search for: test_mirror

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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...