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тАО01-23-2007 09:32 AM
тАО01-23-2007 09:32 AM
Sometimes I am forced to use only one diskgroup because of the advantages of disk space and ....
What happens to the performance when Vraid1 and Vraid5 are mixed within the same diskgroup?
Solved! Go to Solution.
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тАО01-23-2007 01:37 PM
тАО01-23-2007 01:37 PM
SolutionI don't know how you found out about different chunk size, in my opinion EVA virtualize this feature and prevents user to configure it.
The 2 major differences I can tell you are:
1. You have more chances to loose whole VDisk when one of the disks fails in DiskGroup.
2. Performance is better in RAID0 because it has less data to write compare to RAID5 (it has parity) and RAID5 has overhead of creating the parity using the RAID5 algorithm.
Hope this helps.
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тАО01-23-2007 05:08 PM
тАО01-23-2007 05:08 PM
Re: Vraid1 and Vraid5
It is hard to make blank performance statements. Imagine this:
- assume an aligned 4-chunk write
-- VRAID-1 needs to write out 8 chunks (4D+4D)
-- VRAID-5 calculates the parity chunk and writes out 5 chunks (4D+P)
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тАО01-23-2007 09:10 PM
тАО01-23-2007 09:10 PM
Re: Vraid1 and Vraid5
Assume you have 80 disks in one DG; all LUNs are striped across all 80 disks, IOs are optimally disributed and all disks are equally busy.
If you divide the same 80 disks into 2x 40 disk DGs there is a higher chance for inbalance since either the R1 or the R5 DG is more busy and you cannot utilize the full available backend performance!
So as a rule of thumb: less but larger DG are better for performance!
Cheers
Peter
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тАО01-24-2007 08:39 AM
тАО01-24-2007 08:39 AM
Re: Vraid1 and Vraid5
I once had an EVA training and the instructor insisted many times not to mix Vraid1 and Vraid5 within the same Disk Group. Obviously he was wrong, always double check your sources. Well from now on, m gonna follow the instructions for best performance, specially if i have different disk sizes and speed and types.
Thank you!!