On Tue, 17 Apr 2007 00:23:28 -0500, Russell Witt <[EMAIL PROTECTED]> wrote:
>Oh, good one. I remember back in the olden days with 3420's shared between >two systems (no MIA, no tape-sharing software); if CPUA was using the drive >and someone accidently varied the drive online to CPUB the job running on >CPUA kept writing to the device even though it had been un-wound. Worst part >was that the job on CPUA might not even abend if the operator saw their >mistake and cancelled the job on CPUB before it tried to write any data. >CPUA kept writing data without knowing that the device had been un-wound. So >we had to actually cancel the job and restart it; of course we had to use a >checkpoint restart from before that specific volume had even been mounted >yet so we lost a lot of time. > >Russell > With 3420s 2 systems could write on the tape at the same time. With 3480 and newer (including virtual implementations), there is an assign from the control unit that will prevent that. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group: G-ITO mailto:[EMAIL PROTECTED] z/OS and OS390 expert at http://searchDataCenter.com/ateExperts/ Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.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
