> It also reminded me that long running ASM Chains are not a good thing. Until > the Channel Program ends or suspends none of the page-ins in that chain are > available to use. It's like a train - doesn't matter how many carriages > there are, everyone finishes the journey at the same time.
You forgot one implementation item - PCI interrupts. ASM *knows* when segments of I/O have completed because of PCI interrupts, with or without completion/suspension of the channel progam. Long running ASM chains don't cause the issue you describe. Greg ---------------------------------------------------------------------- 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
