Bacula-users

[Bacula-users] Excruciatingly slow backup to Tape - local and remote

2012-12-17 18:50:56
Subject: [Bacula-users] Excruciatingly slow backup to Tape - local and remote
From: shockwavecs <bacula-forum AT backupcentral DOT com>
To: bacula-users AT lists.sourceforge DOT net
Date: Mon, 17 Dec 2012 15:47:48 -0800
I'm only seeing around 2MB/s write speed to tape. I have read all about 
spooling the data, etc. I would expect this to be an issue if I was complaining 
about getting 18-25 MB/s instead of 90-100MB/s maybe? Anyways, I simply cannot 
understand why a single job runs at 2 MB/s and 3 jobs will run about 2.5MB/s 
total. See output below (all servers in the same rack/switch running at the 
same time):

Writing: Full Backup job MSSERVER2 JobId=24 Volume="BAL_01"
    pool="Default" device="AIT-4" (/dev/nst0)
    spooling=0 despooling=0 despool_wait=0
    Files=18,121 Bytes=9,726,633,719 Bytes/sec=1,008,254
    FDReadSeqNo=305,615 in_msg=251883 out_msg=5 fd=6

Writing: Full Backup job TS JobId=25 Volume="BAL_01"
    pool="Default" device="AIT-4" (/dev/nst0)
    spooling=0 despooling=0 despool_wait=0
    Files=20,896 Bytes=5,088,180,026 Bytes/sec=691,234
    FDReadSeqNo=256,355 in_msg=195224 out_msg=5 fd=8

Writing: Full Backup job BALDC1 JobId=26 Volume="BAL_01"
    pool="Default" device="AIT-4" (/dev/nst0)
    spooling=0 despooling=0 despool_wait=0
    Files=39,608 Bytes=4,514,041,685 Bytes/sec=658,503
    FDReadSeqNo=411,027 in_msg=295248 out_msg=5 fd=10



Here is the output of backing up the bacula server itself (this proves spooling 
would not help me, right?):


  Build OS:               i686-pc-linux-gnu redhat 
  JobId:                  12
  Backup Level:           Full (upgraded from Incremental)
  Client:                 "bacula-fd" 5.2.6 (21Feb12) i686-pc-linux-gnu,redhat,
  FileSet:                "Full Set" 2012-12-17 11:24:20
  Pool:                   "Default" (From Job resource)
  Catalog:                "MyCatalog" (From Client resource)
  Storage:                "SONY" (From command line)
  Scheduled time:         17-Dec-2012 11:24:18
  Start time:             17-Dec-2012 11:24:22
  End time:               17-Dec-2012 12:34:46
  Elapsed time:           1 hour 10 mins 24 secs
  Priority:               10
  FD Files Written:       118,347
  SD Files Written:       118,347
  FD Bytes Written:       8,199,458,340 (8.199 GB)
  SD Bytes Written:       8,215,432,405 (8.215 GB)
  Rate:                   1941.2 KB/s
  Software Compression:   None
  VSS:                    no
  Encryption:             no
  Accurate:               no
  Volume name(s):         BAL_01
  Volume Session Id:      1
  Volume Session Time:    1355761332
  Last Volume Bytes:      8,225,667,072 (8.225 GB)
  Non-fatal FD errors:    0
  SD Errors:              0
  FD termination status:  OK
  SD termination status:  OK
  Termination:            Backup OK
 Begin pruning Jobs older than 6 months .
 No Jobs found to prune.
 Begin pruning Files.
 No Files found to prune.
 End auto prune.

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