On Thu, 26 Aug 2010 07:51:56 -0400 (EDT), Steve Thompson <s...@vgersoft.com> wrote: > On Thu, 26 Aug 2010, m...@free-minds.net wrote: > >> 1) do we really need to spool? We are not writing to real tapes, we have >> a >> filesystem as backend (ext3 over glusterfs). > > I am one of those that believes spooling to be useful even when writing > backups to disk; it is obviously not in question that it's good when > writing to tape. I see the advantages as having the backup volumes less > fragmented than when writing directly without a spool, especially when > running many concurrent job, and this increases restoration performance.
mh afaik we are running only one job per tape > In some scenarios, the spool may be faster anyway; for example, at home I > spool jobs to a collection of SCSI drives with the pools situated on a set > of ATA and USB drives (and btw, USB drives are sooooooo slow). we are writing over 100MBit Network to another server, so we can just write with max arround 4MB/s my problem with spooling is that we need x hours to spool and nearly the same time to despool. The despool process is only a few minutes faster. So the transfer rate for spooling is quite the same than to the storage. So i think spooling is here not really a performance boost? on the other hand we have a FTP Backup Storage, where we use 100MB Tape files, spooling here is much faster, because he can put the tape file completly on the storage... > > Steve > ------------------------------------------------------------------------------ Sell apps to millions through the Intel(R) Atom(Tm) Developer Program Be part of this innovative community and reach millions of netbook users worldwide. Take advantage of special opportunities to increase revenue and speed time-to-market. Join now, and jumpstart your future. http://p.sf.net/sfu/intel-atom-d2d _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
