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 Post subject: A650 Limits
PostPosted: Fri Jun 04, 2021 9:09 am 

Joined: Wed Jun 13, 2018 2:31 am
Posts: 25
How do i findout if my A650 Array has reach its limits, and require an upgrade to A670 ?

or what is the trigger point i should stop introducing new workload to the array and get another array ?


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 Post subject: Re: A650 Limits
PostPosted: Mon Jun 07, 2021 8:31 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 1252
Location: Europe
JinSXS wrote:
How do i findout if my A650 Array has reach its limits, and require an upgrade to A670 ?

or what is the trigger point i should stop introducing new workload to the array and get another array ?

A very generic answer, when your latency increases.

Your problem is probably that by the time you notice the latency it's too late :)

Depending on know scared you are about this issue, HPE provide a performance analysis (paid service) where they will measure the load for multiple days/weeks and provide a detailed performance overview compared to assumed maximum performance of the system. Do one every X months to monitor how the load increases to get an understanding of when you need to stop scale up and start scaling out.

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 Post subject: Re: A650 Limits
PostPosted: Fri Jun 11, 2021 1:07 am 
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Joined: Tue Aug 18, 2009 10:35 pm
Posts: 1291
Location: Dallas, Texas
Good question.

The short answer is HPE created a saturation % metric in Infosight and SSMC to help you measure that.

The long answer is it depends. QoS can help maintain a required latency on certain hosts, while non-latency sensitive applications "take the hit" to mitigate saturation. Troubleshooting should be done to locate the performance bottleneck to confirm controller upgrade is the right answer, and its not something else, like SAN bottleneck, or improper zoning thats the cause.

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 Post subject: Re: A650 Limits
PostPosted: Fri Jun 11, 2021 9:58 am 

Joined: Wed Jun 13, 2018 2:31 am
Posts: 25
can controller CPU % be proper assessment too ?

yes i understand the saturation, is one key point...

cause somehow my 4N the node pair 0/1 seems to have 20 to 30% higher utilization compared with my pair 2/3

thats why i was wondering if im reaching the limits considering the CPU % on pair 0/1


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 Post subject: Re: A650 Limits
PostPosted: Fri Jun 11, 2021 10:58 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 1252
Location: Europe
JinSXS wrote:
can controller CPU % be proper assessment too ?

yes i understand the saturation, is one key point...

cause somehow my 4N the node pair 0/1 seems to have 20 to 30% higher utilization compared with my pair 2/3

thats why i was wondering if im reaching the limits considering the CPU % on pair 0/1


If all hosts are zoned to all nodes and all traffic is RR so all nodes have the same traffic I would log a case.

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