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Location: A “Multivendor Post” on using iSCSI with VMware vSphere
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| Started By | Thread Subject | Replies | Last Post | ||||
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| gallopsu | iSCSI RR IOPS w/ CX4 | 3 | Jan 19 2010, 10:14 AM EST by gallopsu | ||||
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Thread started: Jan 19 2010, 9:31 AM EST
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We did some testing and found that the only value that compared to the default value of 1000 was 1. Changing from 1 to 2 dramatically changed the results. If anyone can offer an explanation as to why this is, I would love to understand.
We tested the following values: 1,2,5,10,75,100,250,500,1000,4200. I will paste our results in a second post, ran out of room on this post. If you copy them to a text doc and change the extension to csv you can have a look. Based on our testing and the recent bug in 4U1 that changes the value to a random number…tough to recommend changing the IOPS value. Perhaps the IOMeter load I selected skewed the results. And if you had a well defined load (not random) there might be a value that works better than the default.
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| Daniel_Minto | MSCS with iSCSI | 0 | Dec 31 2009, 9:16 AM EST by Daniel_Minto | ||||
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Thread started: Dec 31 2009, 9:16 AM EST
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Folks, great post !!
One question though: on the first question about Round Robin ("Question 1: “When shouldn’t I configure Round Robin?”), you mentioned that RR shouldn't be used with MSCS, and that seems clear. But, does VMware support MSCS with iSCSI ? Their documentation, as far as I could see, says it's not. Thanks, Daniel Minto
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| durkinr | IO Operations Limit follow-up | 2 | Nov 17 2009, 3:20 PM EST by durkinr | ||||
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Thread started: Nov 16 2009, 5:51 PM EST
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I recently had this exchange with EqualLogic tech support about the IO Operations Limit:
"In regards to setting the iops to 3, In asking around on this , we do not have any documentation that specifically instructs to change this value to 3 . We do have a similar setting in RedHat that we have recommended changing to 300 . My lead has been in discussion with other L3 techs , the unofficial consensus is that 3 may be to low of a setting." If someone from Dell/EqualLogic could clarify what the correct setting should be, please post it here! Thanks, -Rob
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| durkinr | IO Operation Limit | 0 | Oct 6 2009, 4:26 PM EDT by durkinr | ||||
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Thread started: Oct 6 2009, 4:26 PM EDT
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I've set the IO Operations Limit to 3 on one of our volumes as mentioned in the post. Will this have any effect on real-world performance? It was a pain to type in the LUN ID in naa.xxxxxxxxxxxxx format. Any of you ESX geniuses have an easier way to enter the LUN ID?
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