Eyal Lebedinsky wrote:
>
> I have two disks as raid on a BP6 (HPT366) and had one too many
> lockups on hde+hdg, so I decided to move it down to hdb+hdd.
>
> I could not start the raid, it just complained that the disks
> are not at the major/minor it expected it.
>
> The first message said that [21:00] is now hdb, then it said
> that it cannot access [22:00] (naturally) so it removed a disk
> from the array, then it said the array expects two disks but
> only one was found.
>
> How do I tell it that the raid pair is just fine but it had to
> be moved to a new location?
>
> I tried 'mkraid --upgrade' hoping it will reconfigure but no dice
> (same errors as above).
OK, this time I really want to know how this should be handled.
I got a number of replies suggesting I use raidhotadd (which has
no man page or any doco that I can find). I tried and it will not
do a thing if raid is not started, but it wont start as I described
in my original post, so a catch 22.
I think that it will be nice to have a proper recipe for this
situation, preferably in the standard HOWTO. Whenever someone
wants to move one (or more) disk in an array from one location
to another, what should one do? This situation often arise when
the array is moved between machines. In my case it was a simple
case of upgrade. I wanted a larger array, so I created md1, copied
my md0 to it, then wanted to remove md0 and use the new one. I
could not leave md1 where is twa (hdf+hdh) since this controller on
the ABIT bp6 is unstable, so I had to move the array to hdb+hdd.
When I realised that this is the end of the road, I did what every
cornered animal would do. I examined the raid superblock (od), found
where the major/minor is located, zapped it to what I wanted it to
be and started the raid. Seems to work just fine. Naturally, one
(probably most of the people on this list anyway) can program one's
way out of almost any situation, but most raid USERS will probably
not want (or will not be able) to do so.
--
Eyal Lebedinsky ([EMAIL PROTECTED]) <http://samba.anu.edu.au/eyal/>
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