Displaying 1 result from an estimated 1 matches for "test_mirror".
Did you mean:
test_minor
2008 May 28
0
I/O performance problem using LVM mirrors to back phy: devices
...ed normally within the dom0, but performance dropped when
accessed via xm block-attach. This was, to our minds, ridiculous.
First, we created two logical volumes in the volume group "test":
one with mirroring and a mirror log and one with the --corelog option.
# lvcreate -m 1 -L 2G -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 ev...