On 01/02/2016 05:46 PM, Joel C. Ewing wrote:
> On 01/02/2016 04:04 PM, Stephen Mednick wrote:
>> Looking to find the answer to the question "in which year did IBM release
>> its DF/DSS backup & restore product.
>>
>> Cheers,
>> Stephen Mednick
>> Computer Supervisory Services
>> Sydney, Australia
>>
>>
>> Asia/Pacific representatives for:
>> Innovation Data Processing
>>
> The product existed in 1985 when we began conversion (from DOS/VS) to
> MVS/XA.
>
> The z/OS 1.8 DFSMdss Storage Admin Guide has 1984 as its earliest
> copyright date.
>
> During the 2007 ibm-main discussion of the dss undocumented reset of
> "changed bit" on volume restore, potential data loss issues therefrom,
> and eventual problem circumvention, IBM's resistance to correcting the
> problem was based on the bug having been introduced into the code in
> 1979; so the product must have been around in some form as early as 1979.
>
> Any one else know of earlier existence?
>
> As far as I'm aware ADSM product (which backed up non-mainframe files to
> mainframe tape) mentioned in Wheeler post is a totally unrelated to DSS
> product (which manipulates mainframe DASD and data sets).
>
Additional follow up:
An on-line copy of "Aug 83 Product Summary Software" shows Release 1.0
(5740-AM6) of DF/DSS was available at that time for OS/VS1 (with later
releases available for OS/VS2). The description says it was developed
as part of
the support for the 3375 (introduced January 1979) and 3380 (introduced
June 1980):
"Data Facility/ Device Support (DFDSS) provides the data management
support for the 3380 Direct Access Storage, a high-speed, large
capacity, non-removable media direct access storage device (DASD) and
the 3375..."
If the introduction of the IBM 3375 DASD is indeed the earliest
motivation and the code existed in 1979, that suggests 1979 may very
well be close to the initial release of DF/DSS.
--
Joel C. Ewing, Bentonville, AR [email protected]
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