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MSA 2050: Read Cache, how to check if it works?

 
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vp72b35a5
Occasional Visitor

MSA 2050: Read Cache, how to check if it works?

I installed a 960GB SSD disk, to the pool I added a disk group, type "read cache". no problem. but also no apparent benefit.
I did some short tests but I didn't see any improvements, probably because the cache on the controllers is already sufficient.
is there any way to have (GUI, SNMP, CLI, ...) information about the operation of this disk? a hit cache, or something?

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Re: MSA 2050: Read Cache, how to check if it works?

If you have configured read cache then this is related to read performance only. If you try to write in this array then you may not see any significant improvement.

So it depends upon what and how you are testing performance for this array.

You can install IO meter which will virtually create load on the array for testing purpose.

You can get many videos to learn the use of IO meter.

http://www.iometer.org/doc/downloads.html

You can refer below link to get some idea as well,

https://administrator.de/forum/performance-messung-iometer-storage-348765.html

 

Hope this helps!
Regards
Subhajit

I am an HPE employee

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mauro viola
Occasional Contributor

Re: MSA 2050: Read Cache, how to check if it works?

Thanks.
I tried with the IOMeter tool: so I saw a significant increase in performance. As the cache gets populated, the results get better and better.
The IOPs were initially less than 5k, now more than 40k.

However, I expected there to be something at the managemnt console level that would inform me of the status.
It is not a big deal.

Solution

Re: MSA 2050: Read Cache, how to check if it works?

You can refer Page 136 of MSA2050 SMU guide which talk about Performance,

https://support.hpe.com/hpesc/public/docDisplay?docId=a00017707en_us

If this is not helping then only option 3rd party tool like IO meter.

As this is entry level Storage box of HPE so this much only designed and available.

 

Hope this helps!
Regards
Subhajit

I am an HPE employee

If you feel this was helpful please click the KUDOS! thumb below!

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vp72b35a5
Occasional Visitor

Re: MSA 2050: Read Cache, how to check if it works?

Actually in the bottom line of the GUI, I found a small "Tier IOPS" chart that informs me about the use of the cache.
For everyone's benefit, the latencies detected by ESXi on the use of storage have fallen by 90%. Impressive.

Obviously the result depends a lot on the use made of it, but in my case it was very high.

Re: MSA 2050: Read Cache, how to check if it works?

@vp72b35a5  do you have any update or outstanding query?

Request you to please update on the forum so that everyone can get the update who are all following.

If you have no further query and you are satisfied with answers then kindly mark the forum as resolved.

 

Hope this helps!
Regards
Subhajit

I am an HPE employee

If you feel this was helpful please click the KUDOS! thumb below!

**********************************************************************


I work for HPE
Accept or Kudo