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Re: Skip LTO-7 for LTO-8 in 2018-2019?

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Jerzy Zbyslaw
Re: Skip LTO-7 for LTO-8 in 2018-2019?
on Sep 6, 2018 at 7:32:11 pm

LTO6 tapes come in two formats MP (Metal Particle) and BaFe (Barrium Ferrite) and LTO6 drives happily accept both versions and I can pretty much confirm that LTO8 drives will not read LTO6 tapes and furthermore I will explain why this is so for two insurmountable reasons that I have gleaned from the internet.

(1) LTO drives cannot tell the difference as to whether a tape inserted into it is either a MP or BaFe tape and as far as it is concerned it is just a tape for that size specified.

(2) LTO8 drives use the new TMR head technology and if you were to use a MP tape in it then it would trash the TMR heads in pretty short order.

Hence taking those two things into account the LTO organization itself made a POLICY DECISION to blanket restrict outright LTO8 drives from ever accepting LTO6 tapes and I presume all LTO drive makers have probably coded up all the firmware on all LTO8 drives to do exactly that. If you want to read old LTO6 tapes you have two choices only in LTO6 or LTO7 drives. Could an LTO8 drive otherwise read an LTO6 BaFe tape? probably yes it could, but its never going to happen, have a read of these links especially the first one.

http://www.storagedna.com/lto8/

https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-lpg50082

https://www.ibm.com/support/knowledgecenter/en/STCMML8/com.ibm.storage.ts35...

It is likely but not confirmed that LTO9 will be able to read LTO7 tapes as there is no longer any reason for them not to do so as all LTO7 tapes were BaFe, it is unknown at this stage whether or not they will ever read Type 8M tapes.

***** if you see any documentation that says an LTO8 drive will accept an LTO6 tape then it is probably incorrect and do not believe it. *****

Cheers


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