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Dell E20-526 Exam Practice Questions (P. 4)

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Question #16
Based on XtremIO Data Protection, how many dedicated hot spare disks per X-Brick are required?
  1. A
    0
  2. B
    1
  3. C
    2
  4. D
    3

Correct Answer:
A
XtremIO Data Protection (XDP) doesnt require any configuration, nor does it need hot spare drives. Insteadit uses "hot spaces" free space in the array.
References:
https://www.emc.com/collateral/white-paper/h13036-wp-xtremio-data-protection.pdf
, page 23

Question #17
When using XtremIO storage with Solaris (SPARC), what is the EMC recommended I/O size that will deliver sequential I/O more efficiently to XtremIO?
  1. A
    1 MB
  2. B
    2 MB
  3. C
    4 MB
  4. D
    8 MB

Correct Answer:
C
EMC recommended setting for Solaris include that the /etc/system file be modified to include the following parameter:
* Set maximum IO size
set maxphys = 0x400000
This also requires increase of the maximum I/O size for the disk driver. The corresponding entry and file for this change are different for different Solaris versions, as follows:
For Solaris 10 (SPARC):

File: /kernel/drv/ssd.conf -
Setting: ssd_max_xfer_size=0x400000;
For Solaris 10 (x86):

File: /kernel/drv/sd.conf -
Setting: sd_max_xfer_size=0x400000;
Etc.
References: EMC Host Connectivity Guide for Oracle Solaris, page 167 https://www.emc.com/collateral/TechnicalDocument/docu5132.pdf

Question #18
Which level of granularity does XtremIO deduplication run?
  1. A
    Variable 8 kB
  2. B
    Variable 32 kB
  3. C
    Fixed 8 kB
  4. D
    Fixed 32 kB

Correct Answer:
C
EMC XtremIO(All-Flash) : SAN, inline deduplication, 8K fixed chunk size;
References:
https://www.linkedin.com/pulse/deduplication-fake-reality-mike-uzan

Question #19
Which operation is performed when an XtremIO Snapshot is created?
  1. A
    Pointers to the ancestor metadata are created for the snapshot
  2. B
    Space equal to the size of the ancestor is allocated to the snapshot
  3. C
    A reserved space is created for new snapshot data
  4. D
    A deduplication pass is immediately run against the snapshot

Correct Answer:
A
When a snap is created, the following steps occur:
1) Two empty containers are created in-memory
2) Snapshot SCSI personality is pointing to the new snapshot sub-node
3) The SCSI personality which the host is using, is linked to the second node in the internal data tree
References: EMC RECOVERPOINT REPLICATION OF XTREMIO, Understanding the essentials of RecoverPoint Snap-based replication for XtremIO, page 8 https://www.emc.com/collateral/white-papers/h14296-wp-recoverpoint-replication-of-xtremio.pdf

Question #20
A storage administrator wants to add a volume to their XtremIO storage array using the RESTful API. Which RESTful method should be used to complete this task?
  1. A
    HTTP POST
  2. B
    HTTP PATCH
  3. C
    HTTP LINK
  4. D
    HTTP PUT

Correct Answer:
A
An example of a generic wrapper function that queries XtremIO REST API using HTTP/POST to create a new object with specified properties.

References: https://www.emc.com/collateral/white-papers/h14980-wp-accelerate-sql-lifecycle-management.pdf

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