Hi,
I've done several 1000+ tape migrations, and it is a long run (mostly if you won't dedicate many drives at source and target storage pools - most customers prefer to allocate just one drive, as they use the rest of them for production).
You will face several particular issues with many tapes.
Some might be missed at all (registered in TSMDB but might not be physically found).
Others might have some read or write errors (forcing you to audit them).
You might have to run some audit volume & restore volume (hope you have double copy in place)
If all your tapes are checked in should be easier. If you have many tapes checked out, here is where you have to be smart carefully designing the approach.
Have in mind that some big files are stored in more than one tape. You won't be able to empty one tape without the one where the rest of the file resides.
I would recommend that you:
- Build a report to leverage the migration and send it daily to tape operators. (you will have to put some intel on selects appropriate to guide the process).
- Create an script so you can execute move data of each checked in volume automatically (so it does not require volumes that are out of the library).
Some might fail, many others will succeed.
You will find a bunch of tapes hard to move. These are all particular cases you will have to analyze one by one and determine what to do.
Might be tapes with damaged files. Tapes that have part of a file, and the other par is on a missing tape.
I would say 1% of the tapes might require particular approach. You can ignore them now, and focus on them at the end. It is easier.
Update all volumes with access readwrite and run the script
The report will tell you which ones become unavailable (that are the ones that were required to complete the move of a checked in tape. You should check them in).
As long as your LTO8 storage pool has one scratch, the migration or move data should occur up to the point at it founds no more scratch.
Destination storage pool size does not matter, as long as there is empty space to write. You can feed scratchs as you go.
Nicolas.
nperez@giux.com------------------------------
Nicolás Pérez de Arenaza
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Original Message:
Sent: Wed March 31, 2021 09:31 PM
From: Arthur 'Bobbie' Geronimo
Subject: Migrating a 4PB storage pool (LTO6) to LTO8 storage pool
Hi All,
I'm trying to migrate a LTO6 storage pool, 4PM to a LTO8 storage pool. The LTO6 storage pools is about 4PM, about 1300 volumes. When I created the LTO8 storage pool, estimated capacity is about 1PB. The migrate command will run with a message of success, but no data was moved. This might be attributed to the LTO8 storage pool capacity of 1PB. The migration is not moving data because the next storage pool is smaller than the primary pool. I have increase the number of scratch tapes to the maximum possible for the storage pool, but the capacity is still at 1PB.
I hope to get insights from you guys on how to move forward with this.
Many thanks.
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Arthur 'Bobbie' Geronimo Technician
EBIZOLUTION INC
Makati
+639178111514
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