[linux-lvm] tps for block device vs lvm device
unlisted
unlisted at gmail.com
Fri Aug 8 01:04:52 UTC 2008
Why would I see 50x the amount of transactions on the lvm volume vs the
actual underlying block device ?
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 11.41 57.07 0.00 31.51
Device: tps MB_read/s MB_wrtn/s MB_read MB_wrtn
sda 211.33 0.00 56.12 0 113
sdb 268.47 63.05 0.00 128 0
dm-0 14365.52 0.00 56.11 0 113
dm-1 0.00 0.00 0.00 0 0
sdc 0.00 0.00 0.00 0 0
211 tps versus 14365 tps. The box is idle and the following command was
running:
dd if=/dev/sdb of=/home/xxxxxxx/bigrandomfile.txt bs=4k count=10000000
Sam
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