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A customer has decided to use VMware Horizon View as their desktop virtualization technology. Their VDI environment will consist of XtremIO storage and ESXi hosts. They are looking for increased speed and low latencies while performing file copy operations.
What should the setting for VAAI XCOPY I/O size be set to in order to achieve this requirement?
- A. 8 kB
- B. 63 kB
- C. 256 kB
- D. 4 MB
Answer : C
Explanation:
The VAAI XCOPY I/O size of 256 kB gives the best performance. 4 MB is the default value.
References: https://www.emc.com/collateral/white-papers/h14279-wp-vmware-horizon- xtremio-design-considerations.pdf, page 57
A customer has a large ESX server environment they are considering deploying to XtremIO for a VDI implementation. To determine a baseline of the environment, you are proceeding with documenting each servers CPU, NIC, and disk utilization statistics. The customer has provided you with direct CLI access to the servers to conduct this assessment.
Which utility should be used to monitor these performance parameters?
- A. esxtop
- B. resxtop
- C. top
- D. iostat
Answer : B
Explanation:
resxtop is a command to retrieve performance statistics. This command is included in vSphere command line interface (CLI) and is part of the vSphere Management Assistant
(vMA), which is an equivalent to esxtop that runs only inside an ESX service console.
What is considered typical performance for an XtremIO single X-Brick cluster?
- A. Small block writes: 200k-250k IOPs. Large block reads: up to 2.5 GB/s
- B. Small block writes: 200k-250k IOPs. Large block writes: up to 2.5 GB/s
- C. Small block reads: 200k-250k IOPs. Large block writes: up to 2.5 GB/s
- D. Small block reads: 200k-250k IOPs. Large block reads: up to 2.5 GB/s
Answer : C
Explanation:
Choose an EMC XtremIO system and scale out linearly by adding more XtremIO X-Bricks.
References: https://store.emc.com/en-us/Product-Family/EMC-XtremIO-Products/EMC-
XtremIO-All-Flash-Scale-Out-Array/p/EMC-XtremIO-Flash-Scale-Out
Which actions are initiated when a snapshot is created on an XtremIO array?
- A. Parent object becomes read only and two auxiliary volumes are created
- B. Parent object remains writeable and one auxiliary volume is created
- C. Parent object remains writeable and two auxiliary volumes are created
- D. Parent object becomes read only and one auxiliary volume is created
Answer : A
Explanation:
When a copy is created, the volume's existing metadata becomes an "ancestor" entity
(parent object) that is shared between the production volume and the copy. New empty containers are created for subsequent changes to both the production volume and the virtual copy volume. Therefore, the act of creating a copy is instantaneous and involves no data or metadata copies.
References: https://www.emc.com/collateral/white-paper/h13035-wp-introduction-to- xtremio-snapshots.pdf, pages 18
A customer has recently deployed an XtremIO 20 TB two X-Brick cluster to run an existing instance of Oracle RAC previously leveraging VNX for back-end storage. The application environment uses a block size of 1 MB. Multiple tables are in use with the
PARALLEL_DEGREE_POLICY variable set to AUTO.
The customer wants your help with tuning the DB_FILE_MULTIBLOCK_READ_COUNT parameter for best performance with XtremIO. Which values should be recommended for tuning the DB_FILE_MULTIBLOCK_READ_COUNT parameter in the Oracle RAC environment?
- A. 8 or 16
- B. 24 or 32
- C. 64 or 128
- D. 256 or 512
Answer : C
Explanation:
Oracle Database performs I/O on data files in multiples of the database block size
(db_block_size), which is 8KB by default. The default Oracle Database block size is optimal on XtremIO. XtremIO supports larger block sizes as well. In the case of multiblock I/O (e.g., table/index scans with access method full), one should tune the Oracle Database initialization parameter db_file_multiblock_read_count to limit the requests to 128KB.
Therefore, the formula for db_file_multiblock_read_count is:
db_file_multiblock_read_count = 128KB / db_block_size
In our case the block size is 1 MB, so the formula db_file_multiblock_read_count is 1 MB/
8KB = 1024/8 = 128
References:https://www.emc.com/collateral/white-papers/h13497-oracle-best-practices- xtremio-wp.pdf, page 21
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