way for failover zpool (no HAST needed)
linuxmail at 4lin.net
Tue Mar 29 11:34:11 UTC 2011
my two nodes are running fine with 8.2-stable and the LSI 9200-8e and
now, I want to build a failover for the Zpool (and later ISCSI target)
Both nodes are connected to the same disks (jbod) and now I need a way,
to get the zpool(s) running on the node with the CARP public IP.
I found something about carp, hooks, devd etc. pp. My first thought was:
carp -> hook -> zpool import -> devd -> ISCSI target up
Problem HostA: no network:
carp -> hook -> zpool export -> devd -> ISCSI target down -> OK
Back to master shouldn't be a problem, I think ...
Problem HostA: power off:
carp -> hook -> zpool import -> devd -> ISCSI target up -> OK
But a bad problem could be:
Problem HostA: SAS Cntrl/cabel problem:
carp is up and running ..., no reason to failover to slave ... -> bad
So, I mean, I have to use devd who takes notes, that the /dev/da* disks
are gone or inaccessible and inform carp or shutdown the network
interface to force carp switching over to slave.
So any hints are welcome :-)
If it works, I will write a howto for that one :-)
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