> Besides Tomas' suggestion (which sounds likely), you need a chunk-size line,
> even with linear-raid.
Ah! I added "chunk-size 4" to the raidtab, and now I can run mkraid. I think
the HOWTO should be updated, the example for linear there doesn't have
chunk-size...
So now I have been able to test the new RAID code, but it still fails in the
same way as the old code from 2.2.13. Take a look at this:
</scratch/raidtools-0.90> # cat /proc/mdstat
Personalities : [linear]
read_ahead 1024 sectors
md0 : active linear [dev 07:01][1] [dev 07:00][0] 665600 blocks 4k rounding
unused devices: <none>
</scratch/raidtools-0.90> # hd /dev/md0 | head -10
00000000: f8ffffff 00000000 00000000 00000000 00000000 ....................
00000014: 00000000 00000000 00000000 00000000 00000000 ....................
*
000001f4: 00000000 00000000 00000000 f8ffffff 00000000 ....................
00000208: 00000000 00000000 00000000 00000000 00000000 ....................
*
00038bf8: 00000000 00000000 41424344 45464748 41424344 ........ABCDEFGHABCD
00038c0c: 45464748 41424344 45464748 41424344 45464748 EFGHABCDEFGHABCDEFGH
00038c20: 00000000 00000000 00000000 00000000 00000000 ....................
*
</scratch/raidtools-0.90> # mkdosfs /dev/md0
mkdosfs 0.4, 27th February 1997 for MS-DOS/FAT/FAT32 FS
</scratch/raidtools-0.90> # hd /dev/md0 | head -10
00000000: eb3c906d 6b646f73 66730000 02200100 02000200 .<.mkdosfs... ......
00000014: 00f8a300 04000200 00000000 00501400 00002970 .............P....)p
00000028: 254d3820 20202020 20202020 20204641 54313620 %M8 FAT16
0000003c: 20200e1f be5b7cac 22c0740b 56b40ebb 0700cd10 ...[|.".t.V.......
00000050: 5eebf032 e4cd16cd 19ebfe54 68697320 6973206e ^..2.......This is n
00000064: 6f742061 20626f6f 7461626c 65206469 736b2e20 ot a bootable disk.
00000078: 20506c65 61736520 696e7365 72742061 20626f6f Please insert a boo
0000008c: 7461626c 6520666c 6f707079 20616e64 0d0a7072 table floppy and..pr
000000a0: 65737320 616e7920 6b657920 746f2074 72792061 ess any key to try a
000000b4: 6761696e 202e2e2e 200d0a00 00000000 00000000 gain ... ...........
</scratch/raidtools-0.90> # mount -t msdos /dev/md0 /mnt
mount: wrong fs type, bad option, bad superblock on /dev/md0,
or too many mounted file systems
</scratch/raidtools-0.90> # hd /dev/md0 | head -10
00000000: f8ffffff 00000000 00000000 00000000 00000000 ....................
00000014: 00000000 00000000 00000000 00000000 00000000 ....................
*
000001f4: 00000000 00000000 00000000 f8ffffff 00000000 ....................
00000208: 00000000 00000000 00000000 00000000 00000000 ....................
*
00038bf8: 00000000 00000000 41424344 45464748 41424344 ........ABCDEFGHABCD
00038c0c: 45464748 41424344 45464748 41424344 45464748 EFGHABCDEFGHABCDEFGH
00038c20: 00000000 00000000 00000000 00000000 00000000 ....................
*
</scratch/raidtools-0.90> #
So, a filesystem is created, and then magically disappears again!
- Patrik Rådman
