Date: Thu, 09 Sep 1999 14:52:45 +0100 From: Karl Pielorz <kpielorz@tdx.co.uk> To: Ian Diddams <didds@freenet.uk.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Backups (yet again I hear you sigh) Message-ID: <37D7BBAD.EB2385A7@tdx.co.uk> References: <37D50936.45C520F8@freenet.uk.com>
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Ian Diddams wrote:
> So - my query is merely this - what the proverbial am I doing
> incorrectly ('cos I must be missing something very fundamental) and how
> do I force the compression on the backup ?
The DAT should ship with compression 'on' by default, unless you change the
DIP switches, ours did here... Have you tried using the '-a' option with
Dump?, ie.
"
-a ``auto-size''. Bypass all tape length considerations, and enforce
writing until an end-of-media indication is returned. This fits
best for most modern tape drives. Use of this option is particu-
larly recommended when appending to an existing tape, or using a
tape drive with hardware compression (where you can never be sure
about the compression ratio).
"
I have a SureStore 24e plugged into my -current box at the moment (I must have
missed your orignial postings), looking at the output of df - my nightly
backups are now around 18gb's admitadly done as 5 seperate 'chunks' of between
.2 and 9gb's (using the non-rewinding device), but they all go on the tape
fine...
(This also assumes as you say that Solaris ufsdump is akin to BSD dump).
Also, is the tape is rewound before you start? (i.e. mt rewind) - I've fallen
foul of that one before... :)
-Karl
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