Phy Operation field in mode page 19

George Penokie gop at
Wed Apr 2 13:08:58 PST 2003

* From the T10 Reflector (t10 at, posted by:
* George Penokie <gop at>

For SAS Mode Page 19 (long format), the SAS phy mode descriptor (Table 145)
defines a Phy Operation field that corresponds to the SMP Phy Control
function.  The text in only states that the field is defined in (SMP Phy Control) but it leaves open the fact that it might be
changeable, which would imply that this field could be used to do one or
more of the following functions:


The only one that could be used by a SCSI target is DISABLE and that one
probably should not be allowed because a rogue Initiator could disable both
phy's on a Target and never be able to talk to the Target again (without a
power cycle or a OOB/HARD RESET).

I would recommend the Phy Operation field be made reserved or restricted on
mode page 19h.

Bye for now,
George Penokie

Dept 2C6  114-2 N212
E-Mail:    gop at
Internal:  553-5208
External: 507-253-5208   FAX: 507-253-2880

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