Kenneth Culver wrote:
but then why does read/write tests over raw devices performs so bad?
AFAIK on raw devices not filesystem, journaling, caches, etc are involved.
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Like I said before, you might not have been testing the throughput of the disks,
instead you may have been testing the throughput of /dev/zero.
I woluld like to have the throughput of /dev/zero on my disks. :-)
# dd if=/dev/zero of=/dev/null bs=1024k count=1024 1024+0 records in 1024+0 records out 1073741824 bytes transferred in 3.414659 secs (314450672 bytes/sec)
I'm redirecting this thread to current@ because something seems broken.
GNU/Linux 2.4.18 with ext2: 56848 K/sec FreeBSD 5.3b7 with default fs: 26347 K/sec FreeBSD 5.3b7 with default fs(async): 26566 K/sec FreeBSD 5.3b7 ata raid0* (two disks): 26131 K/sec FreeBSD 5.3b7 geom stripe* (two disks): 30063 K/sec FreeBSD 5.3b7 geom stripe** (four disks): 31891 K/sec OpenBSD 3.5 UFS fs: 55277 K/sec
* Each disk of the raid had a throughput of approx. 15000 K/sec ** Each disk of the raid had a throughput of approx. 7500 K/sec Each disk of the raid split the throughput by half.
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