Bruce , Radoslav XD ist just asynchronous PPRC - and there is no guarantee when and what will be copied . It may take more then just a few seconds after the WRITE that the data is copied - depending on the load and the link capacitiy.
The good thing is - you can switch easily from PPRC-XD to PPRC and vice versa - f.e. to have the data copied constantly , then goto SYNCH on a time with less activity - and then you may suspend and FLASH or take Backups from another system . The switching process normally takes seconds only . Basically it is used for migration or creation of some test data - not for disaster recovery cause the data is mostly almost fuzzy. Frank Krueger As I understand PPRC-XD, it can be one or a few I/Os behind the primary volume. A dataset which was JUST closed on the primary (and thus valid) may be exposed to problems on the secondary if the failure occurs before all its I/Os (and the VTOC/VVDS update I/Os from CLOSE) can be mirrored. But datasets closed more than a few seconds before the failure should be OK (same 99%). ---------------------------------------------------------------------- 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
