Has the limit of 32 disks per volume group gone away?

Has the limit of 32 disks per volume group gone away?

Post by John Schneide » Wed, 12 Jan 2000 04:00:00



Greetings,
    Recently, an AIX Performance Guy (I think his business card says it
just that way) at IBM told me he thought the 32 volume per volume group
limit had been changed, and he thought it was at 4.3.2.  Since I haven't
seen this in writing, I was wondering if anyone new the real story.
    It seems to me that this would require a pretty big change to the
VGDA on each disk, and that would mean different VGDAs for different
versions.  For example, all the systems on an SSA loop would have to be
at the same level, because of the VGDAs those systems would see.
    Is there any place I could read up on this?  Could you also email me
your response as well as post to the group?  My news server only holds
posts a couple days.

John Schneider

***********************************************************************

* Lowery Systems, Inc.
* 1329 Horan                  Disclaimer: Opinions expressed here are
* Fenton, MO 63026                   mine and mine alone.
***********************************************************************

 
 
 

Has the limit of 32 disks per volume group gone away?

Post by Amanda Mill » Wed, 12 Jan 2000 04:00:00


Yes its true, here is an extract from the IBM redbook, AIX 4.3 differences
guide

5.6 Big Volume Groups (4.3.2)
A new volume group (VG) format is added in AIX Version 4.3.2 that increases
the maximum number of disks that can be included in a volume group from 32
to 128. The maximum number of logical volumes in this new volume group
format is increased from 256 to 512. This means:
  The maximum physical volume (PV) number in one volume group is
increased from 32 to 128 (1024 in the future)
  The maximum logical volume (LV) number in one volume group is
increased from 256 to 512 (1024 in the future)

The guide can be downloaded in pdf format for www.redbooks.ibm.com


> Greetings,
>     Recently, an AIX Performance Guy (I think his business card says it
> just that way) at IBM told me he thought the 32 volume per volume group
> limit had been changed, and he thought it was at 4.3.2.  Since I haven't
> seen this in writing, I was wondering if anyone new the real story.
>     It seems to me that this would require a pretty big change to the
> VGDA on each disk, and that would mean different VGDAs for different
> versions.  For example, all the systems on an SSA loop would have to be
> at the same level, because of the VGDAs those systems would see.
>     Is there any place I could read up on this?  Could you also email me
> your response as well as post to the group?  My news server only holds
> posts a couple days.

> John Schneider

> ***********************************************************************

> * Lowery Systems, Inc.
> * 1329 Horan                  Disclaimer: Opinions expressed here are
> * Fenton, MO 63026                   mine and mine alone.
> ***********************************************************************


 
 
 

Has the limit of 32 disks per volume group gone away?

Post by Matthew Land » Wed, 12 Jan 2000 04:00:00



> Greetings,
>     Recently, an AIX Performance Guy (I think his business card says it
> just that way) at IBM told me he thought the 32 volume per volume group
> limit had been changed, and he thought it was at 4.3.2.  Since I haven't
> seen this in writing, I was wondering if anyone new the real story.
>     It seems to me that this would require a pretty big change to the
> VGDA on each disk, and that would mean different VGDAs for different
> versions.  For example, all the systems on an SSA loop would have to be
> at the same level, because of the VGDAs those systems would see.
>     Is there any place I could read up on this?  Could you also email me
> your response as well as post to the group?  My news server only holds
> posts a couple days.

> John Schneider

In AIX 4.3.2+ the option for a BIG VG can be made to allow upto
128 PVs/VG.  If you have a system at 4.3.2 or higher, man chvg or
man mkvg, look at the "-B" flag.  Be warned, a VG that has been made
BIG enabled CANNOT be used on lower levels of AIX that don't support
that feature.

 - Matt

--

  AIX and HACMP Certified Specialist   | |  / \ |\| |  \. ,_|  ` o O '
  / Comments, views, and opinions \    | |_/ ^ \|   | ) | |       x    
  \ are mine alone, not IBM's.    /    |___|/~\_\_|\|__/|_|     \___/

 
 
 

Has the limit of 32 disks per volume group gone away?

Post by Peter Behren » Wed, 19 Jan 2000 04:00:00


Be warned that using BIG enabled volume groups makes all LVM operations
iincredibly SLOW!
cently, an AIX Performance Guy (I think his business card says it

> just that way) at IBM told me he thought the 32 volume per volume group
> limit had been changed, and he thought it was at 4.3.2.  Since I haven't
> seen this in writing, I was wondering if anyone new the real story.
>     It seems to me that this would require a pretty big change to the
> VGDA on each disk, and that would mean different VGDAs for different
> versions.  For example, all the systems on an SSA loop would have to be
> at the same level, because of the VGDAs those systems would see.
>     Is there any place I could read up on this?  Could you also email me
> your response as well as post to the group?  My news server only holds
> posts a couple days.

> John Schneider

> ***********************************************************************

> * Lowery Systems, Inc.
> * 1329 Horan                  Disclaimer: Opinions expressed here are
> * Fenton, MO 63026                   mine and mine alone.
> ***********************************************************************

 
 
 

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