Hi JF, You can always partition the second disk, create a small partition and put the mlog in there, for example: # pvcreate /dev/sdb[12] # vgextend rootvg /dev/sdb[12] # lvcreate -L 10G -n mirroredvolume rootvg /dev/sda # lvconvert -m1 /dev/rootvg/mirroredvolume /deb/sdb1 /dev/sdb2
Check with: # lvs -ao +devices but this setup is not recommended, at least for me. i recommend 3 disks to create a LVM mirror. What if the /dev/sdb disk fails? You loose the information and the mirror log. To be honest I don't recomend you lvm mirror, it is only helpful when you have hardware failures. The system won't boot if you have a missing disk in the LVM, you will need to rely on a rescue disk. No sense if you work remote. My recommendation for two disk setup is to use pure MD devices. Plus you will gain in performance because it reads in parallel and as far as I understand LVM2 raid 1 does not. Just my two cents. Eng. Andres Migliazzo
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