Item 1: flush spooled data based on free percentage
Origin: Mark Bergman <[EMAIL PROTECTED]>
Date: Wed Aug 23 11:44:28 EDT 2006
Status:
What: add directive to flush spooled data on the basis of free space
remaining on the spool volume
Why: Spooling data to disk can make backups more efficient. The larger the
spool file, the greater the potential gains. While there are directives
to limit the spool file sizes (individually and collectively), disk
space usage is often dynamic, particularly if the spool directory
isn't on a disk volume dedicate to spooling. By setting a threshold
of free space remaining on disk as a trigger to flush spool files to
the storage volume, spooling can be more efficient. Currently, the spool
partition can run out of space even if the "Maximum Spool Size" and
"Maximum Job Spool Size" limits are not reached.
In addition, the current directives are based on per-storage
device limits. If there are multiple storage devices using the same
spool device, the only safe scenario is to assign a "Maximum Spool Size"
that is the available space divided by the number of devices. This would
ensure that simultaneous jobs destined for different devices won't run
out of spool space, but it's much less efficient if the jobs aren't
going to all the storage devices.
For example:
available spool space: 100GB
number of storage devices: 4
recommended "Maximum Spool Size" in each Device definition: 25GB
however, if jobs are using just one storage device, they will still
be limited to 25GB of spooled files, rather than being able to make use
of the 100GB of spool space.
I suggest adding a directive "Minimum Free Percentage"
which has precendence over the other spool file size directives, and
which would allow jobs going to any device to continue spooling
(subject to the other limits, if set) until the specified amount of
disk space remains. For example, if the directive in bacula-sd.conf
read:
Device {
Minimum Free Percentage = 10
...
}
then in the above scenario, jobs destined for any of the 4 devices
would continue spooling as long as there was at least 10% of the spool
partition free (and subject to the other limits, if any were set).
In the event that the Minimum Free Percentage is reached, spooling would
be stopped, and the largest spool file would be flushed to the storage
device.
It would be considered a syntax error if multiple Device{} definitions
that were using the same spool directory set the "Minimum Free
Percentage" directive to different values.
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