>But in the case I encoutered, the 1 system was telling all the rest that >they should switch to the alternate, when they tried to switch they >entered the disabled wait.
SFM deals with loosing *signalling* connectivity, not with loosing I/O connectiviy to the sysplex CDS. If a system cannot access the primary sysplex CSD anymore, it *must* switch to the alternate and hence force all the others to do the same switch to keep integrity. If the other systems cannot access the alternate, then they have to wait state themselves. I am not aware that there are any weights applied to this process, and there is no external command to halt a CDS switch. It is unfortunate that you are/were not cabled to have a backup, but that is what IBMs recommendation has been for ages: Have two different paths to the sysplex CDSs that use different controllers and different fibers. >It seems that before each of the 7 systems (which are on the same site, >connected through CTCs, and XCF signalling structures in the CF in the >same site) agrees to switch to the alternate CDS (blindly trusting the 1 >system that reported the error) it should try to see whats best for the >sysplex -- try to switch 7 systems to an unaccessible alternate CDS and >enter a disabled wait or let only the 1 system that reported a problem >with the primary CDS enter a disabled wait. I understand what you are saying, but I don't think that is how the architecture works. Actually, I am not even sure that what you are describing couldn't lead to a split sysplex, one system switching to the alternate and remove awareness of the others, and 6 systems keeping on merrily without awareness of one. For the alternative you suggest, there *has to be* signalling connectivity, which I believe in your case was lost, too. The type of outage you had (as regrettable as it is) could have been avoided by sufficient cabling via independent fibers/paths/links/CFS in hopes that not both of them fail at the same time. Regards, Barbara -- Highspeed-Freiheit. Bei GMX supergünstig, z.B. GMX DSL_Cityflat, DSL-Flatrate für nur 4,99 Euro/Monat* http://www.gmx.net/de/go/dsl ---------------------------------------------------------------------- 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
