WARNING (Re: SUMMARY: dump multiple filesystems on one tape?)

From: Casper Dik (casper@holland.sun.com)
Date: Wed Jun 14 1995 - 00:25:27 CDT

WARNING, the following DOES NOT WORK:

>Yves Hardy writes about a third option:
>> What you can do for example is to mount the partition number 2
>>(for SunOS : /dev/sd0c or for Solaris : /dev/dsk/c0t3d0s2) and there you will
>>be able to make a full dump of your disk, because, by default, the partition
>>number 2 is contains all the data of your different file system.

Dumping /dev/sd0c or /dev/dsk/c0t3d0s2 will only dump the first filesystem
of the disk and then only if the partition containing that filesystem
starts in cylinder 0. So this will usually give you a dump tape with only
/dev/sd0a or /dev/dsk/c0t3d0s0.

This doesn't work either;
trying to dump two filesystems with one dump command:

 ufsdump 0f /dev/null / /ufs1
 ufsdump 0f /dev/null /dev/dsk/c0t3d0s0 /dev/dsk/c0t1d0s0

will also result in only one filesystem dumped
(believe me, I just tried this to make sure)

Please remember that dump/ufsdump back up a *filesystem*, not a
partition. It can therefor only dump *one* filesystem, or
part thereof, at a time.

Dumping multiple filesystems is only possible by using multiple
dump commands.

Posted directly to sun-managers as problems with using an invalid dump
method may go unnoticed until the backups are needed.


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