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On Tue, 2009-06-16 at 16:45 +0300, Daniel Iliev wrote: |
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> DRBD is HA solution which is achieved by switching the role of the |
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> nodes in case the "active node" goes offline. I think DRBD is not meant |
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> for the schema OP has described, because only the "active node" is |
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> accessible via FS. DRBD works between the FS and block device layers. |
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> It catches the FS writes from the active node and sends them over the |
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> network. DRBD on the backup node receives those and replicates them |
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> directly to the disk driver. Thus you can't have mounted FS on the |
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> backup node. If the active node goes offline, the backup node takes |
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> over which means DRBD switches roles and the FS has to be mounted |
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> afterwards. |
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But that might be a good solution with 2.6.30, NFS and FSCACHE. |
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Another solution would be to use ndb (network block devices), dm-raid |
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and a cluster filesystem. |
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Philipp |
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