Re: GPT missing after controller swap (wd to ld)

[Louis Guillaume <louis%zabrico.com@localhost>]

On 10/10/16 3:40 PM, John Nemeth wrote:
> On Oct 10,  2:22am, Louis Guillaume wrote:
> }
> } On NetBSD 7.0_STABLE, i386, (from earlier this year) I had configured a
> } couple of disks with GPTs and then switched controllers (wd1 now shows
> } up as ld1) and now the GPT appears to have gone missing. However my
> } wedges are still there...
> }
> } # gpt show ld1
> } gpt: error: map entry doesn't fit media
> } gpt: unable to open device 'rld1d': No such file or directory
> }
> } # dkctl ld1 listwedges
> } /dev/rld1d: 2 wedges:
> } dk0: boot0, 524288 blocks at 128, type: ffs
> } dk1: disk0, 3906504704 blocks at 524416, type: raidframe
> }
> } The first wedge is intended to just hold a kernel and emergency root
> } file system for booting. The root file system is on a raid array built
> } with dk1 (and others). I'm currently booted off a separate disk because
> } the bootmenu did not include the boot.cfg "installboot"-ed to ld1.
> }
> } Did something in the BIOS overwrite the GPT? How to recover?
>
>      It is pretty obvious that the GPT is still there, otherwise
> the kernel would not have found the partititions in order to create
> the wedges when it attached the disk.
>
>      What has happened is that for some reason it thinks the size
> of your disk has changed.  In another message, you show that the
> disks are now attached to a RAID controller (twa).  Somebody else
> suggested that the RAID controller is using some blocks at the end
> of the disk for its own purposes.  That is highly likely what
> happened.  To fix this issue, run "gpt resizedisk ld1".  You may
> need a newer version of gpt(8) to get the resizedisk function.
>
> }-- End of excerpt from Louis Guillaume


Looks like "resizedisk" has the same complaint as "show". The first 
messages are from the gpt from HEAD and second group is from netbsd-7.


# ./gpt -vvv resizedisk ld1
/dev/rld1d: mediasize=1999988850688; sectorsize=512; blocks=3906228224
/dev/rld1d: MBR not found at sector 0
/dev/rld1d: Pri GPT at sector 1
/dev/rld1d: GPT partition: type=ffs, start=128, size=524288
/dev/rld1d: GPT partition: type=raid, start=524416, size=3906504704
gpt: /dev/rld1d: map entry doesn't fit media
#
#
# gpt -vvv resizedisk ld1
gpt: rld1d: mediasize=1999988850688; sectorsize=512; blocks=3906228224
gpt: rld1d: MBR not found at sector 0
gpt: rld1d: Pri GPT at sector 1
gpt: rld1d: GPT partition: type=ffs, start=128, size=524288
gpt: rld1d: GPT partition: type=raid, start=524416, size=3906504704
gpt: error: map entry doesn't fit media
gpt: unable to open device 'rld1d': No such file or directory