On Fri, 27 Oct 2006, Mustafa A. Hashmi wrote:
On 10/27/06, Brent A Nelson <[EMAIL PROTECTED]> wrote:
You can't do a drbd0.8-style active/active, i.e. you can't have a single
storage partition be served by multiple servers simultaneously.
Actually, drbd 0.8 allows for both nodes to be masters now -- I was
wondering if this what you meant by active/active on nodes.
Right; you can't do that with a Lustre partition. GFS can do that,
although I would expect its performance to be much lower than Lustre.
However, you can serve different partitions/disks/logical volumes/whatever
from different servers and be active/active that way (Lustre will merge
all these different partitions into one filesystem, or for however many
you have it configured). If one node fails, you just failover its
partitions to the drbd "sister" server.
That is indeed our current setup -- however, that makes an
active/passive setup where the replicated drbd partitions are
passively standing by till heartbeat fails them over (and makes them
primary).
active/passive from a storage partition standpoint, right, but
active/active from a node-level point-of-view. One server serves out half
the storage while the other server serves out the other half (even if it's
the same Lustre filesystem, so you do get the performance boost of both
servers running simultaneously).
Thanks,
Brent
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