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Thread: New install of 2.6.0p2 - slow speed during backup

  1. #1

    Default New install of 2.6.0p2 - slow speed during backup

    Hello,

    I am just doing some testing on using amanda as my backup software. The question is, what options in amanda.conf effect the speed of backup?

    Env:

    backupserver (192.168.1.250) - Linux - CentOS 5.2 - 100MB/FD
    linux (192.168.1.4) - Linux - CentOS 5.2 - 100MB/FD

    Backup - dump /storage/amanda/dump (~ 500 GB) - USB Drive
    Backup - vtapes /storage/amanda/vtapes (~ 2.7 TB) - 4 USB Drives (RAID 5)

    linux:/opt/share/data is approximately 33G

    from the dump log:
    amdump: start at Sun Dec 14 23:03:25 EST 2008
    amdump: end at Mon Dec 15 06:30:12 EST 2008

    6+ hours to backup 33g? In the email it says 1307.5 kb/s was the transfer rate. Both machines are 100MB/FD, and according to iperf -- a nice clean connection:

    linux# iperf -c backupserver
    ------------------------------------------------------------
    Client connecting to backupserver, TCP port 5001
    TCP window size: 16.0 KByte (default)
    ------------------------------------------------------------
    [ 3] local 192.168.1.4 port 59243 connected with 192.168.1.250 port 5001
    [ ID] Interval Transfer Bandwidth
    [ 3] 0.0-10.1 sec 115 MBytes 95.6 Mbits/sec

    Any suggestions would be greatly appreciated.

  2. #2
    Join Date
    Mar 2007
    Location
    Chicago, IL
    Posts
    688

    Default

    Amanda can only move as quickly as its slowest part, especially with only one DLE (so it cannot exploit any kind of parallelism). In most cases, the slowest link is the dump process -- gnutar has to run through the filesystem, statting each file, and so on. Take a look at how fast that operation is going..

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