Tape Alert Log Page and the PC field

Dennis.W.Painter at seagate.com Dennis.W.Painter at seagate.com
Mon Oct 21 10:18:24 PDT 2002


* From the T10 Reflector (t10 at t10.org), posted by:
* Dennis.W.Painter at seagate.com
*

Hi Kevin,

For historical reasons what would be the PC field in the TA log page is
reserved.

I think what you are asking is "how can the client determine what TA flags
are supported"

You should be able to issue a mode select to page 1Ch with the Test Flag
Number set to 7FFFh (set all supported flags). Then Log Select the TA page
and the flags set are the flags supported.

Hope this helps

Cheers
Dennis



                                                                                                                                
                    "Kevin D                                                                                                    
                    Butt"                To:     t10 at t10.org                                                                    
                    <kdbutt at us.ib        cc:                                                                                    
                    m.com>               Subject:     Tape Alert Log Page and the PC field                                      
                    Sent by:                                                                                                    
                    owner-t10 at t10                                                                                               
                    .org                                                                                                        
                                                                                                                                
                                                                                                                                
                    10/18/2002                                                                                                  
                    04:08 PM                                                                                                    
                                                                                                                                
                                                                                                                                




* From the T10 Reflector (t10 at t10.org), posted by:
* "Kevin D Butt" <kdbutt at us.ibm.com>
*
I have a question about how the PC field is used in the industry in
relation to the Tape Alert flags (log page 0x2E).

A PC field of 10b is supposed to return the "default threshold values" of a
log page.

In the TapeAlert log page all 64 parameters are to be returned regardless
of whether or not they are supported.

I have been informed that in the industry, application clients use a
default threshold value of zero to indicate that a parameter is not
supported.  Is this true?

What is implied by the standards regarding the default threshold value when
a parameter is not supported.  Especially in the case of the Tape Alert
page?

Thanks,

Kevin D. Butt
Fibre Channel & SCSI Architect
IBM Tape Microcode,
6TYA, 9000 S. Rita Rd., Tucson, AZ  85744
Tie-line 321; Office: 520-799-5280, Lab: 799-2869, Fax: 799-4138, Email:
kdbutt at us.ibm.com


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