Hi, On 3/24/2007 9:16 PM, Marc Cuypers wrote: > Hi, > > I'm still using bacula 1.38.5. > > To prevent shoe shining (writing, rewinding, writing again) with a tape > drive bacula uses spooling. ... > The spooling to the file and the writing to tape is not concurrent. Is > there a reason for this?
Yes, but what it boils down to is that noone implemented a buffering scheme like using a circular buffer and filling and emptying it simultaneously. Note that many hard disk systems have already difficulties delivering data fast enough to allow streaming on todays tape drives. That would get worse if, due to concurrent writes and reads to one disk, access times increased. > Has this changed in later versions? No, not as far as I know. > Are there > any changes to be expected in this? I doubt it. > I'm asking this because backups without spooling are faster than those > with spooling. Is this normal? It can be normal, and in most cases is. Overall throughput will probably increase when you run multiple concurrent jobs. Arno -- IT-Service Lehmann [EMAIL PROTECTED] Arno Lehmann http://www.its-lehmann.de ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Bacula-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/bacula-users
