Weird compression results for DLE using 'compress NONE' (nocomp-root)

Hi

I've got several disks that are showing weird compression results in theamanda report. Here's one of them:

DUMPER STATS TAPER STATSHOSTNAME DISK L ORIG-KB OUT-KB COMP% MMM:SS KB/s MMM:SS KB/s

------------------------------------ ------------------------------------------ 
---------------
host     /disk                     1   2031690    4063380  200.0   36:34 1852.3 
  6:27  10487.2


Note the ORIG-KB blows out to twice the size! COMP% is 200.0...

This happens on more that one disk actually. I chose this disk as it'sthe biggest disk that I dump, it shows the most expansive blowout and Inoticed it first. This disk uses 'compress NONE' (dumptype isnocomp-root). Some of the other disks showing compression weirdness areusing 'compress client fast' in their DLE's.


Just so you know, I'm using file tapes for this backup. The size on disk is:

-rw------- 1 amanda disk 4160933888 Jan 21 22:53 00018.host._disk.1

The server is amanda 2.6.0p2 and the client is amanda 2.4.4p3-1. Thereare a few more details below that may help. I'm not sure what'shappening but do appreciate any help regarding the strange results.


Thanks in advance,

Tom

amadmin conf disklist shows:

   host host:
       interface default
   disk /disk:
       program "DUMP"
       priority 0
       dumpcycle 7
       maxdumps 1
       maxpromoteday 10000
       bumppercent 20
       bumpdays 1
       bumpmult 4.000000
       strategy STANDARD
       ignore NO
       estimate CLIENT
       compress NONE
       encrypt NONE
       auth BSD
       kencrypt NO
       amandad_path X
       client_username X
       ssh_keys X
       holdingdisk AUTO
       record YES
       index YES
       starttime 0000
       fallback_splitsize 10Mb
       skip-incr NO
       skip-full NO
       spindle -1

the log entries for that disk are:

SUCCESS dumper host /disk 20090121214501 1 [sec 2193.730 kb 4063380 kps1852.3 orig-kb 2031690]SUCCESS chunker host /disk 20090121214501 1 [sec 2193.762 kb 4063380 kps1852.3]STATS driver estimate host /disk 20090121214501 1 [sec 2090 nkb 4064493ckb 4064512 kps 1945]PART taper conf 18 host /disk 20090121214501 1/1 1 [sec 387.462180 kb4063380 kps 10487.165483]DONE taper host /disk 20090121214501 1 1 [sec 387.462180 kb 4063380 kps10487.165483]


--

Tom Robinson
System Administrator

MoTeC

121 Merrindale Drive
Croydon South
3136 Victoria
Australia

T: +61 3 9761 5050

F: +61 3 9761 5051M: +61 4 3268 7026

E: tom.robinson AT motec.com DOT au