[linux-lvm] pvcreate problem

[Yajith Ajantha Dayarathna | යජිත් අජන්ත දයාරත්න]

On Feb 13, 2008 3:28 PM, Bryn M. Reeves <breeves at redhat.com> wrote:

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> Yajith Ajantha Dayarathna | ????? ????? ??????? wrote:
> > even though the fdisk output contains "/dev/cciss/c0d0p16" there is no
> > such device created under /dev/cciss/.
> > Is it because of the above mentioned limitation ?
>
> That's correct - under Linux, IDE hard disks (/dev/hd*) can have up to
> 63 partitions but SCSI and RAID controllers like the CCISS are limited
> to 15 partitions (16 if you count the whole-device) due to the way minor
> numbers are allocated to /dev/sd* nodes.
>
> You could cheat and map the additional partitions using kpartx - run
> "kpartx -a /dev/cciss/c0d0" and this should create a device-mapper
> device for each partition under /dev/mapper/c0d0p*. You can remove them
> again with "kpartx -d /dev/cciss/c0d0".
>
> That said, it might be better to reconsider your partitioning scheme and
> see if you really need that number of partition table entries.
>
> Regards,
> Bryn.
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i will try the mapper device.
yes, the partitioning scheme is quite inflexible.

Does LVM use the same technique to get around this limitation ? I have seen
devices getting created under /dev/mapper.
Always thought its a part of LVM.

thanks a lot for all your support...
-- 
Yajith Ajantha
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