Which operation is performed when an XtremIO Snapshot is created?
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
How can REST API commands be run to manage and monitor an XtremIO cluster?
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/
A customer's storage administration team wants to receive e-mail notifications when the XtremIO cluster detects an issue of major seventy. The customer has successfully configured and tested the e-mail server in the XtremIO GUI. However, the e-mail server is not receiving the expected notifications when major severity issues appear.
What is the cause of this issue?
A customer is considering migrating their existing non-EMC storage arrays to an XtremIO array. The current environment consists of 350 servers running VMware ESXi 5.5 with 5000 virtual machines. The customer has various tools in place to monitor performance and collect statistics. On average, their service time is 32 ms and utilization is at 75%. In the past, the customer has had performance issues.
Based on Little's Law, what is the calculated response time on the existing environment?
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
A customer has a group of applications that need storage which can provide low response times. The total I/O requirements are 75,000 IOPs with a 4 kB block size. They will have 500 LUNs and need to keep 30 daily snapshots of each LUN.
What is the smallest XtremIO configuration that will meet their needs?
