On 03.31, Tim Harvey wrote:
> Greetings,
>
> I'm attempting to benchmark software RAID5 on a system with:
> - Promise SATAII150 TX4 card
> - 4 Segate ST3300831AS drives
> - custom built kernel 2.6.11 (to get driver for promise SATAIITX4)
> - FC3 install
> - EPIA M10000 mainboard, 256MB memory
>
> The tools I'm familiar with for benchmarking a PATA based RAID system are:
> - hdparm
> - dd
>
> Here are some interesting stats from my system:
>
Here goes my setup/results, FWIW...
Hard: Dual PIII@9333
2 Promise FastTrak S150 TX4 (rev 02)
6x Maxtor 7Y250M0, 250Gb, 3 on each card.
Soft:
> [root@epiam10k ~]# more /proc/mdstat
> Personalities : [raid5]
> md0 : active raid5 sdd1[3] sdc1[2] sdb1[1] sda1[0]
> 879100608 blocks level 5, 4k chunk, algorithm 2 [4/4] [UUUU]
>
> unused devices: <none>
nada:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5] [multipath] [raid6] [raid10]
md0 : active raid5 sdf1[5] sde1[4] sdd1[3] sdc1[2] sdb1[1] sda1[0]
1225557760 blocks level 5, 256k chunk, algorithm 2 [6/6] [UUUUUU]
unused devices: <none>
> [root@epiam10k ~]# hdparm -t /dev/sda
>
> /dev/sda:
> Timing buffered disk reads: 116 MB in 3.02 seconds = 38.45 MB/sec
> HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for
> device
> [root@epiam10k ~]# hdparm -t /dev/sda1
>
> /dev/sda1:
> Timing buffered disk reads: 104 MB in 3.05 seconds = 34.10 MB/sec
> HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for
> device
nada:~# hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 900 MB in 2.00 seconds = 449.84 MB/sec
Timing buffered disk reads: 172 MB in 3.03 seconds = 56.70 MB/sec
> [root@epiam10k ~]# hdparm -t /dev/md0
>
> /dev/md0:
> Timing buffered disk reads: 72 MB in 3.03 seconds = 23.79 MB/sec
>
nada:~# hdparm -tT /dev/md0
/dev/md0:
Timing cached reads: 912 MB in 2.01 seconds = 454.48 MB/sec
Timing buffered disk reads: 178 MB in 3.04 seconds = 58.60 MB/sec
> [root@epiam10k ~]# vmstat
> procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
> r b swpd free buff cache si so bi bo in cs us sy id wa
> 1 0 0 3628 8984 142704 0 0 423 23 1023 112 30 3 61 6
>
> Observations:
> - the performance of a raw SATA device (/dev/sda in the above example) seems
> low when I compare it to a PATA drive from a previous system (which would get
> about 45MB/sec)
> - the performance of the RAID5 array (/dev/md0) seems very low - I expect
> quite an increase over a single device due to striping
> - the number of interrupts per second (1023) seems very high
>
It is not marvelous in my case, but slightly better than yours...
--
J.A. Magallon <jamagallon()able!es> \ Software is like sex:
werewolf!able!es \ It's better when it's free
Mandrakelinux release 10.2 (Cooker) for i586
Linux 2.6.11-jam10 (gcc 3.4.3 (Mandrakelinux 10.2 3.4.3-7mdk)) #1
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