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Am Dienstag 16 Juni 2009 15:58:37 schrieb Philipp Riegger: |
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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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> |
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> But that might be a good solution with 2.6.30, NFS and FSCACHE. |
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> |
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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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And finally, there's OpenAFS. Not really RAID, but maybe sufficient. |
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Bye... |
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Dirk |