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Enterprise Fast Drives - Would Raid level make a performance difference
Q:
I have 16 EFDs.
Would my configuring them in Raid 10 give me a better performance than Raid 5.
Kindly advice.
Regards.
Ragh
AnkitMehta
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September 12th, 2012 07:00
Performance is dependant on many factors.
In General, RAID 1+0 has Good R/W Performance and RAID 5 has Good Read Performance for sequential reads and fair for random and sequentials writes, also do not forget Write Penalty is High in RAID 5 as compared to RAID 1+0.
For Further information you may refer to below white papers:
EMC FAST Cache - A Detailed Review.
White Paper: EMC Unified Storage Best Practices for Performance and Availability: Common Platform and Block Storage 31.5 — Applied Best Practices
RRR
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September 12th, 2012 07:00
Oh EFD means Enterprise Flash Drive, not FAST.
dynamox
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September 12th, 2012 08:00
considering how expensive EFDs are , we try to squeeze as much usable capacity as possible so we go with the RAID config that gives us just that. Write penalty will be offset by pretty much non existent seek time on EFDs and just its superior IOPS.
AnkitMehta
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September 12th, 2012 08:00
I am aware Rob! It's just I threw in one more document, in case he is interested in configuring EFD's for FAST
RRR
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September 13th, 2012 05:00
I wasn't replying to you, was I? No offense ofcourse.
AnkitMehta
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September 13th, 2012 08:00
I don't see he mentioned EFD and FAST on the question but I do see that in my response! :S
Anyways, no biggy!
RFritz11
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September 17th, 2012 07:00
Hi,
I've moved this post to the Host Systems support forum where it can be further discussed.
Thanks.