Windows systems are connected to the node that holds the data. This because of the DSM driver.
For VMware this feature is available for SanIQ >= 12.5 with necessary patch installed for vSphere 5.5 and later.
Advantage of Multisite Cluster is that Gateway is always on local site.
To be able to failover after a complete site failure at least nRAID-10 is necessary.
Migrate Data
Cluster Swap
Create a new cluster using new nodes
Present the new VIP to existing hosts
Start Cluster Swap in CMC
P4000 replicates data from existing cluster to new cluster
after completing, traffic from hosts just accessing new cluster
Adding new nodes to existing cluster
Add new node to cluster, wait to complete re-striping
Remove old node from cluster
repeat until ever node is replaced
General information
When adding a new node, it is optimally the same as already used nodes in the cluster. Otherwise the used capacity of the new node will just be as the capacity of existing nodes.
Queue size
Acceptable queue size of disk is 2.
Acceptable queue size of node = (number disks) * 2
Acceptable queue size of cluster = (number disks) * (number of nodes) * 2
When there is a high write rate in cluster presenting storage to Oracle database, check archiving protocol data when there is a very high write density.
