Potential exposure to job aborts in z/OS environment with zHPF enabled running on a DS8870 with R7.1
z/OS clients with zHPF enabled running on a DS8870 with R7.1 bundles below 184.108.40.206 are exposed to job aborts due to Channel Errors (IOS071I START PENDING)
The job aborts due to Channel Errors (IOS071I START PENDING) are caused by an internal condition of the DS8870 when zHPF is enabled.
Based on the number of transferred bytes per track the calculation for the amount of SMBs (sequential memory buffer) the DS8870 needs to allocate for transferring data over the channel may be wrong.
This wrong calculation leads to a code exception or an I/O hang in the DS8870 which may result in job aborts and IOS071I START PENDING messages.
The issue was introduced in the R7.1 GA bundle 220.127.116.11 and fixed in the bundles identified in the Resolution section below.
R7.1: all Microcode bundles below 18.104.22.168 R7.1 SP3, multiple field occurrences observed, all on bundle 22.214.171.124
Disable zHPF until a service window can be scheduled to update DS8870 firmware to a bundle containing the fix.
A DS8870 microcode build to fix this issue has been made available in Bundle 126.96.36.199 or higher.
188.8.131.52 R7.1 SP3
184.108.40.206 R7.2 GA
For those customers upgrading code from R7.0 to R7.1 and running zHPF the minimum recommended microcode level is 220.127.116.11 (R7.1 SP3)
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