I'd like to set up a USB drive using LVM. Could someone knowledgable
confirm that the following recipe should allow me to hot-plug the
USB drive without rendering the LVM file-systems inaccessible?
Many thanks.
Itay
Recipe follows:
Set up:
# (Actual number of partitions, etc., is not important here.)
# Assume attached disk is /dev/sdc and it has an extended partition
#+ that covers that whole disk.
# Prepare partitions for LVM (say, 2 partitions)
$ parted /dev/sdc mkpart logical START1 END1
$ parted /dev/sdc mkpart logical START2 END2
# Create Physical Volumes
$ pvcreate /dev/sdc1
$ pvcreate /dev/sdc2
# Identify the Physical Volumes' UUIDs
$ blkid
# Create Volume Groups using PVs **UUIDs**
$ vgcreate [options] myVG /dev/disk/by-uuid/UUID-OF-PART-1
$ vgexted [options] myVG /dev/disk/by-uuid/UUID-OF-PART-2
# From this point I can "forget" that I deal with a USB drive, and
#+ continue the set up as with built in drives; right?
Usage:
# (Based on advice here:
#
http://blogs.sourceallies.com/2009/12/unplugging-an-lvm-partitioned-usb-drive/
# )
# Before unplugging
$ umount /mnt/point/of/lvm
$ lvchange -an /dev/myVG
$ vgexport -a
# After plugging-in
$ vgimport -a
$ lvchange -ay /dev/myVG
$ mount [options] /mnt/point/of/lvm
# (Question: vgexport/import is needed if volume groups are identified
# by UUID?)
Thanks.
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