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Date:	Wed, 15 May 2002 13:11:28 PST7
From:	Peter Skye <pskye@peterskye.com >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: more on backup using compression software

Content Type: text/plain

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Steven Levine wrote:
>
> Will [RAR] handle [archive files that are] >2GB?

Mr. Steven never asks questions unless he knows the answers.

But I've been reading the RAR documentation and pretty soon I'll be as
smart as he is.

The HPFS file system won't allow file sizes larger than 2 GB, so RAR can
write terabytes and petabytes to HPFS all day and not get anywhere.
(The JFS file system allows >2GB.)

There's a -v switch in RAR which apparently creates "spanned" volumes on
a hard drive, something that PKZip OS/2 won't do. So you can apparently
stick a 6 GB archive into three 2 GB files using RAR. I haven't tested
this yet -- I'm still trying to figure out what RAR parameters to use to
back up an entire hard drive. Maybe something like

rar32 a -dh -ep2 -isnd [-m0 to -m5] -r [-s] [-sv-] -v2000m
mybackupfiles * \

where [] options aren't necessary. The options are
"a" adds files (this is the rar command rather than an option),
"-dh" backs up shared files,
"-ep2" stores the full path for each file,
"-isnd" turns sound on (Beep Power!),
the "-m*" option specifies the compression method,
"-r" recursively processes all subdirectories,
the "-s" option allows for better compression with lots of small files
(no recreation of dictionary),
the "-sv-" option keeps the dictionary when spanning volumes,
"-v2000m" creates spanned volumes with a max size of 2,000,000,000
bytes (slightly smaller than HPFS's 2GB limit).

- Peter

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