[linux-lvm] Cleanly removing a PV from an LV or, how do I get more available extents?
Bharat Mediratta
bharat at menalto.com
Sat Jul 17 21:49:19 UTC 2004
I've been happily using LVM for a couple of months now to aggregate a
bunch of disks together into one logical drive for a Debian box that I
use as an over-the-network backup of my various other boxen. Thus far,
it's been great.
Recently however, I started getting parity errors on one of the drives
that's in my logical volume. It's a tiny drive that I threw in there
merely because I had it, and its loss will not be missed. I just want
to remove it altogether and pretend like it never existed. I'd like to
preserve the data that's on the drive, if possible, but if not -- I'm ok
with losing it, since that data will come back next time I run my backups.
I read the FAQ, the HOWTO and scanned the mailing list archives and it
appears that I need to do a pvmove to get the data off of that drive,
and then a vgreduce to remove it from the volume group. Unfortunately,
when I try to do the pvmove, I get:
% pvmove /dev/sdb
No extents available for allocation
I'm assuming that this means that there's nowhere to move the data that
is on /dev/sdb. I further assume this means that I need some free
physical extents somewhere. This is where I'm confused. When I set up
LVM, I allocated all of my spare drives to it. So I have a 271GB
logical volume of which I'm using only 32GB. So I know that I have free
space to move the data around; I just don't know how to do it.
So. How do I get more free physical extents inside my logical volume?
I feel confident that there's an easy answer for this that I overlooked,
but I can't find it. Hopefully the context below will help a bit.
Thanks in advance,
-Bharat
================================
% lvdisplay
--- Logical volume ---
LV Name /dev/data/data1
VG Name data
LV UUID abrnMJ-2MqB-tkQl-g8g6-xYXx-KLE8-PMbNdG
LV Write Access read/write
LV Status available
# open 1
LV Size 275.19 GB
Current LE 70448
Segments 4
Allocation inherit
Read ahead sectors 0
Block device 254:0
% vgdisplay
--- Volume group ---
VG Name data
System ID
Format lvm2
Metadata Areas 4
Metadata Sequence No 8
VG Access read/write
VG Status resizable
MAX LV 255
Cur LV 1
Open LV 1
Max PV 255
Cur PV 4
Act PV 4
VG Size 275.19 GB
PE Size 4.00 MB
Total PE 70448
Alloc PE / Size 70448 / 275.19 GB
Free PE / Size 0 / 0
VG UUID PjytLd-X99E-iUTf-drKH-42dl-2QHO-6qBcmB
% pvdisplay
--- Physical volume ---
PV Name /dev/sda
VG Name data
PV Size 34.20 GB / not usable 0
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 8755
Free PE 0
Allocated PE 8755
PV UUID q8ElTG-XOoB-nQy6-8VTU-wZlR-uj3b-Vrnxlp
--- Physical volume ---
PV Name /dev/sdb
VG Name data
PV Size 8.55 GB / not usable 0
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 2189
Free PE 0
Allocated PE 2189
PV UUID dDZOFg-nQES-cCgO-l5KF-9JIz-i2hh-OpcP1V
--- Physical volume ---
PV Name /dev/sdc
VG Name data
PV Size 34.25 GB / not usable 0
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 8768
Free PE 0
Allocated PE 8768
PV UUID B8dtE3-gdB7-aakQ-p4EY-CysX-b6VU-LrBYmc
--- Physical volume ---
PV Name /dev/hde7
VG Name data
PV Size 198.19 GB / not usable 0
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 50736
Free PE 0
Allocated PE 50736
PV UUID bz31lu-ck6I-439l-IbWs-hb40-g6rm-rWE3oq
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