On 2/2/2011 10:19 AM, Bob Hetzel wrote: > On 2/2/2011 9:30 AM, Alan Brown wrote: >> >> Where can I find documentation on how Bacula chooses drives in a changer? >> >> It appears that right now it's always seeking to find an unoccupied unit >> numbering upwards from drive 0 every time, but that means that there is >> an uneven spread of wear and tear across the devices. >> >> Can anyone verify?
> Yup, that's exactly what it does here too. I guess one could think of the > extra backup usage wear as akin to the order of the starting lineup in a > baseball team. The guy batting first will, in the course of a whole > season, be at bat a lot more times than the guy last in the order. > > Another result is that the last job in a big schedule frequently wants to > run in drive 0 but using a tape that's already mounted in a different > drive. Fortunately, bacula 5.0.3 seems to be pretty good about unloading > the tape and re-loading it (with the timeout settings in place in the sd > config) but this is also extra wear and tear and probably has a much worse > effect. Post adjusted so it reads in order.... It's good to know the observation is repeatable. I have not looked at the code, but it should be fairly easy to adjust the getNextAvailableDrive() function (I made up that name). Suggestions for a would-be-coder: * let the config indicate a selection method: * random (get list of free drives && randomly select one of them) * user specified order: 1, 4, 2, 3 * default: use first available drive (current selection method) Anyone up for a mini-task? -- Dan Langille - http://langille.org/ ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Bacula-devel mailing list Bacula-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-devel
