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Thinking about RAID 5

F

fentzinator

Limp Gawd
Joined
Sep 8, 2002
Messages
193
Running RAID 0 now with two 74 WD Raptors. I do have a third 74 raptor and was considering doing a Raid 5 with all three. Will write performance suffer significantly? Does this sound like a good idea or should I stay with my RAID 0? Thanks
 
fentzinator said:
Running RAID 0 now with two 74 WD Raptors. I do have a third 74 raptor and was considering doing a Raid 5 with all three. Will write performance suffer significantly? Does this sound like a good idea or should I stay with my RAID 0? Thanks
Click to expand...

The benchmarks I've seen put the RAID-5 about 10MB/sec slower than the RAID-0.
But look at the redundancy you gain.

Others (Oracle has a whitepaper) recommend RAID 0+1 or 10 over RAID-5, but that takes 4 drives.

Doug's posts on this says that RAID-5 is actually faster for the single user and the RAID 0+1 or 10 is faster for the multi-user server which sees a lot of requests.

Look through the threads....the topic comes up fairly often.

 
About writes suffering...

If you use hardware based XOR cards, yes.

If you use software based XOR cards, HELL yes.

-Larry

fentzinator said:
Running RAID 0 now with two 74 WD Raptors. I do have a third 74 raptor and was considering doing a Raid 5 with all three. Will write performance suffer significantly? Does this sound like a good idea or should I stay with my RAID 0? Thanks
Click to expand...
 
rodsfree said:
The benchmarks I've seen put the RAID-5 about 10MB/sec slower than the RAID-0.
But look at the redundancy you gain.

Others (Oracle has a whitepaper) recommend RAID 0+1 or 10 over RAID-5, but that takes 4 drives.

Doug's posts on this says that RAID-5 is actually faster for the single user and the RAID 0+1 or 10 is faster for the multi-user server which sees a lot of requests.

Look through the threads....the topic comes up fairly often.

Click to expand...
RAID-5 is faster in media storage with sequential reads and writes, not desktop application productivity, with random localized reads/writes. RAID-5 is for data, not Windows and programs. A RAID-0+1 setup will blow away a RAID-5 setup in application performance.

The write performance of a RAID-5 array will be abyssmal, equal to or less than a single drive, so yes write performance will suffer "significantly." Three drive RAID-5 should deliver read performance that is about the same as two disk RAID-0.

RAID only protects uptime, not data. It will not save the data on your Raptors from the most likely causes of loss. Investing in a third Raptor to protect uptime on a desktop is a waste of money, IMO, especially when you consider that you gain no capacity and take a loss on performance. You probably reformat periodically anyway.
 
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