Re: changing pp size of a volume group

From: Bill (bverzal_at_komatsuna.com)
Date: 03/31/04 

Date: 30 Mar 2004 19:45:50 -0800

Tom Van Overbek <tom.van.overbeke@pandora.removeme.be> wrote in message news:<pan.2004.03.30.20.57.30.358630@pandora.removeme.be>...
> >>
> >> I was wondering if anyone sees a way out to do the migration online ? is
> >> there a procedure to change the PP size of a volume group 'on the fly' ?
> >> if this were possible, we could migrate the data to the new disks (that will
> >> also have 8 MB pp size), and remove the old disks, and then somehow increase
> >> the pp size online ?
> >>
> >> i've never heard of this, so i don't think this is possible, but i thought
> >> i'd ask anyway.
> >>
> >> second question:
> >>
> >> if the volumegroup was converted to a 'big' volumegroup, can the PP size be
> >> increased or not ?
> >> conversion of a non root-vg to a 'big' volumegroup can also not be done
> >> online i thought, but maybe i am wrong ?
> >>
> >>
> >> any pointers are welcome.
> >>
> >>
> >> thanks,
> >>
> >>
> >> Tom.
> >
> > Under no circumstances can you change the PP Size (except of course a
> > backup and restore). You could to a 'chvg -t #' to change the
> > 'factor'. This would allow more than 1016 PPs per physical disk.
>
> That's what i thought. bummer.
>
> while on the subject, i've got another question:
>
> suppose you have a disk which was part of a volumegroup where pp size was
> 32MB. then you do an exportvg of the disk, and try to import this disk into a
> volumegroup with a pp size of 16MB.
>
> I suppose the action will fail ?
>
> Tom.

Definitions:

"Import a disk into a volume group" means "read the VGDA and create a
VG with the filesystems on the disk based on the info in the VGDA.
This is donw via 'importvg'"

"Extend a volume group" means "blow away the VGDA on the disk in
question and lose all information on it, and add it to volume group x.
 This is done via 'extendvg'"

BV

Relevant Pages

  • Re: changing pp size of a volume group
    ... >> I was wondering if anyone sees a way out to do the migration online? ... >> if the volumegroup was converted to a 'big' volumegroup, ... >> Tom. ... suppose you have a disk which was part of a volumegroup where pp size was ...
    (comp.unix.aix)
  • Re: Munged partition table
    ... The OS disk I think would be /dev/sda and is also in a volume group / ... partitions should be/would be. ... Is that all handled by the VolumeGroup? ... <gpart package description> ...
    (comp.os.linux.setup)
  • Munged partition table
    ... The OS disk I think would be /dev/sda and is also in a volume group / ... An fdisk now looks like this: ... partitions should be/would be. ... Is that all handled by the VolumeGroup? ...
    (comp.os.linux.setup)
  • Re: changing pp size of a volume group
    ... > suppose you have a disk which was part of a volumegroup where pp size was ... > volumegroup with a pp size of 16MB. ... When you add a disk to a VG using extendvg, ... You cannot join two VGs with either extendvg or importvg. ...
    (comp.unix.aix)
  • Re: extending data partitions & my documents redirection
    ... I understand that you have a hardware RAID 5 disk and you ... want to extend E drive from those unallocated space. ... Microsoft CSS Online Newsgroup Support ... >> Document Redirection on your SBS 2K3 server. ...
    (microsoft.public.windows.server.sbs)