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тАО11-04-2007 10:23 PM
тАО11-04-2007 10:23 PM
we are examining the ├в Microsoft Performance Monitor├в output from the EVA data monitoring service on the SMA server in order to try to understand intermittent I/O transaction timeouts which are causing problems. We have some questions about the output from the monitor and the configuration of the eva 4000
1. Where do the queues whose depths are being displayed for each path actually reside ├в are they internal to the controllers?
2. Are the numbers we are seeing in this spreadsheet reasonable or do they indicate stress?
3. Is there any intelligence in the queue management, or is it just FIFO? In other words, is there any intelligence acting on queue entries which might schedule them out of the order in which they were received?
4. Would it be possible to get some sort of statement regarding the maximum performance one could expect from the controllers for different block sizes?
5. Can we configure the devices so that certain operations go to a specific controller while others go to the opposite controller? If this I possible, is it recommended by hp?
Solved! Go to Solution.
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тАО11-05-2007 01:23 AM
тАО11-05-2007 01:23 AM
Re: HP EVA 4000 Performance Monitoring - Questions
The queues displayed are the controller port queues.
>>> 2. Are the numbers we are seeing in this spreadsheet reasonable or do they indicate stress?
Last information I got is that EVA can handle a queue depth up to 2048 for each port.
>>> 3. Is there any intelligence in the queue management, or is it just FIFO? In other words, is there any intelligence acting on queue entries which might schedule them out of the order in which they were received?
I owe you that.
>>> 4. Would it be possible to get some sort of statement regarding the maximum performance one could expect from the controllers for different block sizes?
Hard to say and depends of the environment. Stress test is the best option.
>>> 5. Can we configure the devices so that certain operations go to a specific controller while others go to the opposite controller? If this I possible, is it recommended by hp?
Yes. You can set a preferred path on both, the storage controller serving the disk, and the HBA path in a multipath host.
From the csv output, it looks like your controllers cpu utilization is normal, data % and cpu% are close which is good.
Also, it looks like you are using a pure "round robin" algorithm for load balancing, this can lead in a lot of "proxy I/O" which can reduce the performance.
Also, I can see some "spikes" up to 200 MB/s. This is the bandwidht a 2Gbps SAN can provide.
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тАО11-05-2007 01:37 AM
тАО11-05-2007 01:37 AM
Re: HP EVA 4000 Performance Monitoring - Questions
Re q3) Is there any documentation on queue scheduling?
Re q4) Is there an HP stress test utility?
Re) Is there any an HP document on setting the preferred controller path and hba path?
thanks Simon
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тАО11-05-2007 02:30 AM
тАО11-05-2007 02:30 AM
SolutionAgain I owe you that
>>> Re q4) Is there an HP stress test utility?
Please see:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50460&locale=en_US
>>> Re) Is there any an HP document on setting the preferred controller path and hba path?
This is done in Command View EVA, selec the vdisk, presentation, and there you can set the controller preference.
From the host side, depends of the multipath software used.
Have a nice day.
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тАО11-05-2007 05:40 AM
тАО11-05-2007 05:40 AM
Re: HP EVA 4000 Performance Monitoring - Questions
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тАО11-05-2007 02:11 PM
тАО11-05-2007 02:11 PM
Re: HP EVA 4000 Performance Monitoring - Questions
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тАО11-06-2007 01:06 AM
тАО11-06-2007 01:06 AM