Write the same data to two drives simultaneously? ...
It wasn't the intent :-), but you can do this with amanda-2.4.3 (now in
beta) or amanda-242-tapeio (from CVS) by using the rait output driver
and defining two drives. The first drive will contain the real data
and the last (second) drive contains the checksum (exclusive or).
But since there is only one drive, the checksum is identical to the data.
I think. You should test it.
Filling the tape might be
an issue, but I guess if you hit EOM on either drive you could restart the
current image on both.
That's what will happen with the above code.
Leaving level 0s on the holding disk after a write so that something like
amflush could make another tape of it?
I re-posted some changes recently that hook the unlinking of images from
the holding disk. It was meant to do all images, but could be changed
to do only level 0's.
Some of my backups are across a WAN and take several hours, dragging the data
across twice seems like a gross inefficiency. ...
If you have enough holding disk space, you could set reserve to allow
full dumps and set tapedev to /no/such/device to force amdump to
run but leave everything in the holding disk. Then some clever hard
linking (to prevent removal) and multiple amflush runs should be able
to accomplish what you want.
Frank
John R. Jackson, Technical Software Specialist, [EMAIL PROTECTED]
