How to Easily Pass the EMC E20-526 Exam: Expert Advice

Disk service time T(s) = 32 ms (service time for one I/O).

Response time T(r) is calculated as: T(s) / (1 – Utilization), which here calculates to 32 ms/ (1-0.75) = 128 ms.

References:https://community.emc.com/thread/145100?tstart=0

Proceed with filesystem aging by doing random overwrite cycles.

References:https://docs.openstack.org/juno/config-reference/content/XtremIO-cinder-driver.html#xtremio-management-ip

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

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

IDC outlines a criteria some criteria for selecting a testing tool:

* Generate workloads

* Capture results for analysis:

Throughput

IOPS

Latency

Etc.

References:http://info.xtremio.com/rs/xtremio/images/IDC_Flash_Array_Test_Guide.pdf

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 you’ll 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 don’t have a valid certificate installed), and -s (silent) to stop curl displaying it’s 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/

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