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Recommended Upgrade for SVC, V7000 and V5000 Systems Running v7.4.0.9, v7.5.0.7, v7.6.0.4, v7.6.1.1 or v7.6.1.3

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Abstract

An issue has been found which can cause a self-recovering node warmstart. In rare cases, a warmstart can occur on both nodes in an I/O group, leading to a temporary interruption in volume access.

This issue (APAR IT14917) is present in the v7.4.0.9, v7.5.0.7, v7.6.0.4, v7.6.1.1 and v7.6.1.3 PTFs. Earlier PTFs on these code streams are not affected.

Content

This issue is caused by a defect related to a small timing window during the transition from a volume's cache being empty, to the cache being non-empty. Volumes which have a bursty I/O workload, where there are frequent idle periods followed by a burst of I/O, are therefore more likely to experience this issue.

This issue is fixed in the v7.4.0.10, v7.5.0.8 and v7.6.1.4 PTF releases.

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Document Information

Modified date:
28 March 2023

UID

ssg1S1005863

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