topic Re: Using LVM in Operating System - Linux

Using LVM

TimDunton — Tue, 15 Aug 2006 07:28:48 GMT

Hi,

I'm running Redhat Fedora 2 on a DL360G4. I've run out of space and needed to increase the drives. I know I go increase the disks using HP Smart Array but how do I go about configuring Linux to see the new space. I presume I need to use LVM but how and is there anything I need to look out for?

Thanks

Tim

Re: Using LVM

Geoff Wild — Tue, 15 Aug 2006 07:31:31 GMT

Try:

http://www.tldp.org/HOWTO/LVM-HOWTO/lvm2faq.html

http://fedora.redhat.com/docs/fedora-install-guide-en/fc5/ch-disk-partitioning.html

Rgds...Geoff

Re: Using LVM

Steven E. Protter — Tue, 15 Aug 2006 07:38:37 GMT

Shalom,

LVM has a great gui for RH/Fedora.

Point and click and all features at the tip of your mosue.

A good way to learn and the commands are very similar to HP-UX where you posted your query.

SEP

Re: Using LVM

melvyn burnard — Tue, 15 Aug 2006 07:38:47 GMT

Thread posted in wrong forum, moved to more appropriate forum

Re: Using LVM

TimDunton — Tue, 15 Aug 2006 07:40:12 GMT

Thanks guys for such a quick response. I did notice that the Free PE/Size is quite low. Could that be a problem or is that just because the new disks have not be put in yet?

Alloc PE / Size 2165 / 67.66 GB
Free PE / Size 2 / 64.00 MB

Re: Using LVM

TimDunton — Tue, 15 Aug 2006 10:17:43 GMT

Any news guys?

Re: Using LVM

Manuel Wolfshant — Tue, 15 Aug 2006 19:29:41 GMT

You should post the output of pvdisplay, vgdisplay and lvdisplay before anyone could give you any more hints. Anyway, you definitely should read the links posted by Geoff. And after understanding the basics, use the GUI suggested by Steven , assuming it is available for your version of Fedora (which is rather old). If it is not available, you should start here: http://www.tldp.org/HOWTO/LVM-HOWTO/commontask.html and here
http://www.tldp.org/HOWTO/LVM-HOWTO/addpvstovg.html

DO NOT extend/reduce partitions (using resize2fs or equivalant tools) without having a backup !

Re: Using LVM

TimDunton — Wed, 16 Aug 2006 02:25:44 GMT

Thanks guys, here's the out put. I've not put the new disk in yet but using HP 6i RAID I'm planning to replace both disks with SCSI 140Gb U320s.

--- Physical volume ---
PV Name /dev/cciss/c0d0p2
VG Name VolGroup00
PV Size 67.72 GB / not usable 0
Allocatable yes
PE Size (KByte) 32768
Total PE 2167
Free PE 2
Allocated PE 2165
PV UUID lJB77l-E7xI-WX3I-kZun-eUcO-Ol0r-STeed8

[root@theabcconnection ~]# vgdisplay
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 67.72 GB
PE Size 32.00 MB
Total PE 2167
Alloc PE / Size 2165 / 67.66 GB
Free PE / Size 2 / 64.00 MB
VG UUID Rq9HwR-J9fS-AqEe-asTT-bpfV-fp93-HwStyC

[root@theabcconnection ~]# vgdisplay
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 67.72 GB
PE Size 32.00 MB
Total PE 2167
Alloc PE / Size 2165 / 67.66 GB
Free PE / Size 2 / 64.00 MB
VG UUID Rq9HwR-J9fS-AqEe-asTT-bpfV-fp93-HwStyC

[root@theabcconnection ~]# lvdisplay
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID 8mVYLW-QAuN-4S1Y-R5nf-J0Qa-DwRT-rcwgUP
LV Write Access read/write
LV Status available
# open 1
LV Size 65.72 GB
Current LE 2103
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:0

--- Logical volume ---
LV Name /dev/VolGroup00/LogVol01
VG Name VolGroup00
LV UUID nL2pfg-OrR4-FWjw-zzr1-w6jp-Y05e-ioEda8
LV Write Access read/write
LV Status available
# open 1
LV Size 1.94 GB
Current LE 62
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:1

Re: Using LVM

Manuel Wolfshant — Wed, 16 Aug 2006 18:23:35 GMT

It's rather obvious that /dev/VolGroup00/LogVol00 (65 GB) takes almost all of the 67 GB of the volume. In order to extend the size of the volume, you have to add another drive to it. http://www.tldp.org/HOWTO/LVM-HOWTO/addpvstovg.html has the answer.