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 Post subject: Can you see VAAI stats on the array ?
PostPosted: Fri Mar 01, 2019 4:47 am 

Joined: Tue Mar 29, 2016 9:32 pm
Posts: 88
Hi there,

Is there an SR command that shows XCOPY throughput on the array ?
- Where ESX offloads copying datablocks from volume to volume to the array

Thanks!


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 Post subject: Re: Can you see VAAI stats on the array ?
PostPosted: Fri Mar 01, 2019 8:13 am 

Joined: Wed May 07, 2014 1:51 am
Posts: 249
Hi, I was looking for something like this as well.

There is a column "Wrt_Same_Zero (KB/s)" delivered by srstatrcopy that sounds like something VAAI'ish, but that's not explained in the clihelp, and it's probably not what you are looking for...

If you want to find peaks in vaai usage, look for peaks in backend without a corresponding peak in front end or vlun statistics :evil:

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 Post subject: Re: Can you see VAAI stats on the array ?
PostPosted: Fri Mar 01, 2019 11:08 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 842
Location: Europe
Not seen this either.

Not sure what someone would call this if it was collected either...... "Avoided SAN traffic"? And even better, how would you measure it (as it tend to come in peaks)? kB? kB/s? MB/hour? MB/day?

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 Post subject: Re: Can you see VAAI stats on the array ?
PostPosted: Sun Mar 03, 2019 8:22 am 

Joined: Sat Jan 07, 2017 3:50 am
Posts: 29
an other way to find out if vaai or in this case xcopy is doing some havy load is to check the single round trip response via the system reporter and put some alerts on it so that you will be informed when somebody did start Xcopy. Ofcourse only applicable when your data is replicated.


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