Notification
Risk classification
HIPER (High Impact and/or Pervasive)
Risk categories
Data Access Loss
Affected Domain
Any TS7770 with code level R5.3 GA (8.53.0.63) or R5.3 PGA1 (8.53.1.21)
Abstract
A problem has been found where TS7770 (3957-VED, 3948-VED) with code level R5.3 GA (8.53.0.63) or R5.3 PGA1 (8.53.1.21) may encounter a Sick but not Dead (SBND) state resulting in loss of access.
Description
The problem is caused by an internal TS7700 code component not working as intended resulting in the component to enter a hang state.
A TS7700 cluster in such SBND state is no longer properly responsive and requires a reboot to be initiated by an SSR through local intervention.
The issue is therefore impacting any TS7700 operation such as access to the Management Interface (MI), host job processing, copy jobs and the like.
The problem is not fully understood at this time as the development team continues to investigate.
Any pending code update to R5.3 GA (8.53.0.63) or R5.3 PGA1 (8.53.1.21) should be deferred until a workaround or fix is available.
Recommended Action
As an intermediate remediation an updated version of vtd_exec.103, preliminary v1.99, will be provided.
This updated version adds a temporary remediation for the issue as well as adding additional data capture in case of problem occurrence to allow development to better understand specific root cause.
The remediation is made up of a ‘watchdog’ mechanism that will detect the issue when it occurs and perform a restart of the internal component. Customer operations are not affected.
The remediation is made up of a ‘watchdog’ mechanism that will detect the issue when it occurs and perform a restart of the internal component. Customer operations are not affected.
The updated vtd_exec.103 is expected to be made available by end of day on Thursday 12 October 2023. The application of this vtd_exec is concurrent.
Date first published
10 October 2023
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Document Information
Modified date:
11 October 2023
UID
ibm17049717