Accesing data on (old) XFS devices

Accesing data on (old) XFS devices

[Martin Mielke]

Hi all,

I have 2 SCSI disks which were used on an (old) Silicon Graphics running on IRIX 6.5.x
I need to recover the data from those disks, dump them somewhere else and forget about the SGI disks...

OpenSUSE 11 sees the devices correctly and with fdisk I can see the partitions:

--
# fdisk -l /dev/sda

Disk /dev/sda (SGI disk label): 255 heads, 63 sectors, 4865 cylinders
Units = cylinders of 16065 * 512 bytes

----- partitions -----
Pt#    Device  Info     Start       End   Sectors  Id  System
1: /dev/sda1  boot        66      2213  34510368   a  SGI xfs
2: /dev/sda2  swap         1        65   1048576   3  SGI raw
9: /dev/sda3               0         0      4096   0  SGI volhdr
11: /dev/sda4               0      2213  35563040   6  SGI volume
----- Bootinfo -----
Bootfile: /unix
----- Directory Entries -----
0: sash       sector    2 size  273408
1: ide        sector  536 size  249856
2: symmon     sector 1024 size 1113600


# fdisk -l /dev/sdd

Disk /dev/sdd (SGI disk label): 255 heads, 63 sectors, 9729 cylinders
Units = cylinders of 16065 * 512 bytes

----- partitions -----
Pt#    Device  Info     Start       End   Sectors  Id  System
3: /dev/sdd1               1        16    262144   3  SGI raw
4: /dev/sdd2              17        32    262144   3  SGI raw
5: /dev/sdd3              33       293   4194304   3  SGI raw
6: /dev/sdd4             294       555   4194304   3  SGI raw
7: /dev/sdd5             556       816   4194304   3  SGI raw
8: /dev/sdd6             817      1077   4194304   3  SGI raw
9: /dev/sdd7               0         0      4096   0  SGI volhdr
11: /dev/sdd8               0      2213  35563040   6  SGI volume
----- Bootinfo -----
Bootfile: /unix
----- Directory Entries -----

--

I added the following to /etc/raw:
--
raw1:sdd1
raw2:sdd2
raw3:sdd3
raw4:sdd4
raw5:sdd5
raw6:sdd6
--

...but then I get this error:
--
# /etc/init.d/raw  start
bind /dev/raw/raw1 to /dev/sdd1...                                    failed
bind /dev/raw/raw2 to /dev/sdd2...                                    failed
bind /dev/raw/raw3 to /dev/sdd3...                                    failed
bind /dev/raw/raw4 to /dev/sdd4...                                    failed
bind /dev/raw/raw5 to /dev/sdd5...                                    failed
bind /dev/raw/raw6 to /dev/sdd6...                                    failed
--

Later on I found this thread:

http://oss.sgi.com/archives/xfs/2005-11/msg00376.html

and this FAQ:

http://linux.math.tifr.res.in/programming-doc/xfs/faq.html#xfsmountfail

when I run xfs_repair -n /dev/sda or /dev/sdd  (-n = no modify mode) it yields the following message:
--
Sorry, could not find valid secondary superblock
Exiting now.
--

So...
my questions are: how destructive can a xfs_repair be in terms of
destroying all the data (disk image is already made) be? and is there
any way to access those devices??

I first asked this questions on the SuSE lists and I've been redirected here ;-)


TIA,
Martin


      

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Re: Accesing data on (old) XFS devices

[Eric Sandeen]

Martin Mielke wrote:
> Hi all,
> 
> I have 2 SCSI disks which were used on an (old) Silicon Graphics running on IRIX 6.5.x
> I need to recover the data from those disks, dump them somewhere else and forget about the SGI disks...
> 
> OpenSUSE 11 sees the devices correctly and with fdisk I can see the partitions:
> 
> --
> # fdisk -l /dev/sda
> 
> Disk /dev/sda (SGI disk label): 255 heads, 63 sectors, 4865 cylinders
> Units = cylinders of 16065 * 512 bytes
> 
> ----- partitions -----
> Pt#    Device  Info     Start       End   Sectors  Id  System
> 1: /dev/sda1  boot        66      2213  34510368   a  SGI xfs
> 2: /dev/sda2  swap         1        65   1048576   3  SGI raw
> 9: /dev/sda3               0         0      4096   0  SGI volhdr
> 11: /dev/sda4               0      2213  35563040   6  SGI volume
> ----- Bootinfo -----
> Bootfile: /unix
> ----- Directory Entries -----
> 0: sash       sector    2 size  273408
> 1: ide        sector  536 size  249856
> 2: symmon     sector 1024 size 1113600
> 
> 
> # fdisk -l /dev/sdd
> 
> Disk /dev/sdd (SGI disk label): 255 heads, 63 sectors, 9729 cylinders
> Units = cylinders of 16065 * 512 bytes
> 
> ----- partitions -----
> Pt#    Device  Info     Start       End   Sectors  Id  System
> 3: /dev/sdd1               1        16    262144   3  SGI raw
> 4: /dev/sdd2              17        32    262144   3  SGI raw
> 5: /dev/sdd3              33       293   4194304   3  SGI raw
> 6: /dev/sdd4             294       555   4194304   3  SGI raw
> 7: /dev/sdd5             556       816   4194304   3  SGI raw
> 8: /dev/sdd6             817      1077   4194304   3  SGI raw
> 9: /dev/sdd7               0         0      4096   0  SGI volhdr
> 11: /dev/sdd8               0      2213  35563040   6  SGI volume
> ----- Bootinfo -----
> Bootfile: /unix
> ----- Directory Entries -----
> 
> --
> 
> I added the following to /etc/raw:
> --
> raw1:sdd1
> raw2:sdd2
> raw3:sdd3
> raw4:sdd4
> raw5:sdd5
> raw6:sdd6
> --

You shouldn't need to play games w/ raw devices, I think.

I'd try:

# file -s /dev/sdd?
# file -s /dev/sda?

and see which partitions claim to hold xfs filesystems (I can't recall
offhand how the sgi partitioning works...)

Those *should* just mount right up.  If they have dirty irix-format
logs, you'll need to either mount (to replay the log) & unmount cleanly
under irix, or zap it with xfs_repair -L

-Eric

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