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| cpg query and space https://3parug.com/viewtopic.php?f=18&t=1095 |
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| Author: | waugh [ Tue Dec 30, 2014 2:57 am ] |
| Post subject: | cpg query and space |
cpg query I have 2 CPG. -t r1 -p -devtype FC -t r5 -p -devtype FC showspace -t r5 -p -devtype FC ---Estimated(GB)---- RawFree UsableFree 100 50 showspace -t r1 -p -devtype FC ---Estimated(Gb)---- RawFree UsableFree 100 75 As per my understanding the whatever the Raid group it will pullout the space from FC disk. Now suppose i have to do the capacity planning then which space I need to consider here which given by raid group r5 or r1. How to calaculate it. Regards, Waugh |
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| Author: | MDPlatts [ Tue Dec 30, 2014 10:34 am ] |
| Post subject: | Re: cpg query and space |
This should have gone in your other thread related to the same topic. But if you have a R5 3+1 config then you get 75% of available space as usable space - hence the available 100gb becomes 75gb usable. R1 is 1+1 so you only get 50% so 100gb available becomes 50gb usable. R5 4+1 would be 80% and R5 5+1 would be 83% but I suspect you have insufficient shelves to do these - hence it seeming to use R5 3+1. How you calculate it depends on how you intend to present/preserve your data as virtual volumes - e.g. which CPG you put the VV into. HP/3PAR best practice is R5 (R1 is a bit faster but not worth it usually) but if you only have 2 shelves then R1 is really the only option to survive the loss of one shelf. |
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