ekke85 wrote (2010/08/05): > slow. It writes at 22mb/sec. The drives should be able to do a lot more > then that. I have to backup 11TB that takes a couple of days to
Try tar -cf /dev/null /data-with-11-tb and you will see, if the bottleneck is data source, or something else. How many files do you have here? > The spooling attribute was not enabled, I have enabled it now. Yes, attribute spoolig is good thing too. However, data spooling is more important, as i said before. > ]# dd if=/dev/zero of=/home/bigfile bs=1M count=10000 > 10000+0 records in > 10000+0 records out > 10485760000 bytes (10 GB) copied, 189.551 seconds, 55.3 MB/s Very slow. My spooling system says 372 MB/s, which is for spooling 4 parallel backups and one writing thread to LTO-3 tape. With 55 MB/s, you can do at most one backup at a time, and the tape is still "undernourished" (if write speed would equal to read speed).. > This is writing that 10gb file with tar to tape: > ]# time tar -czf /dev/Drive1 /home/bigfile > tar: Removing leading `/' from member names No, it was not tar, but a gzipped tar, where source was just zeros... I expect, that you wrote on the tape just about 10 MB and you could not say, what you tested more: Reading speed, processor speed, or tape write speed. > The 11Tb I have to backup is on a NetApp, the NetApp is mounted via > NFS on the backup host and is getting the data from there to write to disk. Which role NetApp plays here? NFS is not very good ticket to the speed... -- Rudolf Cejka <cejkar at fit.vutbr.cz> http://www.fit.vutbr.cz/~cejkar Brno University of Technology, Faculty of Information Technology Bozetechova 2, 612 66 Brno, Czech Republic ------------------------------------------------------------------------------ The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
