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z/VM Service: Red Alerts


This page is intended to provide information about potential high-impact items and in some cases prior to the opening of an APAR. Note that when a release level reaches the end of service, we intend to remove the item from the list.


Date Description
10 July 2017 APAR VM66026 is in error.
Apply PTF for APAR VM66036.
17 Nov 2014 VM65544 is now available
10 Nov 2014 VM65544 is required prior to DS8K R7.4
13 Oct 2014 VM65619 required to avoid storage corruption for guests greater than 4G

 


  • July 10, 2017

    APAR VM66026 is in error. See problem resolution.

    Do not apply the PTF for "VM66026 MONITOR ENHANCEMENTS FOR HYPERPAV / PAV AND ZHPF."

    USERS AFFECTED:

    All users of HyperPAV and zHPF

    PROBLEM DESCRIPTION:

    It may cause serious problems if you are using system-attached HyperPAV / PAV alias devices. This APAR closed on June 7, 2017 and is NOT on an RSU. "VM66036 PEVM66026 ABENDPRG006 ON SYSTEM ATTACHED ALIAS I/O" has been opened to fix this, and the fix is in our internal test phase.

    These alias devices can be attached to the system with either the SYSTEM_ALIAS configuration statement in SYSTEM CONFIG, or the CP ATTACH command.

    PROBLEM RESOLUTION:

    Apply PTF for APAR VM66036


2014: A PDF version of 2014 z/VM Red Alerts can be found here.

  • November 10, 2014

    APAR VM65544 is now available.

    WARNING: APAR VM65544 must be applied prior to DS8K R7.4 to avoid outages

    USERS AFFECTED:

    All users of z/VM planning to move to the DS8K R7.4 level

    PROBLEM DESCRIPTION:

    Installations using z/VM who are planning to move to the DS8K R7.4 level MUST apply the PTF for z/VM APAR VM65544 prior to upgrading their DS8K. Failure to apply this APAR may result in unplanned z/VM outages when any PPRC operation is initiated, whether new R7.4PPRC function is exploited or not. PTFs will be available for supported z/VM releases, 5.4, 6.2, and 6.3. DS8K R7.4 contains support for Multi-Target PPRC.

    PROBLEM RESOLUTION:

    Apply APAR VM65544.


  • October 13, 2014

    (10/14/14 correction:) APAR VM65538 is in error

    For any guests with storage greater than 4G, using minidisk cache (MDC) or Read Track Data CCWs may result in a guest storage overlay.

    USERS AFFECTED:

    All users of z/VM 6.3 with APAR VM65538 running guests > 4G (eg. Linux).

    PROBLEM DESCRIPTION:

    VM65538 incorrectly clears the high half of a register containing an IDAW data address. This causes addresses greater than 4G to become corrupted. The usual result is not being able to boot Linux. which uses the Read Track Data CCW with an IDAW address >4G when the guest storage is 4G or greater.

    The use of MDC may also result in data being stored at the wrong address for any guest with storage >4G. MDC must remain disabled for the entire life of the guest.

    PROBLEM RESOLUTION:

    There are two options to avoid the problem.

    1. Apply APAR VM65619.

    2. Restrict guests to less than 4G.

 
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