[EMAIL PROTECTED] wrote:
On Mon, 27 Dec 2004 13:38:12 MST, Dark Shadow said:
I have three hard drives so I took a file from one and copied it to
the others and timed it
source drive /dev/hda Reiser3 Western Digital 40gb 7200rpm
target1 drive /dev/hdb Reiser4 Western Digital 80gb 7200rpm
target2 drive /dev/sda Reiser3 Seagate 160gb 7200rpm (SATA but still
same rpm as rest so it should be the same)
You may wish to run 'hdparm -T -t' on each drive and see what the *raw* speed
is. All drives are not created equal... ;)
This is correct. You should see negligible difference between the two
for large files on the same drive. Deletions however, see next email....
time cp ~/800mb.file /target1
real 0m41.409s
user 0m0.010s
sys 0m4.364s
time cp ~/800mb.file /target2
real 0m38.318s
user 0m0.017s
sys 0m5.627s
Similarly, you should try each one 3-5 times and get an average (for
starters, if you have more than 800M of memory, the second time around it
may all still be in cache, so the second time gets a hot-cache boost). It
may be useful to run the command once and *ignore* its times, and then
re-run the command 3 times and average those results (so all 3 times you
actually *use* start from the same "previous command just finished" cache state).
