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software raid sucks: openbsd facts and figures

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Jonathan Walther (krooger@debian.org)
Tue, 22 Feb 2000 03:11:31 -0800 (PST)

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Be afraid. Be very afraid.

## Tue Feb 22 02:59:59 PST 2000
## by Jonathan Walther <krooger@debian.org>
##
## system:
## AMD Athlon 500 Mhz cpu
## 128M of PC100 ECC SDRAM
## Asus motherboard
## scsi:
## 4 9Gig IBM drives
## adaptec 2940UW controller
## software raid level 5
## ide:
## 13Gig Seagate
## operating system:
## OpenBSD 2.6

## The disk layout
$ df -k
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/wd0a 63167 18134 41875 30% /
/dev/wd0g 126671 4303 116035 4% /var
/dev/wd0h 12554718 870053 11056930 7% /usr
/dev/raid0g 25471725 202257 23995882 1% /mnt

## Size of the test file
$ ls -l t1
- -rw-r--r-- 1 root jwalther 206990128 Feb 21 14:22 t1

## Copy from the IDE drive to the IDE drive
$ time cp t1 t2
=> real 0m41.697s

## Copy from the IDE drive to the RAID drive
$ time cp t1 /mnt/t1
=>real 1m9.356s

## Copy from the RAID drive back to the IDE drive
$ time cp /mnt/t1 t3
=>real 0m16.519s

## Copy from the RAID drive to the RAID drive
$ time cp /mnt/t1 /mnt/t2
=> real 1m33.910s

## Raw read from the IDE drive
$ time cat t1 > /dev/null
=>real 0m11.245s

## Raw read from the RAID drive
$ time cat /mnt/t1 > /dev/null
=>real 0m11.263s

## Raw write to IDE drive
$ time dd if=/dev/zero of=t4 bs=1048576 count=200
=>real 0m16.156s

## Raw write to the RAID drive
$ time dd if=/dev/zero of=/mnt/t4 bs=1048576 count=200
=>real 1m4.095s

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This archive was generated by hypermail 2.0b3 on Tue 22 Feb 2000 - 11:10:13