On 15/01/2013 4:54 PM, Wojciech Puchar wrote:
# dd if=/dev/zero of=foo count=1 bs=10240000
1+0 records in
1+0 records out
10240000 bytes transferred in 19.579077 secs (523007 bytes/sec)
you write to file not device, so it will be clustered anyway by FreeBSD.
128kB by default, more if you put options MAXPHYS=... in kernel config
and recompile.
Even with hard drive write cache disabled, it should about one write
per revolution but seems to do 4 writes per second.
so probably it is not that but much worse failure.
Did you rest read speed?
dd if=/dev/disk of=/dev/null bs=512
dd if=/dev/disk of=/dev/null bs=4k
dd if=/dev/disk of=/dev/null bs=128k
As you mentioned the dd file tests were done UFS and not on raw device.
I will get those numbers for you.
Thanks,
Karim.
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