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Upgrade all drives in a cluster

 
Joshua Platon
Occasional Visitor

Upgrade all drives in a cluster

I have a cluster with about 8 to 9 storage nodes, its a mix of DL 320 and P4500. The storage nodes has 300 GB SAS drives in them, but i want to upgrade them to 450 GB SAS drives. These storage nodes has volumes in them which i need. Whats the best way to upgrade all of the drives to the larger size with out losing the data.