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Raid 10 vs 15K SAS

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November 9, 2008 2:13:36 PM

I am going to upgrade my Transaction Processing Server (still running Window 2000 Server OS). It has extensive Read/Write operations from time to time. R/W performance (especially the write) is my top priority while reliability is the second priority (as I will still carry out scheduled backup daily). I do not know which would be the best configuration :(  :

Raid 10 using 4 SATA II 3.0Gb/sec HD (Intel Server board has onboard Raid 0, 1, 5, & 10) OR
a single 15K SAS HD

Please kindly give me some advise

Thanks a lot.

More about : raid 15k sas

a c 82 G Storage
November 9, 2008 3:16:38 PM

You could read , but bear in mind that the single drive he used is not a 15K SAS unit. Depending on the SATA drives that you'll use, a 15K SAS drive might be quicker, but not as safe. You could also check the "IOMeter File Server 1 I/O" benchmarks at .
November 9, 2008 5:00:05 PM

If you're not concerned with reliability, I think 4 drives in raid 0 would be the fastest for overall bandwidth. If you're doing a lot of small read/writes, though, the 15k drive would be better.
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a b G Storage
November 9, 2008 7:14:42 PM

For lots of I/O, you want the 15k. For fast sequentials, you want the RAID.
November 10, 2008 4:00:28 PM

Thanks for all the useful advises. I studied the benchmarks charts in Tom's Hardware. The IO Meter File Server benchmark of a single SAS drive (Seagate Cheetah 15K.5) is way out perform any RAID configuration:

Cheetach 15K.5 SAS HDD == 2075.03
RAID 0 (4 drives) == 960.18
RAID 10 (4 drives) == 812.23

For the sequential read and write, the RAID is better though:

Cheetach 15K.5 SAS HDD == 107.80 (Ave Read Transfer) / 104.70 (Ave Write Transfer)
RAID 0 (4 drives) == 302.20 (Ave Read Transfer) / 273.30 (Ave Write Transfer)
RAID 10 (4 drives) == 153.60 (Ave Read Transfer) / 154.80 (Ave Write Transfer)

However, for a more meaningful comparison, I want to know what kind of hard drives are being used in these RAID configuration for these benchmark tests. I looked around but there was no description for the hardware configuaration under the RAID Matrix Charts. Does anyone has the answers?

Thanks again.

a c 82 G Storage
November 10, 2008 7:09:02 PM

Click the Test Platform icon for details. They used "Samsung HD120IJ (120 GB 7,200 RPM, 8 MB Cache, SATA/300)" which are not as afast as newer SATA drives.
a b G Storage
November 10, 2008 9:51:19 PM

True, but even the latest SATA won't come close to matching a Cheetah for IO.
!