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IBM DS8870 Architecture and Implementation by Maged Sallam, Stephen Manthorpe, Jean Francois Lepine, Jeff Cook, Juan Brandenburg, Bertrand Dufrasne

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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 ...

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