On Tuesday, 30 July 2024, at 7:29 AM, Marco Feichtinger wrote:
> So I am curious how does it work, 
how does one to set it up, so the arenas get mirrored automatically,
and why do you use it instead of fs(3) mirror?

Adding to this ill-fated thread. Mirroring venti arenas was just a stillborn 
idea. 

The basic idea of venti arenas was to  copy them to ROM devices as soon as the 
arena would not change anymore., ie. it is sealed. After this event there is no 
need to mirror anything. For sealed arenas , making copies available for 
recovering  from disastrous disk failures is a trivial exercise.

Of course, if you want to recover instantaniously from a failure in a 
non-sealed   not-backuped arena, there might be a desire for such a mirror. 
Nobody cares about such events, alas.

The main problem for the instantaneous availability of the backup is not the 
arena mirror, but the index file. I doubt that mirrorarenas was ever designed 
to be used for this purpose.
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