Patent ID: 9552370
Date: 2017-01-24
CPC Classifications: G06F

Claim:
1. A method of informing a host system that a filesystem storing a plurality of virtual tapes is filled relative to a particular free space threshold, the method comprising: writing data to the filesystem responsive to a write request from the host system, the writing causing the filesystem to be filled above the free space threshold, the free space threshold being less than a maximum capacity of the file system; returning to the host system, responsive to the write request from the host system to a virtual tape stored by the filesystem, a message indicating that the filesystem has limited free space relative to the particular free space threshold; monitoring a plurality of filesystems, each filesystem storing a plurality of virtual tapes, for free space remaining on each of the plurality of filesystems; indicating, in a data structure stored in a memory, a particular filesystem that is filled above the particular threshold; and mounting, responsive to a request to mount a particular virtual tape that is on a filesystem indicated in the data structure as being above the particular threshold, the particular virtual tape as read-only.