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01-27-2010 05:13 AM
01-27-2010 05:13 AM
EVA4400 Performance Monitor output
We think our backup system overloads our EVA4400 SAN. At least, we think it is overloading one of the controllers in which a failover happens and the entire SAN crashes.
I'm currently watching EVAPerf and look at the value 'Read Requests' on all instances (hosts ports FP1/FP2 on both controllers.
What i see is that sometimes one of our ports jumps to 100% utilization, at least... that's what EVAPerf tells me.
How to i have to read this output? Does 100% say it cannot accept any requests anymore and it will queue all other incoming requests?
Regards,
Joris
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01-27-2010 05:40 AM
01-27-2010 05:40 AM
Re: EVA4400 Performance Monitor output
In host por statistiscs (EVAperf hps)
You get:
- Read Req/s
- Read MB/s
- Read Latency (ms)
- Write Req/s
- Write MB/s
- Write Latency (ms)
- Av. Queue Depth
You should look at the latencies.
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01-27-2010 05:56 AM
01-27-2010 05:56 AM
Re: EVA4400 Performance Monitor output
We normally have four backup queue's running and they cause serious shit every night. Today i started one and noticed during the progress it runs up to 100% utilization for a long period.
Does this mean this port is for a 100% utilized?
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01-27-2010 06:19 AM
01-27-2010 06:19 AM
Re: EVA4400 Performance Monitor output
The performance of the EVA is limited mainly by the type and amount of disks in the disk group. An EVA 4400 has 4 x 4 Gb/s ports, and it's very unlikely that you can saturate a fiber channel port.
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01-27-2010 06:23 AM
01-27-2010 06:23 AM
Re: EVA4400 Performance Monitor output
The y-axis in the graph goes from 0 to 100, that's why i tought the output would be placed in percents.
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01-28-2010 03:50 AM
01-28-2010 03:50 AM
Re: EVA4400 Performance Monitor output
How can i determine the maximum utilization of my EVA setup for e.g. controller processor time, host port utilization etc?
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01-29-2010 03:44 AM
01-29-2010 03:44 AM
Re: EVA4400 Performance Monitor output
If you got it in % you do not use evaperf.exe direct, you are using Windows Perfmon I think and this says you nothing.
You have to look under the Graph where Perfmon is showing the Values.
Read Req/s are the Disk IO's.
Calculate around 100 IO's for every 10k Disk Drive, this will be the max. IO for your EVA.
Then compare it to the max Value comming from Perfmon.
But If you are running Backup, IO's might not be the interesting Value, I would look at MB/s.
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