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[Bacula-devel] Feature request: multiple media types per storage device


Item: Allow configuration of multiple media type capabilities per storage device

Date: 17 January 2008

Origin: Frank Sweetser <fs@xxxxxxx>

What: Extend the media type configuration for storage devices from a single
type to multiple types, including specifying that some are read-only.

Why: As various storage types evolve, a single media type per storage device
is no longer adequate.  For example, LTO-4 drives can read LTO-4, LTO-3, and
LTO-2 tapes, but can only write to LTO-4 and LTO-3.  Lack of this information
in a heterogeneous configuration could lead to failed backups if Bacula
selects a non-writable tape from a library for a backup job.  Also, the only
currently available workaround (lie to Bacula about the media type of some
volumes) means that it's often not possible to generate an accurate volume
inventory from the catalog.

Notes: One simple way to implement this might be redefine the current 'Media
Type' directive into a comma separated list, and add another 'Read Only Media
Type' directive which lists the media types that device is capable of reading
but not writing.  This should provide a backwards compatible way of extending
the media type configuration.

-- 
Frank Sweetser fs at wpi.edu  |  For every problem, there is a solution that
WPI Senior Network Engineer   |  is simple, elegant, and wrong. - HL Mencken
    GPG fingerprint = 6174 1257 129E 0D21 D8D4  E8A3 8E39 29E3 E2E8 8CEC

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