Hard Drive Performance

funbags · 11-12-2005, 08:02 PM

Hey all! I just fired up my first Raid 5 setup today.

Did a 3ware card with 3 400 GB drives. I'll have pictures which i took during the install later on my website, i'll let you know once i upload them.

But anyways, I didnt tweak anything yet. What do you think of these results so far?

Code:

 
fileserver:/raiddrive/files# hdparm -Tt /dev/sda

/dev/sda:
 Timing cached reads:   3956 MB in  2.00 seconds = 1978.30 MB/sec
 Timing buffered disk reads:  268 MB in  3.01 seconds =  88.90 MB/sec

Good / Bad / OK ?

Regards
- John

btmiller · 11-12-2005, 11:48 PM

Seems pretty good compared with the older hardware I have around. We'd need the exact specs of the card and the drives, though, to really say much more than that.

Keruskerfuerst · 11-13-2005, 04:50 AM

go to to kernel kernel-raid mailing list.

Hdparm does not measure the performance of a Raid system.

funbags · 11-13-2005, 10:31 AM

Hello,

Ok Yes, I have been reading that. What would you suggest to measure the performance.

I ran tiotest - below

Code:

fileserver:/raiddrive/files# tiotest -f 25 -d /raiddrive/files/xbox
Tiotest results for 4 concurrent io threads:
,----------------------------------------------------------------------.
| Item                  | Time     | Rate         | Usr CPU  | Sys CPU |
+-----------------------+----------+--------------+----------+---------+
| Write         100 MBs |    3.4 s |  29.225 MB/s |   1.4 %  |  57.2 % |
| Random Write   16 MBs |    8.3 s |   1.893 MB/s |   0.0 %  |   2.3 % |
| Read          100 MBs |    0.3 s | 343.696 MB/s |   1.7 %  |  96.9 % |
| Random Read    16 MBs |    0.0 s | 332.723 MB/s |   6.4 %  |  91.6 % |
`----------------------------------------------------------------------'
Tiotest latency results: