Some parameters of the archive pipeline may need to be tuned for a better
efficiency and reliability:
The sleep_time card in each daemon parfile, which sets the
number of seconds the daemon sleeps between active loops. Something around
15 minutes sounds reasonable.
The size_limit and num_limit card in each archiver
daemon parfile, which respectively set the size and the number of files
beyond which on archiver has to save them to its medium. The size_limit
card sets also the maximum size of the set to be saved. Obviously, the
values of these cards must be low enough so that not too many files
are kept on disk and high enough so that the media is not accessed too often
(and a save set is not too small for media like tapes). A size_limit
of a couple of hundred megabytes and a num_limit of about one
hundred sounds sensible in the present configuration.
The disk_limit card in copyd.par which sets how much
space available there must be on the Waimea archive disk for copyd
to continue copying files down. It is important to avoid filling up
the Waimea disk because as it stands, the Exabyte archivers need to
restore the full set after saving for comparison purpose. Hence if we have
two Exabyte archivers each saving 200 Mb at a time, we need to have
disk_limit of at least 400 Mb.
WARNING If you modify size_limit, you may need to update the
maximum number of sets allowed per media in some media handlers (see
4.3.2).
