LVM in HPUX

[Vinayak_HPUX]

in HPUX LVM I am able to create PV using single raw disk as below
# pvcreate -f /dev/rdsk/c4t2d0
But below is not working
# pvcreate -f /dev/rdsk/c4t2d0 /dev/rdsk/c4t2d2 /dev/rdsk/c4t2d3
How to create the PV using multiple raw disk in HPUX whereas 2nd command is working in Linux but not in HPUX plz help ?

[Torsten. · Accepted solution]

You can run this command to a single device only - easy with cut'n'paste or a small script line.

[Johnny Damtoft]

I use a small script - like this:

Ref. url:
http://www.knowledgeroot.dk/hp-ux/lvm/creating-volume-group-and-logical-volume-with-distributed-and-pvg-strict/

# list=`xpinfo -d -l |awk -F, {'print $8" "$5" "$4" "$1'}| sed 's/\/dev\/rdsk\///g' |awk {'print $4'}`
# for i in $list
> do
> print "pvcreate /dev/rdsk/$i"
> done
pvcreate /dev/rdsk/c8t0d0
pvcreate /dev/rdsk/c9t0d0
pvcreate /dev/rdsk/c10t0d0
pvcreate /dev/rdsk/c11t0d0
pvcreate /dev/rdsk/c8t0d1
pvcreate /dev/rdsk/c9t0d1
pvcreate /dev/rdsk/c10t0d1

After i check the output, i just copy/paste. :)

-- Johnny Damtoft

[Rasheed Tamton]

pvcreate will initialize the disk, destroy the existing data on it. So care must be taken before you issue the pvcreate command. That might be the reason HP does not support more than one pv_path.

If you want more than one you can do something like this. But be sure about the device names.

for i in /dev/rdsk/c4t2d0 /dev/rdsk/c4t2d2 /dev/rdsk/c4t2d3
do
echo $i
pvcreate $i
done

[Torsten.]

BTW, I would NEVER use the "-f" to force the command unless it is really needed!

[Vinayak_HPUX]

Then what the use of LVM ? suppose one of my disk got full then I extended lv upto pv's size its ok.... but if still its not enough. then how to add new pv from different disk to old one?
let I have created PVs as below
pvcreate -f /dev/rdsk/c4t2d0
pvcreate -f /dev/rdsk/c4t2d2
pvcreate -f /dev/rdsk/c4t2d3

but how could I
add one PV to another when I need to extend lv in /dev/rdsk/c4t2d0 disk when this disk donot have space ?

[Torsten.]

"how to add new pv from different disk to old one?
let I have created PVs as below
pvcreate -f /dev/rdsk/c4t2d0
pvcreate -f /dev/rdsk/c4t2d2
pvcreate -f /dev/rdsk/c4t2d3"

Let's say your new LUN is

/dev/rdsk/c4t2d3

you run

pvcreate /dev/rdsk/c4t2d4

and add this PV to your VG using vgextend.
After this you can lvextend the LVOL.

[Jeeshan]

Then create pv

#pvcreate -f /dev/dsk/cxtxdx

#lvextend /dev/vgX/lv_X

then extend the size in file system

[Torsten.]

sorry, typo.

Let's say your new LUN is

/dev/rdsk/c4t2d4

you run

pvcreate /dev/rdsk/c4t2d4

and add this PV to your VG using vgextend.
After this you can lvextend the LVOL.


see also

http://docs.hp.com/en/B2355-90950/ch06s01.html

[Jeeshan]

sorry about last line

then mount the file system

[Rasheed Tamton]

You cannot directly put the PV in a LV on HP-UX. What you have to do is:

first you extend the VG belongs that LV by adding the new PVs.

i.e.,
if your LV is /dev/vg02/lvol1
and your new PV is /dev/dsk/c4t2d3

you first extend the vg02:
vgextend /dev/vg02 /dev/dsk/c4t2d3

Then extend the LV

lvextend -L 100000 /dev/vg02/lvol1

100000 = is the new size in MegaBytes. While you lvextend it MUST BE BIGGER THAN the old LV Size. You must note that existing LV Size before you extend the LV to a new size and it MUST BE BIGGER. Otherwise, you will lose the data.

[Torsten.]

Ahsan, please think about this again ;-)

"Then create pv

#pvcreate -f /dev/dsk/cxtxdx

#lvextend /dev/vgX/lv_X

then extend the size in file system"

Some steps are missing, right?

[YAQUB_1]

check this below URL site:-
http://forums12.itrc.hp.com/service/forums/questionanswer.do?threadId=1223722

[Sajjad Sahir]

Dear

To better understand lvm, I am defining the
three basic terms
physical volume
volume group
logical volume

physcial volume- is the actual physical volume disk drive
volume group: u can combine many physical volume to the volume group, means collection of physical volume is the volume group
logical volume: in the volume group u can create logical volume it is an are where u can create the file system.

how to create a logical volume
1. create a physical volume
2. create a volume group
3.create a logical volume
also u can extend the existing volume group
by adding new physical volume
ok
thanks and regards

sajjad

[Sajjad Sahir]

Dear
Please assign points who are answerign u thread otherwise u have to close u thread ASAP, if u are giving points to the peoples they will answer u thread ASAP, otherwise they will hesitate to answer u questions ok
take care, co-operate with team

thanks and regards

sajjad

[Vinayak_HPUX]

I got the solutions