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To this array, what is the maximum number of nodes that can be added and still maintain the high availability

Certkiller .com has a CX400 array that is directly attached (DAS) to two dual-attached Solaris servers in a cluster configuration. A decision is made to grow the number of nodes in the cluster, due to a growth in customer base and overall system I/O. The customer wants to add as many nodes as possible. To this array, what is the maximum number of nodes that can be added and still maintain the high availability nature of the current configuration?

Which feature should the customer implement to prevent this in the future?

A customer attempted to restore data to a corrupted LUN that has multiple clones associated with it using Replication Manager. After the restore, the customer tested the data and it was still corrupted.
When they went to use one of the other clones of the source LUN, they were corrupted as well.
Which feature should the customer implement to prevent this in the future?

What should you do first to begin to understand the problem?

You work as the new Storage Administrator (SA) at Certkiller .com. Certkiller .com users complain about long wait times on the data files. Upon investigation, you discover that there are two servers used by the application, a database server and an application server, with data co-located on the same symmetrix. What should you do first to begin to understand the problem?