Internal Disk upgrade

[Josee Bourget-Thuma]

Hi,

I currently have 4x4GB disks on a K class.
I recently ordered a 36GB disk to expand volumes. I will replace on of the 4GB with the bigger and better disk. Anywords of advice on how to proceed and be sure to have full recovery?

Any ideas on how to made best use of disk resources once the new disk is on?

Thanks in advance for everyone's help.

Josee...

[Ajay Sishodia]

For the volume group that you will be extending do a vgdisplay -v /dev/vg??
check for the value in Max PE per PV ????

If this is <=1100. Than when you try to extend vg?? by including the 36Gb disk you will still have only 4gb added to the volume group.

Max PE per PV should be alteast 4350 for you to be able to use the 36Gb disk.

If you create a new volume group using this disk than there's no problem!

later
Ajay

[James R. Ferguson]

Hi Josee:

You don't indicate whether or not you are replacing your root disk (vg00). If you are, then the most straighforward, safest way is to create an Ignite make_recovery_tape of your current system, install your new 36GB disk and recovery to it.

The problem with adding (vgextend(ing)) existing volume groups with new large physical disks is that the LVM geometrity is established during the 'vgcreate'. The values of 'max_pe', 'max_pv' and 'max_lv', cannot be changed once set. In the case of 'max_pe' the value is taken to be 1016 or the largest number of extents allocatable on the largest physical disk seen during the vgcreate process. Thus, if you started with 4GB disk, and created a volume group using only default values, you would find that a 9GB disk was about the largest physical disk that you could later add (vgextend) to the volume group and still utilize 100% of its physical extents.

Thus, if you are replacing 4GB disk with 36GB ones, I would consider creating a new volume group with appropriate values and copying data from the old one to the new. As indicated at the beginning, if this is vg00, then an Ignite make_tape_recovery / reinstall is the most desirable.

...JRF...

[Magdi KAMAL]

Hi Josee,

Here is the following, I did this task last January:

1. make_recovery for the actual vg00 ( internal disks ). I would prefer two times make_recovery.

2. Replace the disks. ( Keep the old disks till the installation is finish, prehaps you will need them !).

3. Put you Ignite-Tape into drive.
4. Power on.
5. Interrupt the boot process in the ISL level.
6. execute SEA ( Search for hardware paths ).
7. Type BO P5
P5 : Stand for the h/w path for the tape drice for example.
8. continue with the step by step installation.
9. The System will finish installation with the message "OK." in banner format and boots a last time.
Then the system will be ready.

Magdi

[Magdi KAMAL]

Hi again,

I believe you need to increase to amount of space of :
/opt
/usr
/var
/home

and so on ... so you need to configure these mount point will doing the restaure from tape.

Any help ?

Magdi

[Josee Bourget-Thuma]

Thanks everyone for answering.
I ended up being able to play around and test before hand.

Works like a champ.
Sorry for the delayed points.
I'm not receiving email notification on my forums for some reason.

Thanks again!
Josee...