Subject: Re: Suggestions for a backup solution
To: Wojciech Puchar <>
From: Steven M. Bellovin <>
List: netbsd-users
Date: 01/02/2002 17:41:34
In message <>, Wojci
ech Puchar writes:
>> (
>> claims that (in the U.S.) DVD-Rs cost about $10, and rewritable ones
>> about $5 more.  I haven't tried hard to verify either number, but a
>so it's very expensive in poland only (about 2x)
>15$/5GB disk will be cheap.
>> 30-second search of one Web site found one brand of rewritable DVD at
>> US$19.  Not cheap, compared to CD-R, but I can certainly afford a few
>> for level 0 dumps.  And as you point out, most level 1 and higher dumps
>> won't take up more than one CD-R.
>> As for
>> > you always can record through pipe.
>> > i recorded >500 CD's through pipe on 6x speed CD-R on P-133 with 5400RPM
>> > IDE drive, often while listening to mp3's, browsing www, reading
>> > mail/news, sometimes compiling and NEVER had buffer underrun.
>> Yes, I can write a script that uses pipes, and I probably will (I
>> hadn't realized that piping dump | mkisofs | cdrecord would work).  But
>no mkisofs!!!!!
>mkfifo /tmp/cdrecord
>dump ........parameters.... -B 666000 -f /tmp/cdrecord
>on another console
>cdrecord -v blank=fast speed=xxx /tmp/cdrecord
>and when dump prompts for next media rerun cdrecord and then hit enter in

Thanks -- I hadn't realized that that would work.  And with a bit of 
tweaking, it would be a nice use for portal_fs.

		--Steve Bellovin,
		Full text of "Firewalls" book now at