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#1 (**permalink**) 01-05-2008, 07:21 AM

Can anybody out there remember how to reslice disks and volumes. Our
support people all claim to have forgotten (I never knew)

The problem:

Digging around in smit I think our current configuration is:

Physical disk hdisk4
Volume group vold3
Logical volume lvd3
File System d3

We have a single "spare" disk in the system mounted as /d3 - I need to
reslice this into two partitions and remount them as /d3 and /eht (for
example)

i can find where to rename /d3 to /eht, but cannot figure out how to
slice
out a new area.

I am sure I am missing a step as I go thru smit and I cannot figure out
how
to achieve this. I would like somebody to give me a step by step to do
this guide if possible

Many thanks EHT

#2 (**permalink**) 01-05-2008, 07:21 AM

A Volume Group ( VG ) consist of 1 or more hdisks.

A VG holds 1 or more Logical Volumes (LV). which hold normaly a
Filessystem ( FS)

So for your problem:
Find out the name of the VG which contains a FS that is mounted as /d3

# lsfs /d3 | tail -1 | cut -f3 -d"/" | xargs lslv | grep GROUP

You will see something like:
$ LOGICAL VOLUME: lv01 VOLUME GROUP: datavg

Now check if you have enough free space in that VG
# lsvg datavg
and look for .... FREE PPs:

If yes:
# smitty chfs
and use the VG name where to place the new FS.

If not: Reduce the LV which holds /d3 - but this is another story wich
depends pretty much of your OS level.

Also i still hope that you do not use an old smitty on an old SUN
machine because your writing sounds to an SUN Admin.

hth
Hajo

#3 (**permalink**) 01-05-2008, 07:22 AM

Hajo Ehlers wrote:
> A Volume Group ( VG ) consist of 1 or more hdisks.
>
> A VG holds 1 or more Logical Volumes (LV). which hold normaly a
> Filessystem ( FS)
>
> So for your problem:
> Find out the name of the VG which contains a FS that is mounted as /d3
>
> # lsfs /d3 | tail -1 | cut -f3 -d"/" | xargs lslv | grep GROUP
>
> You will see something like:
> $ LOGICAL VOLUME: lv01 VOLUME GROUP: datavg
>
> Now check if you have enough free space in that VG
> # lsvg datavg
> and look for .... FREE PPs:
>
> If yes:
> # smitty chfs
> and use the VG name where to place the new FS.
>
> If not: Reduce the LV which holds /d3 - but this is another story wich
> depends pretty much of your OS level.
>
> Also i still hope that you do not use an old smitty on an old SUN
> machine because your writing sounds to an SUN Admin.
>
> hth
> Hajo

Thanks for the reply, but the file system appears to be the full volume
which is why I need to trash it and reconfigure from scratch - it is a
spare disk so I don't mind doing this. I just don't want to
accidentally trash the other 4 disks - (users get really upset!)

The machine is IBM e30 - I am just an aging unix hack that has got fed
up with "professionals" saying it cannot be done.

oslevel 4.3.1.0

lv = lvd3 Total PP's 544
vg = vold3 Total PP's 546 Free 1

You appear to say I need to reduce the LV size, I cannot see a way to
do this thru smit?

#4 (**permalink**) 01-05-2008, 07:22 AM

In the old days a reduce means - recreate ;-)

If you do not care about the data:

#umount your FS mounted on /d3
umount /d3

# remove the FS with the mount point /d3. The rmfs will remove the FS
and the underlying LV
rmfs /d3

# Now a lsvg vold3 should show 545 free PP's . One PP is used normaly
for the JFS log.
lsvg vold3

# Now recreate the filesystem with the size of 1 PP ( We will not care
about the LV names ) or if you know the final size replace the 1 with
the amount of 512BytesBLock
crfs -v jfs -g vold3 -a size=1 -m /d3 -A yes
crfs -v jfs -g vold3 -a size=1 -m /d4 -A yes
mount /d3
mount /d4
# or use 'smitty crfs' .
Afterwards you should be able to increase the FS /d3 /d4 with
chfs -a size=NewSizeIn512BytesBlock /d3
chfs -a size=NewSizeIn512BytesBlock /d4

hth
Hajo

#5 (**permalink**) 01-05-2008, 07:22 AM

absolutely spot on! I can understand and have done this - Many thanks
for your help

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Reslicing disks