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 [EMAIL PROTECTED] 2 Promise FastTrak S150 TX4 (rev 02) 6x Maxtor 7Y250M0, 250Gb, 3 on each card. Soft: > [EMAIL PROTECTED] ~]# 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> > [EMAIL PROTECTED] ~]# 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 > [EMAIL PROTECTED] ~]# 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 > [EMAIL PROTECTED] ~]# 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 > [EMAIL PROTECTED] ~]# 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/