Hi Gary,
if you want to fail over RG's independent from the storage, you must
have the file system available on all nodes of the cluster. This is
achievable with our global mount option.
Unfortunately you can not do this with zfs, but it works perfect with
ufs on top of Uolaris volume manager. In such a configuration only one
RG will contain a HASP resourc, and each RG has its logical host.
So SC works perfect in such a situation, but not with zpools, as
zpools do not work with the global mount option.
HTH
Detlef
On Jul 15, 2011, at 2:00 AM, Martin Rattner wrote:
Gary,
You can avoid the problem you originally encountered by using
multiple RGs, even if there is only one shared zpool and one shared
IP resource. With multiple RGs you can have one data service fail
to start (and end up offline) while the other data service goes
online successfully.
My previous email gave details about the use of RG affinities.
On 07/14/11 13:33, Gary Mills wrote:
Two RGs only make sense if the services can move
between nodes
independently. Given that they depend on one zpool
and one IP address,
then the services can only be online on one node at
any one time. As
such, putting them in the same RG will always lead to
the problem you've
already encountered.
Okay, that's unacceptable.
The only way to solve this is to give each service
its own IP and its
own zpool.
In that case, I'll have to abandon the cluster product. We have a
large
number of small services to provide. The shared storage device can't
possibly provide that number of zpools. It has only two disks in a
ZFS
mirror, a configuration that's more than sufficient for storage and
performance. I'm also reluctant to set up a different IP address for
each service, simply because there are so many of them.
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