Displaying 1 result from an estimated 1 matches for "bus_io_wait".
2008 May 28
0
I/O performance problem using LVM mirrors to back phy: devices
...-n test_mirror test
# lvcreate -m 1 --corelog -L 2G -n test_core test
Then we made filesystems and mounted them:
# mke2fs -j /dev/test/test*
# mkdir -p /mnt/test/mirror
# mkdir -p /mnt/test/core
# mount /dev/test/test_mirror /mnt/test/mirror
Next we started oprofile, instructing it to count BUS_IO_WAIT events:
# opcontrol --start --event=BUS_IO_WAIT:500:0xc0
--xen=/usr/lib/debug/boot/xen-syms-2.6.18-53.1.14.el5.debug
--vmlinux=/usr/lib/debug/lib/modules/2.6.18-53.1.14.el5xen/vmlinux
--separate=all
Then we ran bonnie on each device in sequence, stopping oprofile and
saving the output each...