[linux-lvm] LVM Questions

Nicholas Muguira Nicholas.Muguira at iongeo.com
Thu Mar 27 22:27:07 UTC 2008

I am trying to judge the ability of LVM to address a problem I currently
have, and I have few questions:


1)       Is there a way to configure LVM so that the data on remaining
PV's in a VG are is accessible after a PV fails?

2)       Is there a way to configure LVM so that the LV will still be
accesible and readable/writable if a PV fails while in use?

3)       Assuming groupings of external drives, can a LV be created and
exported on each group of the same name and then imported into different
systems. For example assuming 10 drives, drives a-e are in group 1 and
drives f-j are in group 2. Using System A with drives a-e connect to
/dev/sda-e create a parittion that spans the entire drive for each
drive. Create a PV on each partition (/dev/sd[a-e]1). Create a VG named
test with all partitions (/dev/sd[a-e]1). Create a LV that covers all of
the VG test. Mount the LV and format it (ext3 in this case). Umount and
vgexport the vg test. Repeat the steps with drives f-j with same VG and
LV names. Connect group 1 to System B and vgimport VG test, create LV
with it and mount the filesystem. Umount the filesystem and disconnect
group1. Connect group 2 to System B and vgimport VG test and mount the
filesystem (using LV previously created)?


Raid is unavailable due to already deployed hardware, and I realize that
LVM is not Raid and will not give me a means to recover the data on the
failed HDD.



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