Ralf Gross schrieb: > Chris Howells schrieb: > > > After spooling bacula is writing to LTO with 70Mb/s here. > > > > > > 02-Sep 06:47 VU0EM005-sd: Despooling elapsed time = 01:43:59, Transfer > > > rate = 72.28 M bytes/second > > > > > > This is with the default block size and only one single job. > > > > Is that LTO 4? What model tape drive? > > It's an IBM Ultrium-TD3 drive (LTO-3, sorry for skipping that info), > NEC-T40A 40x changer. > > > That's bizarre. What HBA are you using? Would also be interesting to > > know what OS. I've got a Symbios Logic SAS1068 PCI-X Fusion-MPT SAS on > > Ubuntu 6.10. Kernel 2.6.15, which I guess is rather old now. > > SCSI storage controller: Adaptec AIC-7901 U320 (rev 10) > Debian Etch/4.0 amd64 > > The transferrate depends on the type of backup and if spooling was > used.
Update: With dd and different block sizes I get 100-115 MB/s (bs=64k to 256k). This was only a simple test with the new LTO-4 drive. Changing the bs to more than 128 didn't result in better performance. A simple test with tar was much slower (~60 MB/s, didn't touch the bs). I didn't test bacula with other bs than the default, but I get ~77 MB/s for a backup of a file on the sd (fd/sd on the same server) where the LTO-4 drive is connected to (Attribute Spooling enabled, just one 20 GB file). I'm not sure why backup to LTO-4 isn't faster than the backup to LTO-4, but the result is not that bad. Ralf ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Bacula-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/bacula-devel
