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Re: Details on Media Auxiliary Memory in partitioned LTO5+ tapes

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scsirob wrote:
> 
> Hi all, not sure if anyone is still around in this group with a bit
> of tape background?
> 
> I am trying to emulate a tape system. Works quite well, but I'm lost
> on the details of emulating the MAM chip.
> 
> In LTO-5 and up, tapes can be partitioned. The commands to access the
> MAM chip (Read/Write Attribute) allow you to specify a partition as
> well. 

AFAIK all LTO media (back to LTO1) have a builtin MAM.
Looking at the manuals of 15 year old LTO1/2 drives shows that there
is MAM support and the READ ATTRIBUTE and WRITE ATTRIBUTE commands
already present.

> What I cannot deduct from the T10 standards and SCSI reference
> manuals, is what attributes to return for any particular partition.
> Only a few of them are specific to a partition, but the specs claim
> that the drive returns all attributes (starting with x).

Just to be sure that we are talking about the same things:
You want to create/emulate a SCSI target device according to SSC that
implements the optional READ ATTRIBUTE and WRITE ATTRIBUTE commands
according to SPC?

> Several attributes can be interpreted as belonging to the entire tape
> (lifetime read/written), but could be per partition as well.
> Others are clearly per tape (mfg date, serial no).

Can you tell a bit more about what you want to do. Do you want to
emulate a specific LTO drive (if yes, which one?) or do you want
to create a generic tape emulation with support for partitions?

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Thread

Details on Media Auxiliary Memory in partitioned LTO5+ tapes scsirob <scsirob@gmail.com> - 2018-02-10 23:36 -0800
  Re: Details on Media Auxiliary Memory in partitioned LTO5+ tapes Michael Bäuerle <michael.baeuerle@gmx.net> - 2018-02-11 11:41 +0000
    Re: Details on Media Auxiliary Memory in partitioned LTO5+ tapes scsirob <scsirob@gmail.com> - 2018-02-28 05:47 -0800
      Re: Details on Media Auxiliary Memory in partitioned LTO5+ tapes Michael Bäuerle <michael.baeuerle@gmx.net> - 2018-03-04 11:25 +0000
        Re: Details on Media Auxiliary Memory in partitioned LTO5+ tapes scsirob <scsirob@gmail.com> - 2018-03-12 02:03 -0700

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