[SunHELP] query about ufsdump

[Dunbar, Brian]

Eh.  We do a ufsdump on volumes while they are mounted - but at 3 a.m. when
no one is using the system.  I too, when I arrrived (my first 'real' unix
admin job) asked why we didn't unmount the volumes like the book said to do,
and my manager had a good technical reply as to *why* it was okay.

I DO recall that, years ago  when I was backup admin on an AIX system
hosting a 'mission critical' database, we forcibly logged all users OUT,
then ran the backup, and let everyone back in when the backup script was
finished.  I didn't know beans about unix then, just following the
directions in a binder...

-----Original Message-----
From: TAG DBA [mailto:dbatag at tatainfotech.com]
Sent: Thursday, November 29, 2001 11:28 PM
To: 'sunhelp at sunhelp.org'
Subject: [SunHELP] query about ufsdump


Hello,
A number of books give the following kind of examples for using ufsdump
$ ufsdump 0ucf /dev/rmt/0  /s3104/home1

Note that they are referring to the mount point - meaning that the file
system
is mounted. However Sun manuals say that one should preferably unmount the
filesyste, before taking a ufsdump. Which means my example would look like:
$ ufsdump 0ucf /dev/rmt/0 /dev/rdsk/c0t1d30s4

This confuses me - is it allright to take a ufsdump while the file system
being backed up is mounted (and perhaps potentially in use). Will I be able
to
restore and recover from such a dump ?

Thanks and Regards,
~aslam
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