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IBM DS8870 Architecture and Implementation by Bertrand Dufrasne, Artur Borowicz, Sherri Brunson, Stephen Manthorpe, Don Skilton, Warren Stanley

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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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