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Category: E20-855

Exam E20-855: Networked Storage-SAN Expert for Implementation Engineers

what actions need to be taken?

Previously the customer had two 8530s connected for SRDF/S via two DS8B2 with L2 ports.
Buffer credits were set to 50. The line speed was 1Gb/s and the distance was 100km. The
customer recently migrated from the 8530s to two DMX frames. The long distance configuration
remains the same (same switches and link speed). As a consequence of the migration, block size
changed from 2K to 1K. The same amount of data is being transmitted over the link. Given the
changes in the environment, what actions need to be taken?

What is recommended to prevent performance problems on the SAN?

A customer has merged four DS-32M2s to form a full mesh fabric which includes 20 dual-pathed
hosts and eight storage ports. Two ISLs are configured between each switch. The ISLs are
currently 80% utilized. The customer will be adding 10 dual-pathed Windows 2k3 Servers in the
next two weeks. What is recommended to prevent performance problems on the SAN?

How many servers can be supported based on the allocated SAN resources?

There are five FA ports allocated to a new SAN. Each server added to the SAN is estimated at
approximately 1000 IOPS. Average I/O size is 8KB/s. Each FA port can support 5000 IOPS. The
write ratio is low. The customer does not want to exceed 80% utilization of the FA ports. How
many servers can be supported based on the allocated SAN resources?


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