On 8/24/2017 10:49 AM, Dimitri Maziuk wrote:
On 2017-08-24 09:24, Josh Fisher wrote:
As for writing the same job to two disks simultaneously, I don't
think that will be very easy to accomplish. It would, I believe,
require a new Device type driver in Bacula that atomically reserves
two Device resources at a time. Why not use Copy jobs? Or pair the
removable drives into RAID1 arrays?
Amanda had RAIT option since forever: you just tell it to use 2 tape
devices.
It is very possible. I just think the devs feel it is very low priority
due to md raid.
Copy jobs aren't quite for that, and with, say, 2U 12-3.5" bay
chassis I'm looking at a spool ssd, 1 "copy" disk, and 10 "magazines"
-- or 5 raid=1 "magazines". It's certainly doable but I'll have to
swap the disks twice as often, that is less than perfect. I might
actually do it in the next iteration, but the truth is our hdds don't
fail that often so at this point it ain't really broken, just suboptimal.
I don't quite understand. It will take twice the disk space whether
using RAID1 or rsync. I can see why a Copy job may not be wanted, since
it would additionally increase the catalog size and use a different volume.
Someday I'll read up on fuse, too, I wonder how much trickery one can
program into that.
Dima
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