Hi. > AFAIK, on Lustre the data is stored on the shared block device, if one > wants to be able to fail over the service to another node. >
This the bit I don't understand - shouldn't the Lustre nodes sync the data between themselves? If there is a shared storage device needed on some medium, what then the Lustre storage nodes actually do? I mean, what is the idea of Lustre being cluster system, if it requires a central shared storage device? > But the shared block device may be a distributed mirrored block device > (like DRBD) which mirrors each data block as it is written to its peer > node. In such a configuration the data is actually stored on both nodes in > the failover pair. My guess is that this is not a common configuration for > production use. > AFAIK such config could be achieved without Lustre at all - just with 2 severs acting as storage nodes. This of course would make an active-passive mode, and waste 50% of the resources. Regards.
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