Il giorno 03/mar/2011, alle ore 17.58, Alan Brown ha scritto:

> John Drescher wrote:
> 
>> I made a try with this results
>>> 
>>> JobId 7: Spooling data ...
>>> JobId 7: Job write elapsed time = 00:13:07, Transfer rate = 1.295 M 
>>> Bytes/second
>>> JobId 7: Committing spooled data to Volume "FullVolume-0004". Despooling 
>>> 1,021,072,888 bytes ...
>>> JobId 7: Despooling elapsed time = 00:02:19, Transfer rate = 7.345 M 
>>> Bytes/second
>>> JobId 7: Sending spooled attrs to the Director. Despooling 6,816,214 bytes 
>>> ...
>>> 
>>> There is only a little improvement of performances.
> 
> Spooling or not spooling is very much a case of "it depends".
> 
> There is little point in using spooling if the destination device is a disk 
> drive and you are not using concurrent jobs.(*)
> 
> For a NFS mounted destination network delays are your biggest problem.

Thank you for your analysis, after that I think that the problem is not the nfs 
overhead, because the despooling phase (over nfs filsystem) has a transfer rate 
of 7.3 MBps, so it's fine. Instead the first phase (bacula-fd -> bacula-sd) 
happens at 1.2 MBps which is very poor value I think.

So the bottleneck should be the client configuration or something similar. What 
I should check to improve performances?

This is the fileset used for that backup

FileSet {
  Name = "FileSystem Full"
  Include {
    Options {
      compression=GZIP # compress backup
      signature = MD5  # store md5 of saved files
      onefs = no       # remember to exclude nfs directory: default no
      accurate = mcs   # attributes to consider when examining changes
      verify = pins5   # attributes to consider when verifying files
      noatime = yes    # don't update file access time
    }
    # whole filesystem
    File = /
  }
  
  Exclude { 
    # use this syntax to exclude files coming from a client file
    # The given file MUST exist on the client otherwise backup will fail
    File = "\\</etc/bacula/exclusions"
  }
  
  Exclude {
    # Standard exclusion
    File = /var/lib/bacula
    File = /var/cache
    File = /var/spool
    File = /dev
    File = /proc
    File = /sys
    File = /mnt
    File = /tmp
    File = /nfs
    File = /.journal
    File = /.fsck
  }
}

and this is my job

JobDefs {
  Name = "Server Filesystem"
  Enabled = yes                    # remove when in production
  Accurate = no                    # handle deleted and moved files
  Type = Backup
  FileSet = "FileSystem Full"      # mandatory
  Schedule = FileSystemWeeklyCycle 
  Messages = Standard              # tuning dello standard oppure ridefinire
  Pool = Default                   # overwritten by following directives
  Full Backup Pool = FullPool                   # which pool uses for full 
backups
  Differential Backup Pool = DifferentialPool   # which pool uses for 
differential backups
  Incremental Backup Pool = IncrementalPool     # which pool uses for 
incremental backup
  Priority = 10
  Write Bootstrap = "/var/lib/bacula/%c.bsr" # optionally copy this file on 
other source when backup is done
  Spool Data = yes                 # avoid network congestion due to nfs writes
}

> (*) If you are using concurrent jobs and writing output to disk, spooling 
> will usually help maintain speeds, because writing multiple files to the 
> target disk will result in slowdowns due to head seeking. A single job 
> despooling is more akin to streaming throughput.

Ok, currently I haven't tried concurrent jobs, but I'll maintain spooling 
configuration when I'll do them.

--
Fabio Napoleoni - ZENIT
fabio AT zenit DOT org

"Computer Science is no more about computers than astronomy is
about telescopes"

                                                    Edsger W. Dijkstra


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