Re: Areca 1260 Performance (was: File Systems Compared)

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On 6-Dec-06, at 2:47 PM, Brian Wipf wrote:

Hmmm. Something is not right. With a 16 HD RAID 10 based on 10K rpm HDs, you should be seeing higher absolute performance numbers.

Find out what HW the Areca guys and Tweakers guys used to test the 1280s. At LW2006, Areca was demonstrating all-in-cache reads and writes of ~1600MBps and ~1300MBps respectively along with RAID 0 Sustained Rates of ~900MBps read, and ~850MBps write.

Luke, I know you've managed to get higher IO rates than this with this class of HW. Is there a OS or SW config issue Brian should closely investigate?

I wrote 1280 by a mistake. It's actually a 1260. Sorry about that. The IOP341 class of cards weren't available when we ordered the parts for the box, so we had to go with the 1260. The box(es) we build next month will either have the 1261ML or 1280 depending on whether we go 16 or 24 disk.

I noticed Bucky got almost 800 random seeks per second on her 6 disk 10000 RPM SAS drive Dell PowerEdge 2950. The random seek performance of this box disappointed me the most. Even running 2 concurrent bonnies, the random seek performance only increased from 644 seeks/sec to 813 seeks/sec. Maybe there is some setting I'm missing? This card looked pretty impressive on tweakers.net.

Areca has some performance numbers in a downloadable PDF for the Areca ARC-1120, which is in the same class as the ARC-1260, except with 8 ports. With all 8 drives in a RAID 0 the card gets the following performance numbers:

Card single thread write 20 thread write single thread read 20 thread read ARC-1120 321.26 MB/s 404.76 MB/s 412.55 MB/ s 672.45 MB/s

My numbers for sequential i/o for the ARC-1260 in a 16 disk RAID 10 are slightly better than the ARC-1120 in an 8 disk RAID 0 for a single thread. I guess this means my numbers are reasonable.



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