluster of servers running Apache |
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> for load balancing and high availability. I'm also looking into a |
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> MySQL cluster, but that wouldn't require a shared filesystem. I'm |
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> wondering if anyone has done something like this before and in |
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> particular knows a good filesystem to use so that each of the servers |
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> can access and potentially write to the same storage array. I've |
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> accomplished the same thing with XServes running OSX, but they like to |
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> charge you a pretty penny for the XSan software that allows this which |
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> I thought I'd try to avoid if possible. So far I've seen only GFS, |
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> but haven't gotten much reading done on it yet. Any other tips or |
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> insights would be appreciated as well. |
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I currently manage 4 different shared storage systems on gentoo with |
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SAN-storage based on AoE (coraid 1520 machines) |
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We choose GFS for the filesystem. |
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It works, although the throughput is not spectacular. |
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This has partly to do with GFS and partly because the underlying storage |
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hardware doesn't support faster throughput. |
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If you have any specific questions about GFS I'd be happy to answer them. |
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Apart from that we're currently planning a Lustre deploy for fast-storage. |
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This is still very much in alpha, so no comments yet. |
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I've looked at implementing a mysql-cluster in great detail and let it |
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go because it's mostly meant for a setup with a fixed database-size. |
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If you experience (large) growth in your database volume clustering is |
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not very suitable (we're in that situation) |
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We're currently load-balancing our databases with LVS (ipvsadm) and a |
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multi-master replication setup. |
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This works out really well for us, serving estimated average 15Kq/s |
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with 50 servers on a very large dataset (> 40Gb) and a fairly random |
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read pattern. |
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I would strongly disadvise running multiple databases off GFS. |
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>From what I gathered it works well for active/passive failover sets |
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and/or active/active failover, but performance will be hurt compared to |
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a "normal" fs. |
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Regards, |
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Ramon |
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-- |
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