Adding disks to 12h array

[Brad Marks]

I need to add 2 disks to my 12h which has four 18gb drives in it now. Once installed and included, how do I incorporate them into an existing LUN?
After that is done, I simply have to pvcreate, vgextend, and lvextend to have them be part of an existing logica volume, right?
Is there a step-by-step guide anywhere for this?
TIA,
Brad

[A. Clay Stephenson]

You don't. Once created a LUN's size is fixed. You can create another LUN and then add that LUN to an existing VG (after doing) a pvcreate.

You do a pvcreate, a vgextend, an lvextend, and finally an extendfs (or fsadm) to grow the filesystem.

Note that there is almost certainly no point in creating a LUN bigger than your biggest LUN within the existing VG otherwise almost certainly some PE's within the new LUN will not be accessible by LVM.

By the way, you can do all of this inside SAM and it works well.

[Rammig Claus]

Hi Brad,

make an ioscan and insf to obtain the devicename of your new disks.
Then you had to

pvcreate /dev/rdsk/

vgextend vg<..> /dev/dsk/

lvextend -l

Best regards ...
Claus

[Brad Marks]

A.Clay,
What are the steps to create a new LUN and then add it to an existing VG?

Your responses have been very helpful.
Thanks much.

[Eugeny Brychkov · Accepted solution]

As you wrote, after including disks process called balancing should start. This process redistributes data across all disks, placing rarely accessed data to RAID 5 and often accessed data to RAID 0/1.
All LUNs are spread across all physical disks in the autoraid, so adding more disks will increase space available for LUN creation.
So you can create another LUN in this new space, or delete old LUN and create new bigger LUN. Then newly created or recreated LUN will be visible in ioscan, and you'll be able to do anything with it as it is an ordinary SCSI disk
Eugeny