When I was migrating from LTO2 to LTO4 I  created new new LTO4
devclass and based on them new LTO4 stgpools and set them as target
for migration and then moved all the data from LTO2 stgpool to LTO4.
If you would prefer to not move the data actively you can set LTO4
pools as target stgpool for the reclamation of LTO2 pools. That will
move the  data gradually over time from LTO2 to LTO4.
--
Warm regards,
Michael Green



On Thu, Dec 24, 2009 at 1:28 PM, Baker, Jane <Jane.Baker AT clarks DOT com> 
wrote:
> We have a TS3500 which is physically partitioned to allow for LTO2 &
> LTO3 mixed media.  We're planning on replacing the LTO3 drives with LTO4
> drives early in January and obviously we'll need to balance the number
> of LTO3 & LTO4 tapes in the library as the data migrates to LTO4.  Is it
> possible to set the LTO3 tapes to readonly to force writes onto the new
> tapes or do I have to migrate the tapes manually?
>
> Just concerned that if I set the LTO3 tapes to read only it'll flag
> loads of errors about the status of the tape.
>
> I guess what I'd like to happen is to swap out the drives, checkout
> spare LTO3's checkin some spare LTO4's and set the 3's to readonly so
> that they can be restored from but not written too then it's just a case
> of balancing the scratches until all data is migrated to LTO4.
>
> Is it as simple as I'd like it to be or are there any gotcha's in there?
> Someone out there will probably point out a glaring flaw in my plan, but
> that's what the list is for after all.
>
> :0)
>
> Any comments welcomed.
>
> Happy Christmas!
>
> Regards,
> Jane.
>
>
>
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