[T10] SSC-5 and inclusion of D_BOPC bit in commands that support IMMED bit

Tim Jones tjmac at tolisgroup.com
Wed Aug 17 11:34:57 PDT 2016

Hi Folks,

In dealing with modern LTO-6 and LTO-7 drives, we’ve noted (specifically for IBM devices) that commands set with the IMMED bit unset have started to act as if the bit is set with what should be long running tape motion (SPACE, LOCATE, etc.) commands returning from the device server immediately.

After digging through execution logs and discussing this with our HPE tech team members, we have finally uncovered the new D_BOPC bit that can affect the expected results of such commands.  This is not mentioned in the current SSC-5 draft rev 02b, dated Jul 1, 2016.

I recommend that the D_BOPC information be added and that all commands utilizing the IMMED bit be updated to include a reference to the affect of the D_BOPC bit on those commands.

Thanks for your consideration,
Tim Jones				tjmac at tolisgroup.com
President/CTO			http://www.tolisgroup.com
TOLIS Group, Inc.
480-505-0488 x227			480-505-0492 (fax)

BRU ... Because it's the RESTORE that matters

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