Move Filesystem the VGx to VGy

[Eli Daniel]

good morning, I need your help

there is a filesystem

/ usr / sap / audit
LV: / dev/vgECCprodr5/lvsapaudit

must move to another VG
New VG: / dev / VGaudit / lvsapaudit

as I do? what are the commands to be executed?

[Patrick Wallek]

There's no easy way to move a LV between VGs other than to copy the data from one to the other.

[Eli Daniel]

no need to move the LV, only the FileSystem

/usr/sap/audit

[James R. Ferguson]

Hi:

You need to create your new filesystem within your new logical volume within your new volume group.

Then, mount the new (empty) filesystem and do:

# cd /srcdir && pax -r -w -pe . /dstdir

...where '/srcdir' is your old filesystem ('lvsapaudit') and '/dstdir' is your new one ('newlvsapaudit'). You could do this when the filesystems are not in use.

When you are done and satisfied, rename your new filesystem to be the old name and edit your 'etc/fstab'.

Regards!

...JRF...

[Eli Daniel]

In this case is to move the filesystem. create new VG. It creates new LV and moves filesystem / usr / sap / audit

[Johnson Punniyalingam]

>>>In this case is to move the filesystem. create new VG. It creates new LV and moves filesystem / usr / sap / audit<<

Yes, As mentioned by >>JRF

pvcreate /dev/rdsk/cxtxdx
mkdir /dev/VGaudit
mknod /dev/VGaudit/group c 64 0xMM0000
where MM is a unique identifier (ex 01 for vg01)
vgcreate -s 32 -n /dev/VGaudit (man vgcreate)
lvcreate -L /dev/VGaudit/lvsapaudit
newfs -F vxfs -o largefiles /newfs -F vxfs -o largefiles /dev/VGaudit/rlvsapaudit
add entry in the /etc/fstab for new created file system
mount new file system

than,you use method suggested by >JRF

or

Example :-
# export PATH=$PATH:/usr/sbin
# cd /var/opt/omni; fbackup -f - -i . | (cd /var/opt/omni2; frecover -f - -r)

important . pls perform all steps while taking downtime from "Sap Application"

[Patrick Wallek]

The issue is that the filesystem is contained within the LV.

There is no way to move the filesystem without moving the LV. And there is no way to move an LV between VGs.

You must copy the data to the new filesystem within the new LV.

[Eli Daniel]

creating a temporary filesystem copy the old files in the file system filesystem temporarily.
I think the new vg, lv and filesystem
I copy temporary files to the new filesystem??

it works?

LV need not move the file system only moving to a new VG

[Johnson Punniyalingam · Accepted solution]

>>I copy temporary files to the new filesystem??<<<

Yes It would work, we can do it , hence its referring to SAP application FS, you may need help of your app's team to give hand on pointing the new file system location in app's settings. that beyond "Sys Admin" role - it's just a suggestions from my side.

>>it works?<<

Yes It works

>>>LV need not move the file system only moving to a new VG<<

yes . only trick, copy of the data from old lv to new VG.(You use HPUnix command like .tar,cpio,fbackup,pax) or Any Backup Software like (HP Data protector )backup and restore

As suggested on above posts we can't move "lv" from one (VG) another (VG-New)

man pvmove for more information

[Raj D.]

Daniel,

>there is a filesystem
/ usr / sap / audit
LV: / dev/vgECCprodr5/lvsapaudit

must move to another VG
New VG: / dev / VGaudit / lvsapaudit



Ans:
A filesystem cannot be moved to another VG.
You have to create a new filesystem on the other VG , and copy the data.

Because the space can not be moved between VGs as they consists of different disks.

So the best way to do it,
- Check space requirement on the other VG.
- Create equal amount of filesystem with same filesystem naming like VGaudit/lvsapaudit
- newfs the lv, mount it, add in /etc/fstab if it is not under cluster.
- mount it.
- Copy the data using unix command , if you have rsync you can do it very well and it will faster and stable.
Ex: # rsync -avz /old_FS /new_fs/

- Once copy done , veryfy the size with source and you can unmount the source FS.

Cheers,
Raj.

[Eli Daniel]

ok, to complete the theme

backup data old fileSystem /usr/sap/audit (tar)
umount filesystem /usr/sap/audit

create new VG, LV and Filesystem:
LV: /dev/VGaudit/lvsapaudit
FileSystem: /usr/sap/audit
copy data to new FileSystem /usr/sap/audit

this correct?

[Patrick Wallek]

Yes, that looks good.

[Eli Daniel]

Thanks