Re: grub rescue read or write sector outside of partition

[Andrei Borzenkov]

В Thu, 25 Jun 2015 17:33:25 -0700
"Dale Carstensen" <address@hidden> пишет:

> I had a drive fail, and it is the one that had grub on it.
> It had parts of two RAID-6 partitions, too.  So I bought a
> new drive and added partitions on it to replace the failed
> RAID-6 parts.  That was still booting OK from the failed
> drive, but then I updated the kernel, and I decided to also
> install a new grub on the new drive.
> 

How? Please show exact commands you used as well as your disk
configuration.

> That seemed to go OK until I tried to reboot.  I landed in
> grub rescue.  Fortunately I have several computers, so I can
> look up documentation, etc. without my main desktop functioning.
> Somewhere I found that grub rescue has only a few commands, none
> of them "help" or a list of commands, and no TAB-expansions.
> Well, they seem to be ls, set, unset and insmod.  Supposedly,
> running insmod normal, then normal, will get back to the
> fuller set of commands with help, but that's where it gets
> the "outside of partition" error, it seems.
> 
> I can ls the /boot/grub/i386-pc/ directory, where normal.mod
> is, so I would think grub rescue could find and read normal.mod,
> too, but, I guess not.
> 

Please show output of "set" command at this point.

> So, set debug=all helped a little, expanding the message
> from just something like (I'd have to keep trying to
> reboot to get it verbatim) read or write bad, to
> the specific size of the partition (in decimal, around
> 175 million 512-byte blocks) and the sector it is trying
> to read (read.c:461) (in hexadecimal), around 10 million.
> But 10 million hex really is larger than 175 million
> decimal.
> 
> So maybe my BIOS has some limitation on how deep it can
> read into this 2 TB drive, or maybe the drive having
> hardware sectors of 4096 bytes replacing one with
> 512 confuses grub.  But the old drive with the failures
> gets the same problem.
> 
> It's gentoo, grub2 (I could look up the version once it's
> running again), 64-bit (although grub seems not to really
> notice 32- vs 64-bit, or the kernel, so I'm not sure it's
> just smart or really dumb), and, like I say, the / partition
> is RAID-6, including /boot.  I'm going to try making a
> non-RAID /boot, maybe later I'll try making it RAID-1,
> to see if that helps.
> 
> Any advise?
> 
> Thanks.
> 
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