Yi Ming, HDS Shadowimage has a Consistency Group function that allows you to get point-in-time, multivolume consistency across multiple 9900V and USP. It uses the DFP timestamps that are generated for XRC in the same way as Nanocopy (well spotted). It means you can include other DB, journals and files that do 2-phase-commit processing with DB2 and have a real (as opposed to fuzzy) point in time backup across a whole application.
While IBM is using the Hitachi's Nanocopy technology, I have not read that they are using it for multi-controller flashcopy. I'm happy to be corrected, but I think you still have to do a log suspend (quiesce) for multiple ESS/DS8K Flashcopy, and in that case related file systems cannot participate in the point in time. I think Flashcopy Consistency Group is limited to a single controller boundary. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Yi Ming > Sent: Tuesday, 12 July 2005 4:39 PM > To: [email protected] > Subject: DB2 and flashcopy2 > > Hi, > Do I still need to quiesce DB2 to do a PIT copy that can be used for DB2 > recovery with flashcopy 2 ? Redbook SG24-5680-04 suggest that it is no > longer required. Looks like the fruits of IBM/HDS Nanocopy cross > licensing ? > > 2.2.6 FlashCopy Consistency Group > "..the ESS will hold off I/O activity to a volume for a time period by > putting the source volume in extended long busy state. Thus, a window can > be > created during which dependent write updates will not occur, and FlashCopy > will use that window to obtain a consistent point-in-time copy of the > related volumes" > > Thanks > Yi Ming > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
