Re: Replacing Shadowed Boot Drive

From: Meat Loaf (julie.dayton_at_comcast.net)
Date: 04/30/05 

Date: Fri, 29 Apr 2005 21:00:45 -0500

Chris wrote:

> OK, I can't count --- step 9 should read "6. above" .....sigh
>
>
> "Chris" <an.other@not_here.ca> wrote in message
> news:Ensce.13866$gA5.778961@news20.bellglobal.com...
> > You're going to a lot more trouble than I have in past situations:
> > 1. Shutdown system normally
> > 2. Remove the secondary shadow (physical) unit
> > 3. Replace with larger unit
> > 4. Boot from CD-ROM
> > 5. Mount the primary shadow unit with /OVER=SHADOW
> > 6. Perform image backup of primary shadow unit to new, larger unit
> > 7. Shutdown system
> > 8. Remove old (small) unit from primary slot
> > 9. Replace with new (larger) unit just copied to in 5. above
> > 10. Leave secondary slot empty
> > 11. Reboot per normal from the primary physical unit
> >
> > (an Analyze/Disk/Repair ahead of any of this is assumed -- the
> > AUTOGEN is purely your call as to whether you think the system
> > needs tuning)
> >
> > In my experience, at boot, the Shadow Server will read the location
> > of the shadow unit from the primary (I think that's how it works),
> > try to mount
> it,
> > fail because it isn't there, and continue with nothing more than a
> warning.
> > Once the system is up, put your 2nd new drive in the secondary slot,
> > initialize it (to be cautious), then mount it into the boot
> > shadowset. Depending on how full the drive is, an hour or so
> > later, it'll be up to snuff. This has worked in at least 3
> > instances in the past.
> >
> > CM
> > "Shawn" <shawnm1964@sbcglobal.net> wrote in message
> > news:1114781251.750555.105530@g14g2000cwa.googlegroups.com...
> > > Hi All,
> > >
> > > I have a 1000A 5/400 Alpha Server running OpenVMS 7.2-1 which
> > > currently utilizes Disk Shadowing on all the drives including the
> > > boot drives.
> > >
> > > The boot drive is made up of (2) 4.3GB shadowed disk drives. I
> > > am going to replace both of these drives with (2) 9.1GB Disk
> > > Drives and re-enable shadowing.
> > >
> > > I would like to list the steps I plan to follow and see if any of
> > > you have any suggestions or corrections my plan. I have no extra
> > > drives to copy the data from the system drives too, so I have to
> > > use a DLT Tape Drive. The backup command I am going to use is
> > > backup and then restore is my main concern.
> > >
> > > 1. Comment any scripts called from startup which mount any disks.
> > > 2. Modify the modparams.dat file and set SHADOW_SYS_DISK to 0
> > > 3. Run the following command autogen savparams setparams.
> > > 4. Shutdown the application.
> > > 5. Show device/files to ensure all files are closed.
> > > 6. Run analyze/disk/repair to fix anything on the drive which
> > > could cause a problem.
> > > 7. Dismount a member of the shadow set.
> > > 8. Shutdown the system
> > > 9. Boot from an OpenVMS 7.2-1 CD and enter DCL mode.
> > > ***** These next steps I would appreciate your comments on******
> > > 10. Mount one of the system drives: mount/over=id dkb0:
> > > 11. Backup the drive to tape as an image:
> > > back/image/log/ign=label dkb0: mka500:dkb0.sav/save
> > > 12. After the backup completes dismount the tape and disk drive:
> > > dism mka500: dism dkb0:
> > > 13. Shutdown the server and replace the drives.
> > > 14. Boot again off the CD Drive.
> > > 15. Mount the new drive to be restored too. mount/for dkb0:
> > > 16. Restore Data from tape: back/image/ign=label/verify
> > > mka500:dkb0.sav dkb0:
> > > 17. After the restore has finished dismount tape and disk drives.
> > > 18. Shutdown the system and then boot from dkb0:
> > > 19. When server has come back up, modify startup scripts to mount
> > > drives as usual.
> > > 20. Modify modparams.dat file and set SHADOW_SYS_DISK = 1
> > > 21. Run the following command autogen savparams setparams.
> > > 22. Reboot the server.
> > > 23. After the server comes back up and all drives are mounted
> > > complete the final step of adding the 2nd drive to the shadow set.
> > > mount/system/noassist DSA0:/shadow=($1$dkc0:) ALPHASYS
> > >
> > > Let me know if you see anything I need to change or modify
> > >
> > > Thanks in advance
> > > Shawn
> > >
> >
> >

The other two replys are both correct and as long as you first take one
old disk and set it aside you should feel pretty safe. I personally
would stay away from starting out with the autogen because you may end
up tuning something that might make you think your new disk is a
problem.