So I have a 7200 with 28 10K FC disks.. The low IOPS threshold is 150 while the high is 250.. NinjaStar has it getting 3,000 I/O. All VV are RAID5..
We've had performance issues with this san in the past so I'm often times SSH'd into it just monitoring it while doing other things..
The other day I happen to clance over while "statvlun -hostsum -ni -sortcol 3,dec" is running and I see one VV over 4,400 read I/O per second..
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I find someone kicked off a backup during the day and the VM was on this VV doing all the I/O.. The question I have is.. How did this pull that much I/O over what the tool says the SAN can even handle? I monitored it for a good 45 minutes and it was consistently that high with peaks up at 7,000..
When we've had issues in the past and the I/O shot up like this, the entire SAN and all VMs came to a crawl until we stopped what was going on.. This time, the performance impact wasn't even that bad..
Can someone explain this to me please? Thanks much!!
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Along these lines.. I setup a threshold alert to alert me when this SAN goes over 4,000 IO and I never got an alert? Is my threshold not configured right or what?
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