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What would you recommend to improve the backup performance for this environment?

A customer is managing an EMC NetWorker environment with one EMC NetWorker server and one storage node that backs up approximately 70 clients. The amount of data to back up increases over a period of time that results in backups taking more than 24 hours to complete.
You use EMC Backup Advisor to analyze the current environment and find that the tape infrastructure and the network are performing fine.
What would you recommend to improve the backup performance for this environment?

Which strategy would you implement?

You work as a design specialist at Certkiller .com. The members of an active-active UNIX cluster are each configured with four identically configured HBAs, with two connections to each fabric. An array provides two fibers to each fabric with all LUNs presented on all channels. Each member’s primary application can fail to the other. Reads and writes tend to be long and sequential. You need to implement a strategy that will offer the best performance.
Which strategy would you implement?