Hi, On 3/25/2007 5:39 PM, Marc Cuypers wrote: > Hi Arno, > > Thanks for answering. > > Arno Lehmann wrote: >> 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. > > When running concurrent jobs, each job will have its own spool file in > the spooling directory? And normally when a spool file fills for one > job, writing to tape can begin, while the other jobs keep spooling?
Alan answered this already, so I just add my comment because you addressed me :-) Yes and yes. Arno > -- > Best regards, > > marc > > Questionable day. > > Ask somebody something. > > ------------------------------------------------------------------------- > 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 -- 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
