Working with FCP devices

7.1 LPAR mode z/VM guest

Set an FCP device online before you attempt to perform any other tasks.

Setting an FCP device online or offline
In traditional LPAR mode FCP devices are offline by default. Set an FCP device online before you perform any other tasks.
Displaying FCP channel and device information
For each online FCP device, a number of sysfs attributes provide information about the corresponding FCP channel and FCP device.
Recovering a failed FCP device
Failed FCP devices are automatically recovered by the zfcp device driver. You can read the in_recovery attribute to check whether recovery is under way.
Obtaining diagnostic data for FCP channels
Diagnostic data about FCP channels is available as of z14 and FICON® Express8S.
Finding out whether NPIV is in use
The FCP setup runs in NPIV mode if the port_type attribute of the FCP device attribute contains the string "NPIV". Alternatively, if the applicable permanent_port_name and port_name are not the same and are not NULL.
Logging I/O subchannel status information
When severe errors occur for an FCP device, the FCP device driver triggers a set of log entries with I/O subchannel status information.

Parent topic: SCSI-over-Fibre Channel device driver