Re: mkisofs aborts but exit value is 0
> > - Damaged CPIO archives are much harder to recover than
> > tar archives.
> afio does a good job with that.
But this is very time consuming as it needs to step forward
in 2 byte units while tar may do it in 512 byte units.
> > - The POSIX cpio format is limited to 8 GB files.
> > The SVr4 cpio format is even limited to 2 GB files.
> I urge my users not to store files larger than 2 GB
> in any backup format. Such a size makes readability
> questionable. Not only because of the reader software
> but also because of the rest of the reading system's
While this may have been true 1995 when the first large file
support appeared on UNIX, it is no longer true today if you
use the right backup tools.
> Well, in this scenario my own software is the backup
> utility and star is the media image formatter (like
> afio, mkisofs, zip or whatever).
If you do this with mkisofs or afio which are no backup
tools, this may be OK, but if you do this with a program like star
that includes backup support, it is questionable.
> Very good. It's rare that command line utilities
> specify their exit values.
> I meanwhile had found that exit(-2); in star.c
> and dared to make my wrapper handle 254 as
> a non-perfect but overall successful program run.
If you know that there may be tolerable problems, it is better
to use the errctl= option and to tell star to ignore this
> > star-1.4 does not support incrementals.
> > with cpio, or a similar program, this is not possible too.
> But with scdbackup it's possible :))
> Incremental ISO, incremental afio, incremental star-1.4 ...
> on a file-by-file level, not on a rsync level.
Does scdbackup support renamed and removed files?
Star does. It does even in a very efficient way.
> Nevertheless one has to warn users of the increase in
> complexity which is caused by an incremental backup
> It is very convenient at backup time but may cause
> a lot of extra work at restore time.
Star includes consistensency checks at restore time and warns
you if you try to restore the wrong archive or use the
> Anyway, compression is nearly a must with large backups
> of system oriented files. Sysadmins tend to hate waste of
> media and of time. Especially if they have to change the
> media every few minutes.
This is why all recent tape drives include "hardware" compression.
> > ACLs are enabled by default on the UNIX file system since
> > more than 10 years and cannot even be switched off.
> At least for SuSE Linux it is necessary to add options
> to /etc/fstab . This is specific to the particular file
> system type. With reiser or ext2 this would be option "acl".
ACLs have been (silently) enabled on Solaris since 1994.
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