LinuxSA Mailing list archives

  From: Graham Smith <linuxsalist@sonicresolutions.com>
  To  : <davidn@rebel.net.au>
  Date: Thu, 16 Jan 2003 12:31:43 +1030

Re: /boot/grub/stage2 file changes magically.. very weird! (LONG post!)

> The raw partitions are not directories, they are simply streams of bytes.
> Thus, "cmp /dev/hda1 /dev/hdc1".  Note that you'll need to replace
/dev/hda1
> and /dev/hdc1 with whatever is appropriate for your installation.

Thanks for clearing that up for me David.. I always wondered exactly what
form the devices in the dev directory took.  Now I understand!

Ok.. the results of a cmp of my two mirrored /boot partition (which are
actually hda1 and hdc1 funnily enough) where VERY interesting:

17099288  57  50
17099289 147 150
17099290 162 144
17099291 165  60
17099292 142  54
17099293  57  60
17099294 147  51
17099295 162  57
17099296 165 147
17099297 142 162
17099298  56 165
17099299 143 142
17099300 157  57
17099301 156 147
17099302 146 162
17099303   0 165

This is starting to look VERY familiar!!  If I do a cmp of the two stage2
files I managed to capture "in the act" I get:

   536  57  50
   537 147 150
   538 162 144
   539 165  60
   540 142  54
   541  57  60
   542 147  51
   543 162  57
   544 165 147
   545 142 162
   546  56 165
   547 143 142
   548 157  57
   549 156 147
   550 146 162
   551   0 165

Behold, the differences between the two files I captured in their different
states and the two mirrored drives are identical.  I think we have found the
source of the problem.. an out of sync array.  So now theoretically, if I
force the raid array to do a resync, I might find my problem is solved
(here's hoping!).

Thanks again for all your help David.. this has been a real help!!

Cheers,
Graham

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