The FCP adapter can only open a limited number of SCSI devices. This limit
has been reached and the SCSI device at the indicated LUN cannot be opened.
User response
For FCP subchannels running in non-NPIV mode, check all SCSI
devices opened through the FCP adapter and close some of them. For
FCP subchannels running in NPIV mode, verify the SAN zoning and
host connections on the storage systems. Ensure that the zoning and
host connections only allow access to the required LUNs. As a
workaround, disable the automatic LUN scanning by setting the
zfcp.allow_lun_scan kernel parameter or the allow_lun_scan module
parameter to 0.