topic Creating a volume group .... in Operating System - HP-UX

Creating a volume group ....

Manuales — Sun, 28 Jan 2007 18:44:11 GMT

Hi ..
i need to create a vg ... how can i do that?
after that
i need to create lv's ...how can i do that?
after that
i need to activate vg's and lv's .. how can i do that?

and after that
how can i mount all that lv's?

Regards.

Re: Creating a volume group ....

Patrick Wallek — Sun, 28 Jan 2007 19:20:32 GMT

Read the documentation.

To create a VG use the command vgcreate

To create an LV use the command lvcreate

To activate a VG use the command vgchange

To mount the first time use the command mount
To mount when the system reboots you must modify /etc/fstab.

Each of those commands has a man page that you should review.

Other useful documentation is available here:

From the "Managing Systems and Workgroups: A Guide for HP-UX System Administrators" manual available here:
http://docs.hp.com/en/B2355-90950/index.html

Have a look at "Chapter 6 Administering a System: Managing Disks and Files":
http://docs.hp.com/en/B2355-90950/ch06.html

If you would rather have the manual in a PDF file:
http://docs.hp.com/en/B2355-90950/B2355-90950.pdf

Re: Creating a volume group ....

Manuales — Sun, 28 Jan 2007 19:25:51 GMT

how can i see free space on disk?

for using vgcreate .. how can i know if some disk is free for being used?

Thanks.

Re: Creating a volume group ....

James R. Ferguson — Sun, 28 Jan 2007 20:44:20 GMT

Hi Manuales:

> how can i see free space on disk?

You can use 'vgdisplay vgname' to determine the in-use (allocated) and free disk extents available in a volume group. A 'pvdisplay /dev/dsk/cXtYdz' shows the allocated and free extents on a physical volume.

> for using vgcreate .. how can i know if some disk is free for being used?

You cannot execute 'vgcreate' using a physical disk that is already a part of a volume group. Physical disk that are part of a volume group are recorded in '/etc/lvmtab'. The absence of a physical disk from '/etc/lvmtab' or from the devices listed when doing 'vgdisplay -v' *_may_* mean that the physical disk is free to use. Only good documentation guarantees that the disk is truly re-usable, though, since the physical disk may be being used as a raw device or it may have been 'vgexport'ed, thereby removing it from a volume group recorded in the '/etc/lvmtab'.

Regards!

...JRF...

Re: Creating a volume group ....

Cem Tugrul — Tue, 30 Jan 2007 03:57:21 GMT

Hi Manuales,
Here are some useful docs...
Good Luck,

Re: Creating a volume group ....

Cem Tugrul — Tue, 30 Jan 2007 04:08:18 GMT

another doc..
Good luck,

Re: Creating a volume group ....

Yogeeraj_1 — Tue, 30 Jan 2007 07:57:53 GMT

hi manuales,

If you are not at ease with the command line options, i would prefer to use SAM instead.

kind regards
yogeeraj

Re: Creating a volume group ....

Geoff Wild — Tue, 30 Jan 2007 08:32:04 GMT

lvmtab is a binary file - therefore use strings to look at it - never edit it with vi:

strings /etc/lvmtab |grep cXtXdX

or

strings /etc/lvmtab > /tmp/lvmtab.out

Then view or more /tmp/lvmtab.out and look for cXtXdX disk

Another way (if all vg's are activated):

vgdisplay -v |grep cXtXdX

Rgds...Geoff