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 Post subject: Re: 3Par Rookie - Need assistance in troubleshooting please.
PostPosted: Mon Jul 02, 2018 3:56 pm 

Joined: Wed Nov 08, 2017 8:57 am
Posts: 24
BryanW wrote:
Are you using AO, AFC or both for the 8 SSDs?
Was AO running when you saw the latency?

Also the first thing I would look for when there is unexplained LD/VV latency is run the "Physical Drive Compare by Performance" report for the same period and look for a failing physical disk

Absent a failing PD, it could be a few of things - reply with what you see


When trying to run any reports at all, it just sits and spins.. Never kicks out the report??


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 Post subject: Re: 3Par Rookie - Need assistance in troubleshooting please.
PostPosted: Mon Jul 09, 2018 3:14 pm 

Joined: Wed Nov 08, 2017 8:57 am
Posts: 24
So I'm having the issue right now.. Running some CLI commands and notice the .srdata VV pulling over 2,600 iops??

According to NinjaStars my (28) 900GB 10K drives in R5 only pull 3,112 total..

My SSD say 98,000 and the VV name for that is "VDIParentReplicas"..


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 Post subject: Re: 3Par Rookie - Need assistance in troubleshooting please.
PostPosted: Tue Jul 10, 2018 7:55 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 702
Location: Europe
So which commands are you running?

.srdata is the volume where all performance metrics are stored, so if you are looking at historical data it is expected that there is activity on .srdata and as always you want the response as quickly as possible so it will take what performance it can.


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 Post subject: Re: 3Par Rookie - Need assistance in troubleshooting please.
PostPosted: Tue Jul 10, 2018 8:09 am 

Joined: Wed Nov 08, 2017 8:57 am
Posts: 24
MammaGutt wrote:
So which commands are you running?

.srdata is the volume where all performance metrics are stored, so if you are looking at historical data it is expected that there is activity on .srdata and as always you want the response as quickly as possible so it will take what performance it can.


Thanks for the reply..

That particular command was statvv so I can see which VV are generating the most I/O.. When I was having the slowness issue, which lasted for hours, the total I/O was averaging between 3K-5K..


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 Post subject: Re: 3Par Rookie - Need assistance in troubleshooting please.
PostPosted: Tue Jul 10, 2018 9:26 am 

Joined: Wed Nov 08, 2017 8:57 am
Posts: 24
MammaGutt wrote:
In CLI, «statpd -rw», «statvv -rw -ni», «statvlun -ni -rw» and «statvlun -hostsum -ni -rw» should give you some pointers. If statvlun is high and statvv is low, your issue is 99% host or fabric issue. With and without hostsum can help you understand if it is volume or host related. If statvv is high, the latency is due to something internal on the 3PAR, if statpd latency is high, it is most likely a backend issue (not enough disks/SSD). Always remember that read iops (vlun and vv) is mostly read from disk (around 5-10msec) while write should hit cache (1-ish msec).


So are you saying when running these commands to focus and compare the Svt MS columns?

Thanks


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