New device drivers don't see beyond 15 partitions in fc7

[Lamont Peterson]

On Thursday 21 December 2006 10:31pm, Dave Jones wrote:
> On Thu, Dec 21, 2006 at 05:57:31PM -0500, Clyde E. Kunkel wrote:
>  > Hello,
>  >
>  > With the change from traditional /dev/hd* type device nodes to /dev/sd*
>  > type nodes, I see that the highest partition number that can be used is
>  > 15.  Will this change so that higher numbers will be available?  I do
>  > have a system that has a drive with almost 30 small partitions used in a
>  > research effort and the number of partitions has not been an issue thru
>  > fc6.
>
> afaik, The only way to achieve > 15 "partitions" per disk with /dev/sd* is
> to use device mapper.  I'm not sure the upper limit of logical volumes per
> PV, but I'm fairly sure it's higher than 15.

Under LVM1 (2.4 kernel and earlier) it was 256 LVs per *system* (only one 
major number is used for all of LVM).  The number of VGs (limited to 99, BTW) 
was not a factor, nor the number of PVs.

Because the 32-bit device number space is split at 20 bits major and 12 bits 
for the minor number (have I got that right way around), I would guess that 
LVM2 (kernel 2.6 & later) supports a maximum of 4096 LVs per system.
-- 
Lamont Peterson <lamont at gurulabs.com>
Senior Instructor
Guru Labs, L.C. [ http://www.GuruLabs.com/ ]

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