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Re: to-do-list version 2.
On Fri, 12 Jan 2001, Daniel Karrenberg wrote:
> At 05:31 PM 1/11/01, Rene Wilhelm wrote:
>
> >4.xx mechanism for semi automated recovery of ROOT files from tape
> >
> > to date we have all ROOT files on disk, but as time passes by
> > and more and more boxes come online, we may have to purge oldest
> > ones; a request to PoD for old data could then (temporarily)
> > retrieve the file for processing.
>
> What are the volumes we are talking about here?
> Do disk prices fall faster than growth ;-)?
I think that it is something to monitor. If we discover that there are a
lot of (PoD) requests for data not on disk, then there might be mileage in
this.
BTW. This question also came up at ISMA, when discussing storing IP
traces and such. There are tape-robots on the market that act as a
file-system, automatically retrieving files from tape if necessary, but
they are expensive (10^6) and aimed at applications with orders of
magnitude more data then we'll ever have.
After the meeting, Joerg mentioned that he was in contact with somebody
setting up a poor-man's version of this, using a tape-robot like the one
we have plus a few Gb's of disk for caching.
Henk
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