[SOLVED] Deecting luns - Any explaination for the command
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The /sys folder in Linux is special in that the files in the structure are intended to provide an interface with the Linux kernel directly.
As such, when you are writing "- - -" to the /sys/class/scsi_host/host1/scan special file, you are sending a request to the Linux kernel to scan the scsi connections on the scsi bus "host1"
Each SCSI controller can have a number of buses, each bus can serve a number of devices, and each device can have one or more Logical Units.
The dashes act as wildcards. "- - -" simply means "scan all buses, all devices and all LUNs". The string "0 - -" would mean "scan all devices and LUNs on bus 0", while "- - 0" would mean "scan LUN 0 on all devices on all buses".
If you try to reference a non-existent bus/device/LUN, echo will return "write error: Invalid argument".
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