Control switch settings
Use the control switch settings worksheet to specify certain settings that affect host connectivity. You are asked to enter these choices on the control switch settings worksheet so that your technical service representative can set them during the installation of your storage system.
The following control switches are set using the choices you specify on the control settings worksheet.
IBM i LUN serial suffix number
Use this control switch setting only when you attach more than one DS8000® storage system to an AS/400 or IBM® i host and the last three digits of the worldwide node name (WWNN) are the same on any of the storage systems.
Control switch settings - attachment to IBM Z
The following control switch settings are specific to IBM Z .
- Control-unit initiated reconfiguration (CUIR) support
- Control-unit initiated reconfiguration (CUIR) allows automation of channel path quiesce and resume actions during certain service actions. This setting eliminates the requirement for manual actions from the host.
- Control unit threshold
- This control switch provides the threshold level, presenting a SIM to the operator console for controller related errors. SIMs are always sent to the attached IBM Z hosts for logging to the Error Recording Data Set (ERDS). SIMs can be selectively reported to the IBM Z host operator console, as determined by SIM type and SIM severity.
- Device threshold
- This control switch provides the threshold level, presenting a SIM to the operator console for device related errors. Device threshold levels are the same type and severity as control unit threshold settings.
- Lights-on fast load for host adapters
- Fibre Channel lights-on fast load provides seamless microcode update to storage arrays, and eliminates potential loss of access.
- Media threshold
- This control switch provides the threshold level, presenting a SIM to the operator console for media related errors. Media threshold levels are the same type and severity as control unit threshold settings.
- Present SIM data to all hosts
- Service Information Messages (SIMs) are offloaded to the first I/O request directed to each logical subsystem in the storage facility if the request is device or control unit related, or offloaded to the individual logical volume when the request is media related. This control switch determines whether SIMs are sent to all, or to only the first, attached IBM Z LPAR making an I/O request to the logical system or logical volume.
- IBM Z high-performance FICON enhanced buffer management
- IBM Z high-performance FICON enhanced buffer management provides improved performance for multi-site configurations when writing data remotely (remote site recovery).