Dell E20-526 Exam Actual Questions

When using the XtremIO PoC Toolkit, what is the purpose of the Age phase?

Correct Answer: D 🗳️
Proceed with filesystem aging by doing random overwrite cycles.

A user attempts to create a quorum disk for a host cluster. Volume parameters are:
✑ Size = 1000 kB
✑ Name 1MB_Vol
However, the volume creation fails. What caused the process to fail?

Correct Answer: B 🗳️
The volume size must be specified in MB, GB, TB, and not in KB.
Incorrect Answers:

D: Quorum disks on XtremIO -
The SAN Volume Controller cluster will select disks that are presented by the XtremIO storage system as quorum disks. To maintain availability for the cluster, ideally each quorum disk should reside on a separate disk subsystem.
The quorum device can be any disk device that is shared between two or more nodes. EMC Symmetrix, VNX series, or XtremIO devices are commonly used for this purpose.
References:
https://vcdx133.com/2014/09/14/emc-xtremio-provisioning-a-lun/

You have been asked to design an XtremIO storage array solution that will be used for two large applications workloads. One overload will generate approximately
150,000 write IOPs with an average 4 kB I/O size. The second write workload will have an average I/O size of 128 kB and will generate approximately 2 GB/s of throughput.
At a minimum, how many X-Bricks are needed in a single cluster to meet this requirement?

Correct Answer: A 🗳️
Second write workload IOPS = 2 GB/s divided by 128 kB = 2 x 1,073,741,824 / (128 x 1,024) = 16384 IOPs.
Total IOPS required would be 150,000, from the first workload, plus 16384, totaling 166384.
A 2 X-Brick cluster provides 300K Read/write IOPS so it would be adequate.
Storage capacity and performance scale linearly, such that two X-Bricks supply twice the IOPS, four X-Bricks supply four times the IOPS, six X-Bricks supply six times the IOPS and eight X-Bricks supply eight times the IOPS of the single X-Brick configuration.
Note: 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

How can REST API commands be run to manage and monitor an XtremIO cluster?

Correct Answer: C 🗳️
The XtremIO's RESTful API allows HTTPS-based interface for automation, orchestration, query and provisioning of the system. With the API, third party applications can be used to control and fully administer the array.
Normally you would access the API using some form of programming/scripting language, such as Python or Perl. However for the purposes of learning or testing concepts there are a number of tools that work better, such as HTTPRrequester and curl.
* Curl is a command-line tool that exists in all Linux distributions, and is available for most other Unix OSes as well as Windows.
To use curl to access XtremIO youll need to pass it a few options, such as the username/password to access the array (any valid account on the XtremIO XMS will work), the URL of the API, and potentially a few options such as -k to tell curl not to validate the SSL certificate (presuming you dont have a valid certificate installed), and -s (silent) to stop curl displaying its progress as it downloads the response.
* HTTPRequester is a browser extension that is available for both Chrome and Firefox.
As with for curl, you’ll need to provide a username/password, which is done by clicking on the "Authentication…" box, which adds two boxes below the URL for the username and the password.

References:
https://blog.docbert.org/using-the-xtremio-rest-api-part-1/