> I am doing some tests about spooling. I have created a spool filesystem for > testing purposes. I decided to try a quiet small one - just 10 GB. Well, I > get an ugly perfomance (<10MB/s) with this one. So I assume that the spool > file system is too small - is this assumption right? >
Remember that a job will not despool when it spools so that this will not be as efficient as possible unless you run more than 1 job at a time or have a spool size larger than your largest job. Since I use concurrency I use a 5 or 10GB spool file like I have been doing for over 5 years out of the 8+ years I have used bacula. On my LTO2 archive I regularly see despool rates of 20 to 60 MB/s to a single LTO2 tape drive all the time however backup rates are highly dependent of what type of backup and the percentage of small files. Incrementals will show low rates because a large percentage of the time of the backup is spent searching for the few files to backup instead of actually doing the backup. A full will generally have a way higher backup rate because all files are selected instead of spending time searching. However with this said Incrementals are generally much faster than fulls even though they show a much lower rate. On top of this source filesystem performance and database performance are very important. Also make sure you are not using software compression if you have a tape drive. Software compression even on the fastest i7 with an SSD will most likely be less than 10MB/s while tape drive HW compression can easily achieve 10 times that rate. John ------------------------------------------------------------------------------ Special Offer -- Download ArcSight Logger for FREE! Finally, a world-class log management solution at an even better price-free! And you'll get a free "Love Thy Logs" t-shirt when you download Logger. Secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsisghtdev2dev _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
