Hello list,
We are planning to use ATS STAR to share our TS7700 tape units among our systems. The main reason is a problem specific to the TS7700 (and probably other VTSs) that did not exist in our STK physical tape environment: when a system goes down (for whatever reason) and it had tapes mounted, these tapes remain mounted on the TS7700 units and are therefore not available to other systems. The only way to get the tape available again is to dismount it and that can only be done from a system that has the unit online. We started our initial TS7700 configuration with tapeunits dedicated per system, because the TS7700 provided more than enough of them and we could drop our MIA tapesharing software. But soon we found the problem that tapes could only be dismounted by the owning system and if that system was down for a longer period (software problems, hardware maintenance, scheduled unavailability of testsystems), the mounted tapes were unavailable for that period. The obvious solution was ATS START tapesharing. In this situation, a tape mounted by a disappeared system can be dismounted by another sharing system. Chapter 16 of Setting up a Sysplex describes sharing tapeunits in a sysplex and explains how sharing in a sysplex works most optimal. This does not cover the situation that a tape mounted by a testsystem can be dismounted when the entire test-sysplex is down. The last paragraph of chapter 16 suggests that tapeunits can be shared by systems outside the sysplex, either supporting ATS STAR or not. This sounds reasonable, since the ASSIGN is done when a unit is allocated for AS units or at vary online for non-AS units and so serialization is guaranteed. See ATS STAR APAR OW50900 for details. My question is: Does anybody share ATS units over sysplexes and does this work? What happens when a system allocates a unit and that unit is assigned to a foreign host (AFH)? Does allocation go through allocation recovery and select another unit, or does it wait for the device to become available? Thanks, Kees. ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ********************************************************************** ---------------------------------------------------------------------- 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
