E20-885 Real Exam Questions

You review a Unisphere Analyzer report from a customer's EMC VNX. You observe that disk read activity is higher than can be accounted for from host reads and normal pre-fetch activity. What is the likely cause?

A heterogeneous Pool is created as follows: - 5 x 200 GB FAST VP optimized Flash drives, configured as 4+1 R5 - 10 x 600 GB 10K rpm SAS drives, configured as 4+1 R5 - 16 x 2 TB NL-SAS drives, configured as 6+2 R6 Ten equal-sized thick LUNs are created on the pool at 5 minute intervals. No space is left in the pool. All parameters are left at the default value. Testing is started at 9:00 A.M. on the 10 LUNs using IOmeter. The R/W ratio for the testing is set at 3:1, and 4 kB random I/Os are performed. What throughput do you expect to see from the LUN that was created 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 that 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 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?

You have implemented Block Deduplication on a pool servicing a workload with a 60:40 read/write ratio, and consisting of small random IOs. This pool contains a large amount of duplicate data. After the first few deduplication processes, you notice that host response time has increased significantly. What could be the cause of this impact on performance?