rewinding a disk drive takes too long

Garance A Drosihn drosih at
Sun Jan 18 18:49:01 PST 2004

At 11:13 PM +0100 1/17/04, Poul-Henning Kamp wrote:
>In message <E1Ahyej-0000OI-5l at>, Randy Bush writes:
>  >
>>btw, what i forgot to say was
>>   o source system is current as of yesterday
>>   o dest system is stable as of today
>  >  o until the last upgrade to the stable dest, dump would
>  >    never complete!  it always got to the same point, 86%,
>  >     and then hung
>This is actually a pretty normal thing, dump is not very good at
>predicting the size of a dump if the filesystem is live (and I
>belive in a few other circumstances as well)
>Largest number I've seen recently was -250% :-)

Why would dump have trouble predicting the size of a "L"
filesystem?  If "L" is specified (and it apparently was in
this example), then wouldn't dump be working off of a static
snapshot of the filesystem?

Garance Alistair Drosehn            =   gad at
Senior Systems Programmer           or  gad at
Rensselaer Polytechnic Institute    or  drosih at

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