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  3. January 2007

Re: Erasing DASD-decommission an AS400/iSeries/System i



Interesting idea Larry.

Some thoughts/questions:

This probably has been asked before, but assuming someone ignores the
ASP threshold messages, at what percentage does i5/OS shutdown ?
or will it go to all the way to 100% and seize up ?
Somewhere 'near' 100% an IPL occurs, and without further warning. You get an SRC but I don't recall what that is. I suspect it matters little if you are in dedicated mode or not. The IPL clears some temp space allowing the system to come back up (usually!) 
Restricted state sounds like a good idea, but does it get you closer to
100% ?   While more work, wouldn't moving as many DASD units as possible
(non-OS)to another (and empty) ASP be the only way to completely wipe
these units ?
If you move them to other ASPs you'd still need to run this program on DB files in that ASP several times alternating 00s and FFs. Simply moving them will only write on them one time and I belive only writes 00s. Also be cautioned that ANYTHING you do that might cause OS/400 bits and pieces to be moved at all means those bits and pieces were likely moved to spots previously occupied by yuor stuff. If you put OS stuff where your stuff was then this program can't write on those spots. That's why I say delete all your stuff but leave the OS alone. This doesn't guarantee that some bit of your stuff only got written on once but if 99% of your stuff got written over and over and over with 00s and FFs then 99% of your stuff is good and gone. The remainint 1% is STILL subject to being un-erased and since NOBODY knows where that stuff might be they'd have to un-erase all your disks. Is that something someone would pay huge momey for to un-erase a big pile of disks to *MAYBE find les than 1% of your stuff? With my luck I'd find the deleted records from a transaction file from 1995!!! 

 - Larry


Keith

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