Soft Fence and SPID Fence are volume protection functions provided by IBM® that are used for disaster recovery operations. The Query Host Access (QHA) function provides information about DASD and storage control units on IBM® z/OS®. For details about the Soft Fence, SPID Fence, and Query Host Access host functions and related host commands, see the IBM® documentation.
- Soft Fence
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Soft Fence is defined and canceled from the mainframe host. When you set Soft Fence to pair volumes created by using PPRC commands, the Soft Fence setting prevents unintended access to protect volumes that are needed to recover from a disaster. A volume for which Soft Fence is defined rejects host read/write requests as well as pair operations from the following software products:
- TrueCopy for Mainframe
- ShadowImage for Mainframe
- Universal Replicator for Mainframe
- IBM® FlashCopy®
- IBM® XRC
- Volume Migration
If you want to check the Soft Fence status, contact customer support.
Note: If a host cannot access a volume for which the Soft Fence setting is enabled, you can forcibly disable the Soft Fence setting on the volume from the mainframe host. If you want to forcibly disable the Soft Fence status on the volume from the storage system, contact customer support. You can forcibly disable the Soft Fence setting only when the host cannot access the volume. For instructions on disabling the Soft Fence setting from the host, see the IBM® documentation. - SPID Fence
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SPID Fence is defined and canceled from the mainframe host. When you set SPID Fence to a volume, the VARY ONLINE host command is rejected so that the volume is not allowed to be online.
If you want to check the SPID Fence status, contact customer support.
Note: If a host cannot access a volume for which the SPID Fence setting is enabled, you can forcibly disable the SPID Fence setting on the volume from the mainframe host. If you want to forcibly disable the SPID Fence status on the volume from the storage system, contact customer support. You can forcibly disable the SPID Fence setting only when the host cannot access the volume. For instructions on disabling the SPID Fence setting from the host, see the IBM® documentation. - Query Host Access
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The Query Host Access function enables you to display the host access information for a volume when you execute the DEVSERV command with the QHA parameter from the mainframe host.