On Mon, 30 May 2011, Itay wrote:

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?


The recipe has a problem in the vgcreate step (below,
marked with '***********').
The physical volume is not listed in /dev/disk/by-uuid/...

Can someone suggest how to fix the recipe, or suggest a different
workflow for working with lvm on hot-pluggable USBs?



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?


[snip]

Thanks,
Itay


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Hello,

2011/6/2 Itay <debian@itayf.fastmail.fm>


On Mon, 30 May 2011, Itay wrote:




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?




The recipe has a problem in the vgcreate step (below,

marked with '***********').

The physical volume is not listed in /dev/disk/by-uuid/...



Can someone suggest how to fix the recipe, or suggest a different workflow for working with lvm on hot-pluggable USBs?



Actually, you should be able to use the partitions directly to create the VG. An example that applies to your case is even in the manpage of vgcreate:
EXAMPLES


****** To create a volume group named test_vg using physical volumes /dev/sdk1, and /dev/sdl1 with default physical extent size of 4MB:

*********** vgcreate test_vg /dev/sdk1 /dev/sdl1



*Thus, as alternative to the vgcreate and vgextend steps, the following command should do it in a single step:
pvcreate myVG 7dev/sdc1 /dev/sdc2Regards,
Roland






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?




[snip]



Thanks,

Itay





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