IBM DS8870 Architecture and Implementation

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Resiliency improvements

This appendix discusses resiliency improvements supported on the IBM DS8870 with DS8000 Licensed Machine Code (LMC) 7.7.10.xx.xx or later.

The resiliency improvements include the following features:

•Small Computer System Interface (SCSI) reserves detection and removal

•Querying count key data (CKD) path groups

•IBM z/OS Soft Fence

B.1 SCSI reserves detection and removal

Assume that two hosts share a disk or logical unit number (LUN). Obviously, the potential issue is that both hosts write data to the LUN at the same time, ...

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