Amanda-Users

Avg Dump Rate and Compression

2004-03-23 20:55:48
Subject: Avg Dump Rate and Compression
From: Fernando Serto <fernando.serto AT memetrics DOT com>
To: amanda-users AT amanda DOT org
Date: Wed, 24 Mar 2004 12:49:11 +1100
hello guys, I'm new to amanda (and the list)...

I just installed amanda for the first time, and was doing some backups/tests
using it.

My doubt is... isn't 324.7 K/s for dump rate too slow? I was backing up 1Gb
of data and it's taking almost 1 hour! does that mean that for 12Gb I'll get
something close to 12 hours?

my tapetype is:

define tapetype DDS-3 {
    comment "Sony SDT-9000 (DDS-3)"
    length 11631 mbytes
    filemark 434 kbytes
    speed 1139 kbytes
}

shouldn't it run at 1139 K/s?

another thing, I tried using compress server best and compress client best
and I get no difference at all on the backups, same time to run, same amount
of data, and same tape usage.

below is a dump report for the last test I've ran.

These dumps were to tape DailySet02.
The next tape Amanda expects to use is: DailySet01.


STATISTICS:
                          Total       Full      Daily
                        --------   --------   --------
Estimate Time (hrs:min)    0:00
Run Time (hrs:min)         0:59
Dump Time (hrs:min)        0:58       0:58       0:00
Output Size (meg)        1104.6     1104.6        0.0
Original Size (meg)      1104.6     1104.6        0.0
Avg Compressed Size (%)     --         --         -- 
Filesystems Dumped            1          1          0
Avg Dump Rate (k/s)       324.7      324.7        -- 

Tape Time (hrs:min)        0:58       0:58       0:00
Tape Size (meg)          1104.6     1104.6        0.0
Tape Used (%)               9.5        9.5        0.0
Filesystems Taped             1          1          0
Avg Tp Write Rate (k/s)   324.5      324.5        -- 

USAGE BY TAPE:
  Label            Time      Size      %    Nb
  DailySet02       0:58    1104.6    9.5     1


NOTES:
  planner: tapecycle (1) <= runspercycle (1)
  planner: Last full dump of handsoff:/home/data/archive on tape DailySet01
overwritten in 1 run.
  taper: tape DailySet02 kb 1131200 fm 1 [OK]


DUMP SUMMARY:
                                     DUMPER STATS            TAPER STATS 
HOSTNAME     DISK        L ORIG-KB OUT-KB COMP% MMM:SS  KB/s MMM:SS  KB/s
-------------------------- --------------------------------- ------------
handsoff     -ta/archive 0 11311501131150   --   58:03 324.7  58:06 324.5

(brought to you by Amanda version 2.4.4p2)



cheers,

--
Fernando Serto
Systems Administrator
Memetrics Pty.
Phone: +61 2 95560833
Fax: +61 2 95556911
Mobile: 0403 338 005
E-mail: fernando.serto AT memetrics DOT com

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