Timo Neuvonen wrote:
I was wondering if someone could give a quick run down of the advantages/disadvantages of spooling the data to disk before writing it to tape, and the advantages/disadvantages of NOT spooling.At least, spooling should guarantee that your tape drive is able to run at full speed continuosly. If for some reason your system isn't able to supply data to the tape drive at fast enough rate, the drive keeps stopping-repositioning-writing-stopping again, which then takes extra time and causes extra wear to the drive and the tape.
How sure are you that it continuously writes to tape. On my setup I put a max spooling size of 10 Gigs, and everytime it reaches the 10 gigs, the spooling seems to stop. Bacula seems to empty the spool by writing it to tape. Once the spool has been emptied, the backup process (the transfering over the network the data) continues again until the spool reaches once again 10G.
In my case I'm not sure I have the best setup possible for speed. Also, if you need to
manually change tapes during the backup, the data can be spooled nonstop, resulting in more consistent set of files (no time gap due to waiting for the tape change, that could take for hours sometimes) On the negative side of spooling, you'll need a disk volume big enough where to spool, and a slightly more complicated configuration. -- TiN ------------------------------------------------------------------------- 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 Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
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