I've heard of people trying to create GNBD SANs in the past... Some
have gone so far as to have many nodes and pool the mirrors together...
It can be tricky. IIRC, one of the trickiest parts was bringing the
node back, reinserting the GNBD disk into the volume group, and
converting back to mirror.
Also, I think the remote node uses the GNBD interface, while the local
node simply uses the local interface. You may be able to use iSCSI
too, but I'm not sure.
brassow
On Feb 19, 2008, at 7:51 AM, Lajkó Attila wrote:
I disconnected the lun from both nodes and it worked, the LV went to
linear. Thanks for the help!
One more question, what do you think about this testing scenario:
Two-nodes cluster, each node has a local disk which is exported via
GNBD to itself and to the other one. I build a cluster-mirrored LV
on the GNBD devices, then I kill one of the nodes. In this case, the
cmirror should work well? The LV will go to linear mode?
Attila
On Feb 18, 2008, at 7:30 PM, Jonathan Brassow wrote:
That's the problem. (C)LVM does not currently have a way to handle
the disappearance of a device from just one machine... it expects a
similar view of devices from all machines in a cluster. "Locking"
on the second node fails because it doesn't know what to do with
the disk that it sees (that has been removed from the node
suffering the failure).
There is someone working handling orphaned/removed devices that
reappear (which would be similar to this case), but I'm not sure if
they've taken this scenario into account. I'll let him know about
this.
brassow
On Feb 18, 2008, at 10:48 AM, Lajkó Attila wrote:
Yes, I disconnected the lun via the Vtrak GUI from one of the
nodes (el4).
Attila
On Feb 18, 2008, at 5:08 PM, Jonathan Brassow wrote:
How are you performing the failures? It looks like just one
machine is loosing its connection to the device, while the other
machines links remain in place.
brassow
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