On 12/19/2014 05:28 PM, Jon LaBadie wrote:
On Fri, Dec 19, 2014 at 03:20:09PM -0500, Jean-Louis Martineau wrote:
On 12/19/2014 02:39 PM, Jon LaBadie wrote:
Following and researching Debra Baddorf's thread raised some questions
in my mind. In one posting, JLM said:
On Wed, Dec 17, 2014 at 01:16:32PM -0500, Jean-Louis Martineau wrote:
...
It autoflush is set, they should be flushed first.
All flush are done in increasing dumptime order.
1. With autoflush set, are flushing old dumps and taping new dumps
done in separate "phases", say flush and taper?
no, at the beginning, all flush are added to the tape queue, like new dump
once on holding disk.
That flushing
ignores the taperalgo setting would imply this. Does flushing
follow date/time order while taper follows taperalgo?
date order first, then taperflush for those with the same date.
If new
dumps are available before flushing old dumps is completed, are
the new dumps ignored til the taper phase?
nothing is ignored, they are put in the tape queue, and flushed in date
order.
Thanks. Do you mean date only, or date/time order? I'm guessing date
only otherwise taperalgo would have little or no effect.
The timestampt of the backupo run, all dump done in the same run have
the same timestamp.
If date only, that could have implications for Debra's scheme. After
the main dumps are completed, she wishes to do additional dumps meant
to go at the beginning of the "next day's tape". The dumps left on
on the holding disk could have the same date as the first new dumps
added to the holding disk.
2. Starting a new tape during the taper phase is affected by the
two "flush-threshold-*" settings. With autoflush set, are the
flush-threshold-* settings ignored?
yes
Sorry, the answer is NO.
I.e. is a new tape started
regardless of the amount of old dump data on the holding disk?
no
I thought these were the same question asked different ways.
Why the different answers?
4. The amanda.conf(5) description of the two parameters contain
this wording:
flush-threshold-dumped:
The value of this parameter may not exceed than that of the
flush-threshold-scheduled parameter.
flush-threshold-scheduled:
The value of this parameter may not be less than that of the
flush-threshold-dumped ... parameters.
Only an equal value for both parameters meets these requirements.
Is there an error in the description? If not, why two separate
parameters?
I read it as: flush-threshold-dumped <= flush-threshold-scheduled
flush-threshold-dumped count only the dumps already on holding disk
flush-threshold-scheduled count the dumps already on holding disk + the
scheduled dump
Setting flush-threshold-scheduled < flush-threshold-dumped is the same as
setting it to 0 (not use)
My bad, of course f-t-s could be larger than f-t-d. You might want to
start a new tape if 50% of a tape is already dumped, or if already dumped
plus scheduled to be dumped is 80% of a tape.
Jon
