James Harper wrote: > I'd hazard a guess that for spooling, raw throughput is more important > than random access seek time, unless you spool is fragmented.
You arte correct - IF you're only spooling one backup. I may have anything up to 6 running simultaneously, some people on this list have much larger installations than mine. As soon as you have more than one backup running there will be head seeks. On a 4 spindle RAID-0 array, I found that aggregate throughput dropped more than 50% when spooling 2 100Gb files and unspooling 2 the same size. Even just spooling one file while unspooling another had an aggregate performance hit of 25%. On top of that the drives themselves tend to die quickly due to mechanical stress. You won't see any of this if you're just spooling a single job, but in a largish installation with multiple tape drives and tens of terabytes of data, you _have_ to run simultaneous backups or you quite simply can't keep up. AB ------------------------------------------------------------------------------ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
