Max number of physical volumes alowed in a volume group

[BOB BARBA]

Is there a limit to the number of physical volumes you can add to a non system volume group? I have an external HASS fully populated with 8 drives. I have two internal discs that I would like to add to the same volume group - is this possible?

Many thanks .... BobB

[James R. Ferguson · Accepted solution]

Hi:

The default value for the maximum number of physical volumes in a volume group is 16. This value an be set with the '-p ' option of the vgcreate command. 'max_pv" can range from 1-255 but cannot be altered once the volume group is created.

...JRF...

[Emil Velez]

If you do a vgdisplay -v vgXX it will show
you a field called MAX PV. This is the maximum number of disks that can be in the volume group when it was created. A previous reply mentioned how this is specificed in the vgcreate command. I suggest that anytime someone uses vgcreate they set

vgcreate -e 20000 -p 100

so you can have 100 disks in the volume group and 20000 (4 MB extents) on a single disk.

That should keep you for a while i hope.

[Dan Hetzel]

Hi Bob,

As your HASS is populated with 8 drives, you should be able to add another 8 drives, providing the volume group has been created with de default max of 16.

Your MAX PV will be shown with 'vgdisplay -v vgXX' but cannot be changed once the volume group has been created.
Keep this in mind for next time.
The absolute maximum is 255.

Best regards,

Dan