A system administrator wants to migrate medical-imaging data stored on an EMC VNX. The host
connects to the VNX via iSCSI. The IP SAN infrastructure has recently been updated to support 1
Gb/10 GB switching. The system administrator wants to maximize data transfer performance.
What would you recommend?

A customer has a CIFS DR solution with EMC VNX using a One-to-Many replication topology. The
customer asks you to explain replication behavior under the following conditions:
• Production site failover or switchover to a DR site
• Replication start and reverse is performed

What would you advise the customer?

Click on the calculator icon in the upper left-hand corner.
A SQL database requires 1,000 I/O per second with 85% reads and 15% writes. If RAID 1/0 is
used, what is the total number of spindles required to generate the required I/O per second?

A customer has two EMC VNX configured to replicate between sites. Each VNX has dual Control
Stations. The primary Control Station at the source site fails at 6 p.m. and reboots. At 8 p.m., the
customer completes DR testing and observes CIFS replication does not failover to the target site
VNX. Why does CIFS replication not failover to the target VNX during the DR test?

A customer has two identically configured Linux hosts (OS version, memory, CPU) attached to the
same network. One host is NFS-attached and the other is FC-attached to an EMC VNX. Both the
NFS file systems and the SAN LUNs are created from four RAID 5 (4+1) RAID groups. LUNs are
not shared between file and block.
The customer reports NFS-attached host is able to achieve much greater throughput via NFSv4
versus the FC-attached host.
What is the source of the performance difference between the file and block configurations?

A client has an EMC VNX configured with four storage ports, four 15-drive DAEs (disk array
enclosures) and a total of forty drives (20 NL-SAS and 20 SAS drives). The client is using RAID 5
(4+1) RAID groups with a traditional LUN configuration.
What is the recommended SAS LCC port configuration for optimal performance?

A customer requests a performance review of their EMC VNX before FAST Cache is
implemented. You notice a dedicated LUN has a write size of 4 KB, and the disks are performing
writes of 8 KB. What is causing this behavior?

A customer has two identically configured Linux hosts (OS version, memory, CPU) attached to the
same network. One host is NFS-attached and the other is FC-attached to an EMC VNX. Both the
NFS file systems and the SAN LUNs are created from four RAID 5 (4+1) RAID groups. LUNs are
not shared between file and block and each host generates the same size I/O.
The customer reports the FC-attached host is able to achieve much greater throughput than the
NFS-attached host.
What is the source of the performance difference between the file and block configurations?

A customer has two EMC VNX, one at the primary site and the other at a DR site located 100 km
away. The WAN connection between sites is a 100 Mb/s dark fiber link with 4 ms latency.

A previous storage administrator configured the pool LUNs for the file system on thin LUNs. The
file system is growing at a rate of 500 GB per week and is on a VDM. The new storage
administrator reports performance issues with the file system.
What is the most likely reason for the performance issue?

A customer plans to connect ESXi 5.0 hosts to a new EMC VNX array. They want to take
advantage of the hardware-assisted locking feature in VAAI. Which is a feature of hardwareassisted locking?