SSC-4: Programmable Early Warning question

Ballard, Curtis C (StorageWorks) curtis.ballard at
Thu Oct 1 15:21:49 PDT 2009

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In the interest of having a complete specification it would be appropriate to
specify behavior although I would hope that an application would never make
that mistake.
Rather than reject the command I would be inclined to have a device specific
maximum PEWS zone and report a recovered error with the PEWS zone set to the
maximum allowed.
Curtis Ballard
Hewlett Packard
From: owner-t10 at [mailto:owner-t10 at] On Behalf Of Kevin D Butt
Sent: Thursday, October 01, 2009 1:46 PM
To: t10 at
Subject: SSC-4: Programmable Early Warning question
I wonder if we should protect the programmable early warning from being set
to too large a value.  Should we add some statement like the following to
If PEWS field of Device Configuration Extension mode page is set to a value
larger than the tapes capacity, then the Mode Select should be rejected with
Kevin D. Butt
SCSI & Fibre Channel Architect, Tape Firmware
MS 6TYA, 9000 S. Rita Rd., Tucson, AZ 85744
Tel: 520-799-5280
Fax: 520-799-2723 (T/L:321)
Email address: kdbutt at

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