New to lvm

[katie1]

on a test system i installed ux 11.xx

regarding LVM ... Is there a command to find all unused available physical discs in all vgs

or is one vg queried at a time

what is command to be used

is there a command to pvcreate multiple discs at once

or is pvcreate done one disk at a time


what is command to be used



when i find the free disks i want to create a VG so it can be used

these steps required



i have read docs on how to expand extend etc but i need info to start from scratch..preferably step by step,



feel free to answer in multiple posts as points will be asssigned to each post,,

regards KT1

[Torsten.]

Your questions are all very general, never specific.

>> on a test system i installed ux 11.xx

xx does matter!



You should use "vgdisplay -v ..." and "pvdisplay -v ..." to get this information.



Time to study the guides about LVM and hp-ux system administration!


http://www.hp.com/go/bsc

[Torsten.]

Point to start:

http://docs.hp.com/en/5992-6576/index.html

[James R. Ferguson · Accepted solution]

Hi:

The manpages for 'lvm(7)' offer a very good, quick overview of LVM commands, LVM concepts and some LVM examples:

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c02261079/c02261079.pdf

Regards!

...JRF...

[katie1]

unfortunately the questions are not specific as i am not well versed in the subject to ask precise questions ,
I do understand that can make it a little difficult to answer thanks to all, replies just what i needed a guide with examples

regards KT1

[Steven E. Protter]

Shalom,

Normally this is done via a simple script:

bdf | awk -F\/ '{ print $3 }' | sort -u |while read -r vgname
do
vgdisplay -v $vgname
done

You may need to hack at this a bit, but you can easily find the values you seek.

SEP

[katie1]

Thanks for the links,,much appreciated

As we speak i am reading Certified System Administrator by Ghori Ashgar which is good imho,,


i installed ux 11.31 on a rx2600

UX is installed on vg001 containing using one disk



I have read a few guides including the the most recent one posted by James but i cannot find answers to the queries below yes i have tried man pvcreate , and man vgdisplay etc,

but these options do not seem apparent,to me.



regarding LVM ... Is there a single command to find "all unused available physical discs in "all vgs" ?

or is one vg queried at a time i know how to query 1 vg at a time



is there a command to pvcreate multiple discs at once i know how to do one at a time

anyguide i have read so far seems to omit the above information perhaps there is no such option ?? or am I missing //misunderstanding something

regards kT1

[katie1]

shalom Sep, just read your response , will wrangle with that ,

regards
KT1

[James R. Ferguson]

Hi (again):

> UX is installed on vg001 containing using one disk

Standards dictate that the operating system boot disk in HP-UX is named 'vg00'. Use other volume groups for non-OS data. By keeping vg00 devoid of anything other than the standard HP-UX logical volumes you can easily backup and/or recover (with Ignite) and/or clone (with Ignite) your operating system.

> regarding LVM ... Is there a single command to find "all unused available physical discs in "all vgs" ?

Yes, "documentation". Aside from some more advanced methods to look for LVM metadata on a physical disk, you can't be sure of what constitutes "unused" physical volumes.

> or is one vg queried at a time i know how to query 1 vg at a time

Interrogating a volume group can show available extents within the physical volumes that comprise it but doesn't tell you about "unused" physical volumes on the server. Documentation does.

> is there a command to pvcreate multiple discs at once i know how to do one at a time

No, one 'pv_path' argument per 'pvcreate' is allowed as the manpages show. You can, however, do something as simple as:

# for DISK in c1t0d0 c1t1d0 c1t2do
> do
> pvcreate /dev/rdsk/${DISK}
> done

Regards!

...JRF...

[James R. Ferguson]

Hi (again):

If you parse the output of 'bdf' you will constrain yourself to seeing only volume groups with *mounted* filesystems on their logical volumes.

A much better way to interrogate active volume groups is:

# vgdisplay

or:

# vgdisplay -v

...without any further argument.

Regards!

...JRF...

[katie1]

Thank you all that certainly cleared things up nicely ,
and is certainly appreciated,

regards
KT1

[katie1]

solution provided..thanks all