Question about data compression

Erich Oetting erich_oetting at stortek.com
Mon Nov 3 10:35:12 PST 1997


* From the T10 (formerly SCSI) Reflector (t10 at symbios.com), posted by:
* Erich Oetting <erich_oetting at stortek.com>
*
Bob.Snively at Eng.Sun.COM wrote:
>An interesting observation was made concerning SSC, at least at its
>revision 10.
>
>I have not found any specification of the interaction between the
>SELECT DATA COMPRESSION ALGORITHM value defined in the Device
>Configuration Page and the numerous managing fields in the
>Data Compression Page.  As an example, after having set up the
>Data Compression Page very carefully to compress, can I then disable 
>compression
>by setting the SELECT DATA COMPRESSIN ALGORITHM value to zero?
>
>Have I missed something?

In the September SSC/SMC working group meeting we discussed the 
conflict between the page and field.  From the minutes (97-248-r0):

>5.2 Conflict between Data compression page and field.  (Penokie)
>
>George pointed out that the standard does not specify how to handle the 
>case where the Data Compression page and the Device Configuration 
>Page are both sent.  The group decided that the field in the Device 
>Configuration page should be ignored if the Data Compression page is
>also sent, and accept this as a valid letter ballot comment.

Does this answer the question, or do we need to discuss the issue
again this week?

   Erich Oetting


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