Here's a data point in favor of raw horsepower when considering
software raid performance. I recently upgraded an Athlon Slot-A/SDRAM
system to an Athlon XP/DDR system without changing OS, disks,
disk controller or filesystems.
Athlon K7 (18u) @ 840MHz, 1GB PC133, Abit KA7
---------------------------------------------
abit,1500M:4k,,,12862,36,11132,18,,,44953,32,284.0,1,,,,,,,,,,,,,
abit,1500M:4k,,,13132,36,10231,17,,,57147,40,278.2,1,,,,,,,,,,,,,
abit,1500M:4k,,,12595,36,11039,18,,,51269,36,281.6,1,,,,,,,,,,,,,
Athlon XP 2800 @ 2075MHz, 1GB PC2700, Asus A7V400-MX
----------------------------------------------------
abit,1500M:4k,,,41065,52,14636,15,,,49355,23,429.3,1,,,,,,,,,,,,,
abit,1500M:4k,,,41330,58,15932,16,,,47045,22,415.7,2,,,,,,,,,,,,,
abit,1500M:4k,,,43364,73,15395,17,,,52025,25,418.0,1,,,,,,,,,,,,,
test: bonnie++ v1.03 (-q -s 1500:4k -r 0 -n 0 -f -u root -x 3)
array: RAID 5 (2xIBM-DTLA-307020, 1xMAXTOR 6L020J1)
md partition: 3x10GB (last 1/2 of each 20GB disk)
controller: 3ware 6400, PATA, 66MHz (JBOD)
filesystem: ext3, 4k block size, stride=16, noatime,data=ordered
OS: RedHat 7.3, stock 2.4.28, raidtools 1.00.2, glibc 2.2.5, gcc 2.96
# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid5]
read_ahead 1024 sectors
md0 : active raid5 sdc5[2] sdb5[0] sda5[1]
4192768 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
md1 : active raid5 sdc6[2] sdb6[0] sda6[1]
2425600 blocks level 5, 32k chunk, algorithm 2 [3/3] [UUU]
md2 : active raid5 sdc7[2] sdb7[0] sda7[1]
12707200 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
md3 : active raid5 sdc8[2] sdb8[0] sda8[1]
20113152 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
# fdisk -l
Disk /dev/sda: 255 heads, 63 sectors, 2501 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 45 257040 82 Linux swap
/dev/sda3 46 2500 19719787+ 5 Extended
/dev/sda5 46 306 2096451 fd Linux raid autodetect
/dev/sda6 307 457 1212876 fd Linux raid autodetect
/dev/sda7 458 1248 6353676 fd Linux raid autodetect
/dev/sda8 1249 2500 10056658+ fd Linux raid autodetect
Disk /dev/sdb: 255 heads, 63 sectors, 2501 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 13 104391 83 Linux
/dev/sdb2 14 45 257040 82 Linux swap
/dev/sdb3 46 2500 19719787+ 5 Extended
/dev/sdb5 46 306 2096451 fd Linux raid autodetect
/dev/sdb6 307 457 1212876 fd Linux raid autodetect
/dev/sdb7 458 1248 6353676 fd Linux raid autodetect
/dev/sdb8 1249 2500 10056658+ fd Linux raid autodetect
Disk /dev/sdc: 255 heads, 63 sectors, 2498 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 * 1 13 104391 83 Linux
/dev/sdc2 14 43 240975 82 Linux swap
/dev/sdc3 44 2498 19719787+ 5 Extended
/dev/sdc5 44 304 2096451 fd Linux raid autodetect
/dev/sdc6 305 455 1212876 fd Linux raid autodetect
/dev/sdc7 456 1246 6353676 fd Linux raid autodetect
/dev/sdc8 1247 2498 10056658+ fd Linux raid autodetect
Cheers,
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