mt rel and res

[j773303]

What does the mean of the mt command rel and res?
Reserve tape drive for sole use by the host issuing the
mt command (stape driver only).

rel Release tape drive from sole use by the host issuing
the mt command (stape driver only).

[Massimo Bianchi]

They are used to issue the scsi command reserve and release.


If your tape are directly attached to the host, they are of little use.

But if you have the same tape connected to multiple hosts, like in a MUX, this command prevents other hosts from using a device already held by another hosts.

In a SAN it's diffent, usually you don't use scsi reserve and release command but you let the device being logically lock, ex by OB software.


HTH,
Massimo