Bacula is transferring data at a fraction of the available link speed. I am backing up an SMB share hosted on a fast NAS appliance. The share is mounted on the bacula server in /mnt/NAS/sharename. I have dedicated 10gbe copper interfaces on the NAS and the bacula server.
When backing up the NAS, cifsiostat shows around 250MB/s during the spooling phase (and 0 kb/s during the despool phase). When using cp to copy files from the NAS to the Bacula server, I can easily saturate my 10gbe link (avg throughput around 1GB/s, or a little lower). I think the problem lies in Bacula because I can copy data much faster using cp instead of bacula. Obviously bacula is doing a lot more than cp, so there will be differences. However I would hope for transfer speeds closer to the available link speed. top shows that a couple cores are maxed out during the spooling process. Maybe hashing speed is the limitation here? If so, could multicore hashing support speed this up? I have two e5-2676 v3 processors in this server. I am using SHA512 right now, but I saw similar speeds from bacula when using MD5. Average write speed to LTO-8 media winds up being about 120-150MB/s once the times to spool and despool are considered. My spool is on a 76GB ramdisk (spool size is 75G in bacula dir conf), so I don't think spool disk access speed is a factor. I have not tested to see if bacula could back up faster if it wasn't accessing a share via SMB. I don't think SMB should be an issue here but I have to consider every possibility. The SMB share I'm backing up is mounted on /mnt/NAS/sharename. Bacula is backing that mount folder up. Currently, my only access to the NAS appliance is via SMB. The appliance does support iscsi in read only mode but i'm not sure if there would be any performance improvements. I don't think the traffic could be going out through the wrong interface. The NAS is directly attached to my bacula server using a short cat6 cable. The NAS and my server each have 10gbe copper interfaces. The relevant interfaces have ip addresses statically assigned. These addresses are unique to the LAN configuration (local lan is 10.1.1.0/24, 10gbe interfaces assigned to 192.168.6.25 and 192.168.6.100). My bacula server's only other connection is to the gigabit LAN switch. Is there any information that I could provide to help the list help me, or does anyone have any thoughts for me? Regards, Robert Gerber 402-237-8692 r...@craeon.net
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