A customer wants to reduce the performance impact that Incremental SAN Copy (ISC) has on their source LUN.
They plan to use a clone between the current source and destination LUN, and then use the fractured clone as the new ISC source LUN. The source LUN performs 400, 8 KB random I/O per second, with a 3:1 read/write ratio. The source LUN is 512 GB in size, and the clone will be fractured for five minutes.
How much data will be copied to the destination LUN?
A. 937.5 MB
B. 3,750 MB
C. 7,500 MB
D. 14,750 MB
A customer is using VNX Replicator to replicate data from a single file system to a remote location. They are planning to replicate more file systems, but monitoring tools are showing bursts of data on the link instead of a smooth and constant flow of data. They also notice that latency on the link is higher than expected.
What would you advise them to do to make more efficient use of the link?
A. Use multiple network interfaces for the Data Mover interconnects
B. Use Unisphere QoS Manager to throttle bandwidth for Replicator
C. Set the TCP fast timer to 500 ms
D. Set the TCP slow timer to 200 ms
A customer is using VNX Replicator to replicate data from a single file system to a remote location. They are planning to replicate more file systems, but monitoring tools are showing bursts of data on the link instead of a smooth and constant flow of data. They also notice that latency on the link is higher than
expected.
What would you advise them to do to make more efficient use of the link?
A. Create and activate more Replicator sessions
B. Use QoS to guarantee 140 MB/s of bandwidth for Replicator
C. Set the TCP fast timer to 500 ms
D. Set the TCP slow timer to 200 ms
A customer wants to implement file system replication between two EMC VNX systems. The source production file system contains data from a random workload that resides in a pool composed of SAS drives. Due to cost concerns, the destination file system and SavVol volumes will be placed on dedicated 2 TB NL-SAS drives.
What should you tell the customer about this configuration?
A. NL-SAS is only adequate if the source file system is on NL-SAS and contains a sequential application.
B. Replicator session performance will decrease because SavVol shares LUNs with user applications.
C. Only Flash and SAS drives should be used for Replicator SavVol volumes.
D. The destination file system can be used as a source for cascaded replication with no impact to performance.
A customer has two sites, with a VNX system at each site. The local site has four application LUNs of 256 GB each. They are replicated to the remote site with MirrorView/S. The link between the sites has an effective bandwidth of 100 MB/s. The application generates 800 random IOPS of 8 kB with a 3:1 R/W ratio on each of the LUNs. The link fails for 15 minutes.
How much data is copied to the secondary LUNs as part of the resynchronization process?
A. 1.4 GB
B. 22 GB
C. 44 GB
D. 88 GB
A customer has two sites, with a VNX system at each site. The local site has four application LUNs of 512 GB each. They are replicated to the remote site with MirrorView/S. The link between the sites has an effective bandwidth of 100 MB/s. The application generates 1,000 random IOPS of 4 kB with a 3:1 R/W ratio on each of the LUNs. The link fails for five minutes.
How much data is copied to the secondary LUNs as part of the resynchronization process?
A. 4.6 GB
B. 18.3 GB
C. 36.6 GB
D. 73.2 GB
A customer has two VNX systems: At the local site, a VNX capable of performing 10,000 LUN IOPS At the remote site, a VNX capable of performing 7,000 LUN IOPS
At the local site, application LUNs to be mirrored to the remote site perform 2,000 random 4 kB IOPS, with a R/W ratio of 4:1. At the remote site, application LUNs to be mirrored to the local site perform 1,200 random 8 kB IOPS, with a R/W ratio of 3:1. The utilization of both systems must be 70% or lower. MirrorView/A will be used to replicate the data. How much throughput can be performed by other applications at the local and remote sites?
A. Local: 3,200 IOPS; Remote: 1,300 IOPS
B. Local: 4,600 IOPS; Remote: 3,100 IOPS
C. Local: 5,600 IOPS; Remote: 4,100 IOPS
D. Local: 6,800 IOPS; Remote: 4,600 IOPS
A customer has two VNX systems: At the local site, a VNX capable of performing 20,000 LUN IOPS At the remote site, a VNX capable of performing 14,000 LUN IOPS
At the local site, application LUNs to be mirrored to the remote site perform 2,000 random 4 kB IOPS, with a R/W ratio of 3:1. At the remote site, application LUNs to be mirrored to the local site perform 1,200 random 8 kB IOPS, with a R/W ratio of 2:1. The utilization of both systems must be 70% or lower. MirrorView/A will be used to replicate the data.
How much throughput can be performed by other applications at the local and remote sites?
A. Local: 9,600 IOPS; Remote: 5,600 IOPS
B. Local: 16,800 IOPS; Remote: 10,800 IOPS
C. Local: 12,000 IOPS; Remote: 8,600 IOPS
D. Local: 18,000 IOPS; Remote: 12,800 IOPS
A customer wants to implement file system replication between two EMC VNX systems. The source production file system contains data from a sequential workload that resides in a pool composed of NLSAS drives.
The destination file system will be configured with a SnapSure schedule for data sharing. Due to cost concerns, the destination file system and SavVol volumes will also be placed on NL-SAS.
What should you tell the customer about this configuration?
A. Replicator session performance will decrease because of destination file system checkpoint reads.
B. NL-SAS is adequate if the source file system is on NL-SAS and contains a random application.
C. Only Flash and SAS drives should be used for Replicator SavVol volumes.
D. The destination file system can be used as a source for cascaded replication with no impact to performance.
You are planning for fracture granularity.
What granularity should you use to track updates to a 1 TB clone source LUN?
A. 64 KB
B. 128 KB
C. 256 KB
D. 512 KB
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