On Mar 26, 1:06pm, Steve Lord wrote:
> Subject: Re: Moving IRIX disk to Linux
> > ...
> > During the boot, the kernel reports:
> > Detected scsi disk sda at scsi0, channel 0, id 1, lun 0
> > SCSI device sda: 91923356 512-byte hdwr sectors (47065 MB)
> > Partition check:
> > /dev/scsi/host0/bus0/target1/lun0: unknown partition table
As Steve pointed out, your kernel doesn't support the SGI
disk partitioning scheme used in IRIX. The other thing
worth noting is...
> > But fdisk sees the partition table OK:
fdisk knows what the ondisk format for an SGI disk label
is, so doesn't require any kernel support in order to
print the partition table. However, ...
> > Disk /dev/sda (SGI disk label): 28 heads, 328 sectors, 10009 cylinders
> > Units = cylinders of 9184 * 512 bytes
> > ----- partitions -----
> > Device Info Start End Sectors Id System
> > /dev/sda8 1 10009 91919260 a SGI xfs
> > /dev/sda9 0 0 4096 0 SGI volhdr
> > /dev/sda11 0 10009 91923356 6 SGI volume
> > And the only device file associated with the disk is /dev/sda--no
> > sda8, sda9, or sda11.
Once you have built a kernel with SGI partition support,
you should refer to /proc/partitions to figure out the
device names to use when mounting the filesystem, and not
the fdisk output - the kernel uses a different partition
numbering scheme and the two do not match up (fdisk gets
it even more wrong when devfs is in use, but it is "wrong"
without devfs too).
I haven't had time to try to fix this as yet, but shouldn't
be too hard (just needs someone to understand the algorithm
used in linux/fs/partitions/sgi.c, then make fdisk use the
same algorithm, rather than using the partition IDs from
the label - that code is in the util-linux package -> eg.