It appears that while in Single User Mode, it is OK to overwrite
the / and /usr partitions with what is on the tape (as long as it
is valid for those partitions).
Also noted that the disks can be re-labeled at this point as well,
but I'm not needing to change the partitioning, since that will
stay the same (I made my /usr far large enough now to handle just
about any revision).
Noted that Vdump and Vrestore work with both UFS and ADVS
Noted that when using Vrestore the -s # (file set # is not available)
and must be moved manually before Vrestoring. (However, I'm saving
data on separate tapes for each partition, so that's not a problem)
Also suggested was the use of btcreate.8/btextract.8 for bootable tapes
(I'm currently on 3.2c, and it didn't appear to be available)
And lastly, not only backup, backup x 2 and most importantly, test
for the last file on each backup to make sure the backup's are valid.
Thanks to Alan Davis, Steve Dyer, Bruce Platt, Darryl Cook & Colin Walters
George
>-----Original Message-----
>From: George Gallen [mailto:ggallen_at_slackinc.com]
>Sent: Tuesday, September 26, 2000 11:53 AM
>To: 'tru64-unix-managers_at_ornl.gov'
>Subject: upgrade/recovery question
>
>
>This may seem quite basic, however, it's something I have not
>done before
>so....
>I didn't see anything in the archives that directly fit my question...
>
>We want to do an OS upgrade, actually, since the from and to will be
>generations
>apart, just upgrading won't work. I will need to do a fresh
>install and then
>retweak
>the system (luckily on our end, we don't have many services to setup).
>
>That's not the problem. The question is what happens if all
>does not go well
>and
>we need to go back to our old rev. The last time I did this, I
>also replaced
>all the
>drives, so we pulled the old drives, put in the new ones and
>loaded the OS
>and
>tweaked the system, then restored the data. If there was a
>problem , all we
>needed to do was swap back in all the old drives and power back up.
>
>I don't have that luxury this time. So First we will be
>backing up the data
>to
>tape, as well as each filesystem to it's own tape for the data.
>
>Basically, we can't have the system down for very long (over a
>weekend would
>be fine), but If after the installation, I can't get things up
>95%, I will
>need to
>revert to the old rev, until we can try again.
>
>How do I backup the "system" and load it back in if I need to reset the
>system
>like before?
>
>I'm assuming that I'd need to boot from the old CD, go into
>single user mode
>then use restore to put the data back into "/" and "/usr", then reboot
>
>To save my "/" and "/usr" partitions to tape (UFS)
>
>Boot to single user mode: (boot -fl s)
>
>dump 0f /dev/rmt0a /
>dump 0f /dev/rmt0a /usr
>
>Or am I better off using dd?
>
>To Restore my "/" and "/usr" partitions from tape (UFS again)
>
>At the >> prompt, I'd enter 'boot -fl s rz6c'
>
>This is where I'm at a loss. Do I mount "/" and "/usr" then
>use restore to overwrite itself?
>
>
>Thanks
>George
>
>George Gallen
>Senior Programmer/Analyst
>Accounting/Data Division
>ggallen_at_slackinc.com
>ph:856.848.1000 Ext 220
>
>SLACK Incorporated - An innovative information, education and
>management
>company
>http://www.slackinc.com
>
Received on Tue Sep 26 2000 - 21:30:56 NZST