Re: Controller question

Matthias Oertli <oertlim@s054.aone.net.au> wrote:

>I would dearly like to know why it was not possible
>to just replace the controller. What data is kept on
>the disk controller? Can it be backed up?
>Any info (or pointers to some docs) would be appreciated.

Can't read the story till I get home from work, but this may be related to
the controller's ability to cache disk updates to improve performance.
Until the cache has been written back to the disk, the disk is invalid by
itself. I've run into a problem like this before while trying to swap disks
between machines. The system detects that you have done something stupid
and won't let you proceed.

Dave Kahn, ABB Steward Ltd.


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