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Thread: Slow backup (1MiB/s) of local machine (large DLE)

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    Default Slow backup (1MiB/s) of local machine (large DLE)

    Ok, I am just starting w/ Amanda per my post here ([url]http://forums.zmanda.com/showthread.php?t=2227[/url]) I have some large systems that I want to have a backup system locally attached to them (due to their size). Locally I can back up to tape (LTO4) with GNU Tar (v1.19 / ubuntu 8.04.3) at ~105-110MiB/s no problems. The drive array consists of 64 drives on hardware raid controllers using LVM to stripe the various raid-6's. RAW I/O to the volume is over 500MiB/s.

    When using amanda with the configs below, I see that the estimate phase takes a very long time (fails to complete on /var/ftp) and from iostat seems to be doing only 1-2MiB/s? which could very well be a problem in that regard. When dump finally /does/ start on the disks the backup is about 1-2MiB/s (nearly 10 hours to back up less than 100GiB).

    I did notice that amanda does NOT set any blocking factor to tar, so I wrapped tar (created a script that would add the blocking factor of 1024 (512KiB) which I use for direct tar backups and gave me the >100MiB/s numbers above.

    Since this is so pathetic, I am hoping that there is something that someone can see here as I just can't believe that amanda or any backup utility could be this bad by design.

    I also noticed that all the taper 'PART' sections of the log mention 10240 kbp which may be a hard coded limit somewhere but can't find it or even if that is important (does seem very low though).

    EDIT: note, running 2.6.1p2 binary from zmanda.com for ubuntu 8.04

    On a test machine I have this:
    ---(df -h)
    Filesystem Size Used Avail Use% Mounted on
    /dev/sda3 58G 11G 44G 20% /
    /dev/sda1 236M 58M 167M 26% /boot
    /dev/mapper/vg_media-lv_ftpshare
    40T 29T 12T 72% /var/ftp
    /dev/mapper/vg_media-lv_usershare
    2.0T 1.4T 685G 67% /home
    ---- (disklist)
    xxxx / nocomp-tar
    xxxx /boot nocomp-tar
    xxxx /home nocomp-tar
    xxxx /var/ftp nocomp-tar

    ----(amanda.conf)
    org "BackupSetAA" # your organization name for reports
    mailto "xxxxxx" # space separated list of operators at your site
    dumpcycle 12weeks # the number of days in the normal dump cycle
    runspercycle 12 # the number of amdump runs in dumpcycle days
    tapecycle 40 # the number of tapes in rotation
    runtapes 40 # number of tapes to be used in a single run of amdump
    tpchanger "chg-manual" # the tape-changer glue script
    tapedev "/dev/nst0" # the no-rewind tape device
    changerfile "/etc/amanda/BackupSetAA/chg-manual.conf" # tape changer configuration parameter file
    changerdev "/dev/null" # tape changer configuration parameter device
    tapetype LTO4-HWC # what kind of tape it is
    labelstr "^AA[0-9][0-9][0-9][0-9]*$" # label constraint regex: all tapes must match
    dtimeout 1800 # number of idle seconds before a dump is aborted
    ctimeout 30 # max number of secconds amcheck waits for each client
    etimeout 3000 # number of seconds per filesystem for estimates

    dumpuser "amandabackup" # the user to run dumps under
    inparallel 4 # maximum dumpers that will run in parallel (max 63)
    dumporder "sssS" # specify the priority order of each dumper
    taperalgo first # The algorithm used to choose which dump image to send
    displayunit "g" # Possible values: "k|m|g|t"
    netusage 150000 Kbps # maximum net bandwidth for Amanda, in KB per sec
    bumpsize 200 Gb # minimum savings (threshold) to bump level 1 -> 2
    bumppercent 20 # minimum savings (threshold) to bump level 1 -> 2
    bumpdays 1 # minimum days at each level
    usetimestamps yes
    device_output_buffer_size 128000k
    label_new_tapes "AA%%%%"

    maxdumpsize -1 # Maximum total size the planner will schedule
    # for a run (default: runtapes * tape_length) (kbytes).
    amrecover_do_fsf yes # amrecover will call amrestore with the
    # -f flag for faster positioning of the tape.
    amrecover_check_label yes # amrecover will call amrestore with the
    # -l flag to check the label.
    bumpmult 4 # threshold = bumpsize * bumpmult^(level-1)
    amrecover_changer "changer" # amrecover will use the changer if you restore
    # from this device. It could be a string like 'changer' and amrecover will use your
    # changer if you set your tape to 'changer' with 'setdevice changer' or via
    # 'tapedev "changer"' in amanda-client.conf
    autoflush no
    infofile "/etc/amanda/BackupSetAA/curinfo" # database DIRECTORY
    logdir "/etc/amanda/BackupSetAA/logs" # log directory
    indexdir "/etc/amanda/BackupSetAA/index" # index directory
    tapelist "/etc/amanda/BackupSetAA/tapelist" # index directory
    define interface local {
    comment "a local disk"
    use 200000 kbps
    }

    define dumptype global {
    comment "Global definitions"
    auth "bsdtcp"
    }
    define dumptype nocomp-tar {
    comment "GNUTAR based dump"
    global
    program "GNUTAR"
    exclude list "/etc/amanda/exclude.gtar"
    compress none
    priority high
    tape_splitsize 25 Gb
    index yes
    record yes
    }
    define tapetype LTO4-HWC {
    comment "just produced by tapetype prog (hardware compression on)"
    length 788480 mbytes
    filemark 0 kbytes
    tape_splitsize 25 Gb
    speed 94896 kps
    }

    ------------- (log snippet)
    INFO amdump amdump pid 30272
    INFO planner planner pid 30318
    DISK planner xxxx /
    DISK planner xxxx /boot
    DISK planner xxxx /home
    DISK planner xxxx /var/ftp
    START planner date 20091213212136
    INFO planner Adding new disk xxxx:/.
    INFO planner Adding new disk xxxx:/boot.
    INFO planner Adding new disk xxxx:/home.
    INFO planner Adding new disk xxxx:/var/ftp.
    INFO driver driver pid 30319
    START driver date 20091213212136
    STATS driver hostname loki
    STATS driver startup time 0.005
    INFO dumper dumper pid 30323
    INFO dumper dumper pid 30324
    INFO dumper dumper pid 30321
    INFO dumper dumper pid 30322
    INFO taper taper pid 30320
    ERROR planner Request to xxxx failed: timeout waiting for REP
    WARNING planner disk xxxx:/var/ftp, estimate of level 0 timed out.
    FAIL planner xxxx /var/ftp 20091213212136 0 "[disk /var/ftp, all estimate timed out]"
    FINISH planner date 20091213212136 time 3601.427
    INFO planner pid-done 30318
    INFO dumper gzip pid 21929
    START taper datestamp 20091213212136 label AA0001 tape 1
    PART taper AA0001 1 xxxx /home 20091213212136 1/-1 0 [sec 18.061213 kb 10240 kps 566.960813]
    PART taper AA0001 2 xxxx /home 20091213212136 2/-1 0 [sec 0.718334 kb 10240 kps 14255.207188]
    PART taper AA0001 3 xxxx /home 20091213212136 3/-1 0 [sec 0.324078 kb 10240 kps 31597.331507
    ------
    Last edited by stevecs; December 14th, 2009 at 04:33 AM.

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