# $Id: README,v 2.0 2004/01/11 20:47:39 ksb Exp $

This is sync backup partitions, the C version.  It now depends
on my "mk(1)" tool, as well as mkcmd(1).


The shell script version (see sbp.ksh) was a good prototype, but it
suffered from a few bugs:
	The newfs options are hard coded in the script, not the vfstab

	Matching the backup to the primary is very primative

	The backup must be on t1 (c0t1d0) and the primary on t0 (c0t0d0)
	or the reverse.  It would be great if the device was just text.

	Missing manual page, on-line help, and version features.

	Only works on Sun 2.X; we'd like FreeBSD as well.

	The order of the partitions mattered a lot before

	Name of some commands were not portable (viz. ufsrestore vs restore)


The code is clear enough as a script, there are features we'd like to
keep:
	The trace, but do not do it feature (now -n, -v)

	The simple parts (like fixing the vfstab for you)


We should add some features as well:

0) cross platform code!
	+ FreeBSD (native port for this app)
	+ Solaris 2.5.1, 2.6, 7.0 (4.1.4 ?)
	+ HPUX9 if it is easy

1) it should accept the backup (and primary) filesystems on any device
	+ we can move alternates around, even across controllers
	+ we can move primaries around, even better
	+ backup on NFS?  Maybe backup on another host via rsync?

2) it will mount the backups async to speed the copy
	+ this make FreeBSD copies fly

3) it will use newfs options hidden in the fstab (vfstab, checklist) file
	+ they can be on the primary or alternate entry
	+ they can be tuned per fs
	? build in the "auto-tune" code from itune?

4) it will copy just a single (or subset) the the partitions from the
   command line:
	+ in that way (*when you are booted alternate*) you can copy only
	  the broken partition back, example
		sbp -v /usr
	  will copy the active /usr to the /backup/usr

5) we can have multiple backup partitions (/backup1 might be another backup).
	+ in that way
		sbp -m /backup1 / /usr /var
	  might just backup a minimal system or
		sbp -m /archive /sybase/data
	  might backup the database partition alone


See also:
	Get rsync-2.6.0 from http://rsync.samba.org/.

--
ksb, at HOME Jan 2004