(IBM Mainframe Discussion List) wrote:
... The acronym stands for DASDM Interrupt Recording Facility. The bit is (or was) turned on at the beginning of a long process in which multiple DSCBs had to be updated. When all updates were done, the bit was turned off. If on a new allocate the bit was found to be on, then DADSM knew that the free DSCB chain was not necessarily correct, so DASDM would automatically rebuild the format 3 DSCB chain. It was called the dirty bit because (a) "DIRF" sounds a lot like "dirt" and (b) the F3 DSCB chain was possibly dirty/contaminated/non-kosher/hosed if the bit was on.
Talk about a digression. Phil is talking about the WRONG bit altogether! The VSE bit that wasn't mapped was x'20' in DS1FLAG1 -- not x'04' in DS4VTOCI. Sheesh!
-- Edward E Jaffe Phoenix Software International, Inc 5200 W Century Blvd, Suite 800 Los Angeles, CA 90045 310-338-0400 x318 [EMAIL PROTECTED] http://www.phoenixsoftware.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
