Click on the calculator icon in the upper left-hand corner. A customer has four (4) LUNs of 500 GiB each, six (6) LUNs of 250 GiB each, and five (5) LUNs of 100 GiB each. All the drives presently in their VNX system are SAS and NL-SAS. They wish to implement FAST Cache. Your data collection shows the skew to be 95%. What is the minimum size of FAST Cache recommended for this environment?

Several Windows servers are allocated storage from the VNX array. The customer would like to know whether any of these servers are subject to disk crossing.

What tools are available to verify this condition?

Your customer wants to add Flash drives to their VNX array and use them as FAST Cache. They have specified that they want at least 150 GB of actual FAST Cache capacity on each SP. There are no Flash drives in the array and they want to follow EMC best practices on hot spares.

How can this be achieved?

Your customer is designing a newly purchased VNX with 30 NL-SAS drives. The customer’s requirements in order of priority are 1) data availability and 2) performance.

What RAID type do you recommend?

During a customer data gathering meeting, a discussion about applications was presented. Most of the applications will best be suited for a RAID 5 pool on the VNX. However, one of the applications has an I/O requirement for RAID 1/0 spindles.

How should the RAID 1/0 application requirement be handled?

Several Windows Server 2008 and RedHat Linux 5.5 servers are attached to VNX storage arrays. PowerPath version 5.5 was installed on all Windows servers but not on any of the Linux servers. Linux servers are using native MPIO for path failover. What are the required failover modes for Windows Server 2008 and RedHat Linux 5.5 servers?

Refer to the exhibit.

A customer is analyzing the size of data sent to disk. Which command generated the output?

You are reviewing a NAR file and notice that a LUN has a write cache hit ratio of 0.0.

How can you tell if write cache is enabled for the LUN?

Your customer has established a new virtual pool of storage containing NL-SAS drives in a RAID 5 configuration. Recently they have noticed that performance on the entire array is affected between
1:00AM and 4:00AM.

What information would best indicate the root cause?

You are reviewing log files for a customer’s application using Analyzer, and note the followinG.

– NFS write size is 8 KiB LUN
– Write size is 8 KiB
– Disk write size is 32 KiB

You can see that LUN write sizes are identical at 8 KiB.

Why is the application not writing at 32 KiB?