Library /sys$common/syshlp/sysmanhelp.hlb DISKQUOTA, ADD, Qualifiers, /DEVICE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /DEVICE=device-spec

    Specifies the location of the quota file. SYSMAN validates the
    device specification. You can specify a logical name for device-
    spec. If you do, the logical name is translated in the target
    environment.

    Without a device specification, SYSMAN uses the default disk
    on the target node. Unless you have set a default device with
    the SET PROFILE command, the default disk is the current device
    on the local node or the login default device on another node,
    depending on the established environment.