0516-050 Insufficient Descriptor Space
Steve Ryder
I am adding a new physical volume to a system. New disk is external, 2G.
Existing disks are internal, 2x1G. AIX 4.1.5 installed.
Upon trying to extend the rootvg to include the new disk, hdisk2, I get the
0516-050 error indicating insuffient descriptor space exists to execute the
extension. Can descriptor space be increase? How do I get sufficient space on
my existing disks to perform the necessary extendvg?
Steve Ryder
Senior Systems Consultant
Penlieu Consultants Inc.
st...@penlieu.com
905.602.9600 x225
pete_b...@my-dejanews.com
In article <356dc...@n3.idirect.com>,
st...@penlieu.com wrote:
>
> I am adding a new physical volume to a system. New disk is external, 2G.
> Existing disks are internal, 2x1G. AIX 4.1.5 installed.
>
> Upon trying to extend the rootvg to include the new disk, hdisk2, I get the
> 0516-050 error indicating insuffient descriptor space exists to execute the
> extension. Can descriptor space be increase? How do I get sufficient space
on
> my existing disks to perform the necessary extendvg?
status areas after the volume group has been created (one of the things
you can't (I think) change) The immediate solution _IF_ you really
want this external disk to be added to the root volume group (and I
really _wouldn't_ recommend it for an external disk) then you should
take a mksysb image and reinstall it on all three disks.
What I think you probably should do is create a new volume group for
the external disk than make filesystems on that external disk and
mount them as usual. (That's what I do with my AIX ThinkPad and a
Jaz external scsi disk) The thing with external disks is, even in
computer rooms, people sometimes trip over and pull out power cables
for externally connected devices and the root volume group would be
protected from that kind of accident if you create a new volume group
for this external device.
Hope that is clear, and helps...
Pete Bennett.
http://www.galactic.co.uk http://www.galactic.co.uk/pete
http://www.dsps.net
>
> Steve Ryder
> Senior Systems Consultant
> Penlieu Consultants Inc.
> st...@penlieu.com
> 905.602.9600 x225
>
>
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Andrew J. Sinclair-Hall
Steve Ryder wrote in message <356dc...@n3.idirect.com>...
>I am adding a new physical volume to a system. New disk is external, 2G.
>Existing disks are internal, 2x1G. AIX 4.1.5 installed.
>
>Upon trying to extend the rootvg to include the new disk, hdisk2, I get the
>0516-050 error indicating insuffient descriptor space exists to execute the
>extension. Can descriptor space be increase? How do I get sufficient space
on
>my existing disks to perform the necessary extendvg?
The VGDA or Volume Group Descriptor Area resides at the begining of every
drive in an AIX system. Depending on how many drives you have, relates to
how many copies of the VGDA are on the disk. If you have only 2 disks in
your system then the HDISK0 (if it's your primary rootvg disk) will contain
2 copies and HDISK1 will contain 1. The reason for this is the system must
have 51% of the VGDA's in a volume group to enable that vg. There are ways
to enable in maintainance mode, but anyway, the only reason I would think of
that you are getting this error is because one of the 2 disks already in
your system are full! This would not allow the sys to write information the
the VGDA. One other reason could be that all your logical volumes are set
to write to the Inner Edge or begining of the Disk, you could have tons of
free space, but none where the VGDA needs to write! I would try
Reorganizing your volume groups to say 'middle' ? All this does is moves
the data to a different location on the disk. Still BIUF Back It Up
First.!!!
TTYL
Andy
AIX Administrator
Kevin Gee
Steve Ryder wrote:
>
> I am adding a new physical volume to a system. New disk is external, 2G.
> Existing disks are internal, 2x1G. AIX 4.1.5 installed.
>
> Upon trying to extend the rootvg to include the new disk, hdisk2, I get the
> 0516-050 error indicating insuffient descriptor space exists to execute the
> extension. Can descriptor space be increase? How do I get sufficient space on
> my existing disks to perform the necessary extendvg?
Recreate the VG on all the disks with a mksysb. I'll bet that this
machine was installed at AIX 3.2 and upgraded to AIX 4.1.5. Otherwise,
the problem shouldn't present itself.
> Steve Ryder
> Senior Systems Consultant
> Penlieu Consultants Inc.
> st...@penlieu.com
> 905.602.9600 x225
--
Kevin Gee
ge...@cse.uta.edu Graduate Student, Univ. of Texas at Arlington
kr...@us.ibm.com AIX Software Analyst, IBM Product Support Services
IBM and UTA are not responsible for my opinions.