When to use a FOM on P4000?

[declan_1]

Hi,

I have a P4000 SAN configured as follows:

4 nodes in building 1 and 4 nodes in building2 configured as a single cluster with 8 nodes.

The buildings are linked by two fiber intersite links and both are on the same subnet, so just one big dedicated iSCSI network.

I have 3 esx hosts in each building which can see all of my volumes on the P4000, all the volumes are network raid 10 (2 way mirror).

I have started managers running on 3 nodes in building 1 and 2 nodes in building 2, so 5 regular managers among 8 nodes.

If I lose one of the buildings will my volumes still be available? Do I need a FOM in this configuration?

Any clarification would be appreciated.

Thanks,

D

[Jitun]

Yes FOM is recommended.
FOM as the 5th Manager on the 3rd Site (with access to both the Sites)

As the 5th manager if present on any of the 2 sites can result in Quorum loss, if the Site that went down had 3 of the 5 managers.