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PERC 5/i RAID Card: Tips and Benchmarks - Page 333

post #3321 of 7150
incase a drive fails so i know which one to pull
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post #3322 of 7150
Hello guys,

I finally have all the stuffs to begin the benchs :

- a PERC 5/i
- 4 x Savvio 15K.1 73 GB
- the cable

So as I just got the cable today, I started my benchs in the evening.

I first started the tests with 2 virtual disks, compound each with 2 disks in RAID0.

The performances on my computer look like these :

READ - RAID0 with the 2 first Savvio 15K.1 :


READ - RAID0 with the 2 others Savvio 15K.1 :


WRITE - RAID0 with the 2 first Savvio 15K.1 :


WRITE - RAID0 with the 2 others Savvio 15K.1 :


Then I have deleted these two virtual disk to create another one with the 4 Savvio 15K.1 together set in RAID0. What I am looking for is the best performance, I don't care about security

I then launched some benchs and I have to say that I'm kind of disappointed by the results :

READ - RAID0 with the 4 Savvio 15K.1 :


WRITE - RAID0 with the 4 Savvio 15K.1 :


As you can see, the benefit of having 4 HDD in RAID0 isn't valuable (based on the average) :
- between 20-25 MB/s of benefit in READ
- about 70 MB/s of benefit in WRITE

I'm wondering if I don't have forgotten any setting in MegaRAID Storage Manager

My PERC 5/i is running the LSI 7.0.1-0061 firmware and I don't have any BBU.

Do you think my results are relevant or am I doing something wrong?

Any help would be greatly appreciate
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post #3323 of 7150
How fast is an individual drive?
post #3324 of 7150
I didn't test on my system, but according to an Tom's Hardware review the transfer rates are the following :

Read Transfer Rates


Write Transfer Rates


To summarize, for the Savvio 15K.1 :
- READ : 91.7 MB/s (average)
- WRITE : 91.1 MB/s (average)
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post #3325 of 7150
Quote:
Originally Posted by mimidatabase View Post
To summarize, for the Savvio 15K.1 :
- READ : 91.7 MB/s (average)
- WRITE : 91.1 MB/s (average)
What's your stripe size?
post #3326 of 7150
Here's the ATTO style benchmark (from IOmeter) of my 8 x 1.5TB RAID-6 array on a Perc 6/i. It's slower than the 6 x 1.5TB RAID-5 array on a Perc 5/i with .5K, 1K, and 2K reads, but is faster everywhere else (look at the numbers, not the length of the bars).

8 x 1.5TB RAID-6 array (Perc 6/i):


6 x 1.5TB RAID-5 array (Perc 5/i):


I never tested the 6 x 1.5TB RAID-5 array on the Perc 6/i, so I'm not sure if the performance loss is from the RAID level, or the RAID card.
post #3327 of 7150
Quote:
Originally Posted by stereodude View Post
what's your stripe size?
64k
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post #3328 of 7150
Quote:
Originally Posted by mimidatabase View Post
64k
Try a larger stripe size and see what happens. Also make sure the array isn't doing anything in the background, like a background initialize.
post #3329 of 7150
Ok, I'll try a larger stripe size tonight.

About the initialization, I launched it just after the build of the RAID0, so I guess there is only one initialization and no additional initialization is launched in background, am I wrong?

Thanks
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post #3330 of 7150
Quote:
Originally Posted by mimidatabase View Post
Ok, I'll try a larger stripe size tonight.

About the initialization, I launched it just after the build of the RAID0, so I guess there is only one initialization and no additional initialization is launched in background, am I wrong?

Thanks
It initializes when the array is first made, but it can be set to do so in the background. If you didn't realize that and immediately tried to start benchmarking it, you'd get slow results.
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