moonchild Absent Member.
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Migrating from STK tapes 9940B to LTO4

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Hi All,

What is the fastest and reliable process to migrate 1000 STK 9940B tapes to LTO4s?

And any idea how long it might take?

Thank you in advance.

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Steven E. Prott Absent Member.
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Re: Migrating from STK tapes 9940B to LTO4

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Shalom,

DP can be used to restore the data to disk, other location, then you can re-write the data back to tape in DP format.

dd could be used, but DP might be able to detect the change.

Best strategy really is to keep the old drive around, maybe even off service contract for a few years until the retention period on the old tapes is expired.

SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
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OldSchool Absent Member.
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Re: Migrating from STK tapes 9940B to LTO4

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I'd think that would depend on what wrote the original tapes to begin with, which you didn't bother to indicate.

for example, you might be able to simply "dd" them, or you might have to use features of the application that wrote them to copy them, which I believe would be required for DataProtector.
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moonchild Absent Member.
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Re: Migrating from STK tapes 9940B to LTO4

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the application used is HP Data Protector
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Steven E. Prott Absent Member.
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Re: Migrating from STK tapes 9940B to LTO4

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Shalom,

DP can be used to restore the data to disk, other location, then you can re-write the data back to tape in DP format.

dd could be used, but DP might be able to detect the change.

Best strategy really is to keep the old drive around, maybe even off service contract for a few years until the retention period on the old tapes is expired.

SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
moonchild Absent Member.
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Re: Migrating from STK tapes 9940B to LTO4

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But by dd'ing I will loose the extra space on LTO4s, NO?

If the original tapes where backed up using other sw than DP will i still be able to restore them using DP?
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OldSchool Absent Member.
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Re: Migrating from STK tapes 9940B to LTO4

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Me:
"might have to use features of the application that wrote them to copy them, which I believe would be required for DataProtector."

Moonchild:
"the application used is HP Data Protector"

S.E.P:
"DP can be used to restore the data to disk, other location, then you can re-write the data back to tape in DP format."

=========================================================================

With DP, you can use the Object Copy functionality to copy Objects from one media-type to a different media type (among other things). Open the GUI help and do a Search on "migrate to another media" and/or "advanced object copy tasks"

IF all 1000 media still have entries in the database, it should be straight forward. If not, you'll have to import the catalog(s) then do the copy operation.

I don't believe "dd" can be used for this (nor should it be).

=========================================================================



Moonchild:
"If the original tapes where backed up using other sw than DP will i still be able to restore them using DP?"

Why ever would you think that. DP handles DP only. It may tell you a tape is in "tar" format, but it certainly won't copy / restore from it.

If you've tapes written by other software, then, depending on what it was, you might have to carry it forward as well.

OldSchool Absent Member.
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Re: Migrating from STK tapes 9940B to LTO4

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as for the amount of time required to do this, I'd think that would depend on factors such as:

* what systems(s) the drives are connected to?
* will the data have to traverse the network when going from one drive to the other?
*speed at which data can be pulled off the original drive -vs- speed of the LTO4. I'd expect the new drive to "shoe-shine" (not stream

I'd be suprised if you can copy the media in much less time then the duration of the original backup session.

If you can write off the data on the old tapes, I'd consider that. If not, see if its possible to retain the old drive(s).

Also, be aware that this has licensing implications. If the "old" drive is part of some kind of library, you'd need to have sufficient licensing to cover it and any "new" library (assuming the LTO4s are in such).

Also, be aware that it can be extremely difficult to provide the thruput necessary to effective drive an LTO4.
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moonchild Absent Member.
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Re: Migrating from STK tapes 9940B to LTO4

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Thank you OldSchool for the info.

How about compliance? if the data on the STK tapes should be retained for 5 years. whn copying data to the new LTO4s would the timestamp change?
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OldSchool Absent Member.
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Re: Migrating from STK tapes 9940B to LTO4

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compliance issues: talk to your auditor. 5 year retention seems a little "strange", as most legal requirements I've seen are usually for 1 or 7 years.

date issue: I would think that the date information on the objects remains what the original had. the DP catalog will probably have a date for the object copy session that corresponds to the data/time of the copy being run.

depending on where the "compliance" issue comes from, it may be sufficient to have the tapes in hand. (i.e does the requirement state "retain for 5 years" or does it say "retain backup for 5 years in a readable condition") implying that you have to have the tape, not requiring you to be able to read it.

I'd really consider keeping the "old" drive available. Consider that if if takes 2 hours to dupe each of the 1000 tapes, you will have occupied one lto4 drive for a full 8 hour shift each working day of the work year, assuming no setup time / failures / availability issues.
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CBee Absent Member.
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Re: Migrating from STK tapes 9940B to LTO4

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The best and relyable way I see for moving to new tapes is to keep the old tapes as you would and just start using new tapes.

As the old tapes (cartridges, drive and maybe library) are only needed for restore, their wear and tear is fairly less than with regular backups. But you do need to keep them available, just incase. And best to use them once in a while (once a month) to keep track of the usability, specially for the tape-drive.

What would you have done with the tape-cartridges if you did not move to new media? Just keep them stored? Best to do the same now.

For what its worth, DP keeps track of the write usage, not the read-usage.
Things that go automatically, automatically go wrong...
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