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- From: op@holmes.acc.Virginia.EDU (Olaf Pors)
- Subject: Re: rootvg restores by inode
- Message-ID: <1992Sep4.130451.10370@murdoch.acc.Virginia.EDU>
- Sender: usenet@murdoch.acc.Virginia.EDU
- Organization: University of Virginia
- References: <1992Sep3.181334.13202@murdoch.acc.Virginia.EDU> <6420@vtserf.cc.vt.edu>
- Date: Fri, 4 Sep 1992 13:04:51 GMT
- Lines: 47
-
- In article <6420@vtserf.cc.vt.edu> valdis@vttcf.cc.vt.edu (Valdis Kletnieks) writes:
- >What I've always done is the following:
- >
- >(a) take a full backup once a week - in this case, a 'mksysb' flavor.
- >(b) The backup script touches /fulldump
- >(c) The incremental does a 'find / -newer /fulldump -print | backup -i'
- >
- >In case of failure, you just spin the mksysb - this gets you something
- >back that will at least *BOOT*. Then you just /etc/restore the incremental
- >over the now-semi-functional system.
-
- >I don't see that backup-by-inode is a big issue - the functionality
- >is there via other means.
-
- I think you must have missed my original posting on this
- issue. Your solution unfortunately brings back files that
- were removed between the incremental restores. This could
- possibly overflow the filesystem.
-
- There's another problem: your restore of the mksysb tape
- has created a bootable system. Great, you boot the
- thing. Now, you attempt to restore files from the
- incremental tapes, and in most cases you'd be ok.
- However, there may be some files on a tape, such as a new
- version of a shared library, which cannot just be copied
- over top of one currently in use without crashing the
- machine. This is one reason why such things are done from
- a RAM filesystem. Knowing this, you then find out that the
- "limited function maintenance shell" facility on a standard
- boot tape is not equipped to handle incremental restores.
- I don't know about you, but I don't need glitches, gotchas,
- and surprises when a major machine is down and needs to
- be restored. And this is the worst time to have to
- pick through the list of files on an incremental backup
- tape and hand-restore some of them.
-
- These are reasons why backup-by-inode is a big issue -
- the functionality is otherwise NOT there. The problem is
- that people come up with fairly good solutions, like
- yours, that work most of the time, so generally people are
- happy and don't complain. But that 1% of the time that
- the solution fails, you get a lot of wasted time, unhappy
- users, upset administrators, and bad sentiments against
- IBM. Why wait for this? Why not fix the whole thing
- right to begin with?
-
- Olaf Pors
-