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
cpg query and space
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.
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.