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Balance/Tune across two sizes of FC class drives https://3parug.org/viewtopic.php?f=18&t=1002 |
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Author: | RitonLaBevue [ Thu Nov 06, 2014 2:05 pm ] |
Post subject: | Re: Balance/Tune across two sizes of FC class drives |
The best thing is maybe to create 3 CPGs regarding what you wait from your array: space or perf. 1 with only 900 GiB, 1 with only 450 GiB and the third one for IOs delivery mixing both FC sizes. |
Author: | hdtvguy [ Fri Nov 07, 2014 9:59 am ] |
Post subject: | Re: Balance/Tune across two sizes of FC class drives |
We had similar concern on our V400 when we went from 300FC drives to 900 SAS. We created a CPG for the 300G 15K FC, one for 900 GB SAS and then left the other for our 2TB NL. |
Author: | Davidkn [ Sat Nov 08, 2014 5:52 pm ] |
Post subject: | Re: Balance/Tune across two sizes of FC class drives |
There are lots of rules to follow when choosing disks for a 3par, it's a shame hp have kind of gone away from their greenzone rules as you knew exactly where you were with that, now you can go outside the rules and it can get you into trouble. I think it's also difficult to choose the right set size too, the system should recommend one for the number of disks you have and should also recommend how many disks you need to add to keep within what you currently have set up. The minimum ssds is because each disk type has a minimum number of disks when adding to an array, and when you have a 4 controller system you need the controller pairs to have the same disks available to them really, and you want to take advantage of raid and protection and you also can only install them in pairs in a disk shelf. So on a 4 node system the minimum number of disks of one disk type is 4. Sure I read the other day that they have changed the number recently though, fc, nl and ssd have different numbers. |
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