The Latest DELL-EMC E20-526 Dumps from PassLeader with VCE and PDF (Question 16 – Question 20)

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Which SCSI instructions are used to build a bitmap of the changes between the first snapshot and subsequent snapshots when RecoverPoint is used with XtremIO?

A.    SCSI Delta
B.    SCSI Transfer
D.    SCSI Update

Answer: C
DIFF protocol – A vendor specific SCSI command which RecoverPoint uses to query XtremIO with in order to obtain a bitmap of changes between two snapshot sets. RecoverPoint uses the output of DIFF command to read the actual data and transfer it to the target side.

A customer has a workload with the following attributes:
* Generates 250000 IOPs
* 100 TB in logical capacity
* Read/Write ratio of 1:1
* Random workload with 8 KB I/O size
* Deduplication ratio of 2:1
* Compression ratio of 2:1
Which XtremIO solution should be recommended to the customer?

A.    120 TB X-Brick
B.    240 TB X-Brick
C.    360 TB X-Brick
D.    480 TB X-Brick

Answer: C
XtremIO clusters with 60 TB of physical usable flash capacity can now logically support 360 TB or more of capacity at typical 6:1 data reduction (deduplication plus compression) ratios. Here we have a 4:1 reduction ratio, so 25 TB would be enough. The 250000 IOPs requirment indicates that we need at least two Bricks.

When using a 10 TB single X-Brick, what is the minimum amount of data that should be written during the Fill phase of the PoC Toolkit?

A.    10 TB
B.    15 TB
C.    20 TB
D.    30 TB

Answer: C
Per IDC’s best practices the toolkit fills the array 2x.

A customer is considering a six brick dispersed cluster using 360U racks. The customer wants advice on racking the InfiniBand switches.
* Rack 1 (left) contains X-Bricks 1 and 2
* Rack 2 (middle) contains X-Bricks 3 and 4
* Rack 3 (right) contains X-Bricks 5 and 6
Which recommendation should be provided?

A.    Install the InfiniBand switches in Rack 1 with a 1U placeholder between the switches.
B.    Install an InfiniBand switch in Racks 1 and 3 with a 1U placeholder between the X-Bricks.
C.    Install the InfiniBand switches in Rack 2 with a 1U placeholder between the switches.
D.    Install the InfiniBand switches in Rack 3 with a 2U placeholder between the switches

Answer: B

An administrator receives an error on an XtremIO array while performing snapshot refreshes to a production volume. What is a potential cause for this issue?

A.    Refresh of the production volume is not supported.
B.    Volume was not unmapped on the XtremIO cluster.
C.    Only snapshot-to-snapshot refresh is supported.
D.    Volume was not unmounted on the host.

Answer: D
The workflow for refreshing XtremIO Snapshots, containing Oracle Database files, consists of the following five simple steps:
1. Shut down the database instances with files in the target Snapshot Set.
2. Dismount the ASM disk group (or file systems) involved.
3. Refresh the Snapshot via XtremIO GUI (or CLI or RESTful API).
4. Mount the ASM disk groups (or file system) involved.
5. Start the database instances.
This entire workflow is measured in seconds (not minutes).
Not A: The refresh command is a powerful tool for test and development environments and for the offline processing use case. With a single command, a snapshot of the production volume or CG is taken and the SCSI face of the volume, which was mapped to the test and development application, is moved to it. This allows the test and development application to work on current data without the need to copy data or to rescan. (page 8)

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