Dirk.Schmiedt@munich.netsurf.de (Dirk Schmiedt) writes
[...]
If you just want to zero one selected single disk start: vol add vol0 -n -d YOUR.DISK
He will check wether the disk is zeroed, and if not do so ... After zeroing, he will detect the '-n' option and therefore not add it to the volume. It will stay a spare disk. :-) This is very useful for older ONTAP releases who don't have the "disk zero spares" command.
Neat trick! I'll add that one to the collection...
If your focus is on data destruction:
If you really want to wipe the old data for data security reasons you should buy a "sanitation" license from NetApp to have a legally approved wipe out process. disk sanitize start ...
"Legally approved" ?
The description in the man page doesn't sound all _that_ strong:
| If no patterns are specified, the default is 3 using pattern 0x55 | on the first pass, 0xaa on the second, and 0x3c on the third.
which is roughly what a Unix "format analyze" will do (though better than a simple zeroing, agreed). No deliberate write-with-track-offset, for example.
If you want to do it the "cheap" way: Fill and destroy the volume at least 5 (up to 10) times. Those data reconstruction services can tell by seeing if your "1" is hanging at 90,91 or 97.5% wether the history of this bit is 11011 or 01101 or 11001 or ... => To fill it use random data (by using the network clients as your random data source with a lot of network trafic :-( ). Using "hammer" inside the filer is definitely not safe enough. => Buy the sanitation license if you don't want to get killed by your colleges.
Colleagues? (I presume). It's the litigious users I would be worried about, not my colleagues...
[Or perhaps you really did mean "colleges". Working as I do for a collegiate University, I am certainly aware of the animosities that arise between the Colleges and the University. But I don't think they have actually got around to organising a hit squad yet ...]
Chris Thompson University of Cambridge Computing Service, Email: cet1@ucs.cam.ac.uk New Museums Site, Cambridge CB2 3QH, Phone: +44 1223 334715 United Kingdom.