AdvFS defragment gives -8% freespace. What?

From: Gwen Pettigrew <gwen_at_itg.cam.ac.uk>
Date: Mon, 12 Jul 1999 09:58:45 +0100

Hi
After running a defragment on one of my AdvFS domains I got the standard message
from the -v option.

The first pass gave

defragment: Defragmenting domain 'variation'

Pass 1; Clearing
  Volume 1: area at block 31687632 ( 1814288 blocks): 43% full
  Volume 2: area at block 26025280 ( 1865680 blocks): 2% full
  Volume 3: area at block 22574288 ( 6624432 blocks): 25% full
  Volume 4: area at block 11761088 ( 2129408 blocks): 36% full
  Domain data as of the start of this pass:
    Extents: 119954
    Files w/extents: 119640
    Avg exts per file w/exts: 1.00
    Aggregate I/O perf: 100%
    Free space fragments: 7313
                     <100K <1M <10M >10M
      Free space: 0% 3% 12% 85%
      Fragments: 3771 2029 1127 386

Which look all well and good.

However the second pass and subsequent passes gave me this

Pass 2; Clearing
  Volume 1: area at block 18449184 ( 946560 blocks): 23% full
  Volume 2: area at block 18292784 ( 4946688 blocks): 75% full
  Volume 3: area at block 4546880 ( 193312 blocks): 69% full
  Volume 4: area at block 7312496 ( 73632 blocks): 35% full
  Domain data as of the start of this pass:
    Extents: 119640
    Files w/extents: 119640
    Avg exts per file w/exts: 1.00
    Aggregate I/O perf: 100%
    Free space fragments: 6633
                     <100K <1M <10M >10M
      Free space: -8% 3% 14% 91%
      Fragments: 3193 1979 1100 361


A <100K freespace of -8%!!!!!! I havent seen this before. What is going on?

This was run on a AS8400 running 4.0B with patchkit 9 applied.

-- 
Gwen Pettigrew
Computer Officer
Institute of Theoretical Geophysics
Department of Earth Sciences
Downing Street
Cambridge
CB2 3EQ
UK
Tel 01223 333464
E-mail gwen_at_itg.cam.ac.uk
W3 http://www.itg.cam.ac.uk/ITG/members/gwen/
Received on Mon Jul 12 1999 - 09:10:40 NZST

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