.hotfiles.btree
.hotfiles.btree
- Subject: .hotfiles.btree
- From: "Gerriet M. Denkmann" <email@hidden>
- Date: Tue, 19 Aug 2008 14:09:24 +0700
Some questions about .hotfiles.btree which are not answered by tn1150
(all quotes from there).
1. how to get a .hotfiles.btree? I have several partitions (volumes)
"whose size is at least 10GB, and which have journaling enabled."
But: No "metadata zone is established when the volume is mounted" nor
is a .hotfiles.btree created, nor does "the clumpSize field of the
fork data structure" ever seems to change.
2. The only case where a .hotfiles.btree seems to work is my boot
partition. Known bug, feature, or error on my side?
3. When do clumpSizes get updated? Seems like immediately when read
from disk, but not when read from some file cache. Correct?
4. When does the hotfiles.btree gets updated? Who or what triggers
the update? Is possible to tell someone in charge to update the
hotfiles.btree right now? By sending some signal to some process?
5. "The fork's temperature can be computed by dividing its clumpSize
by its totalBlocks." This formula does not give results even close to
the things I see.
temperature = clumpSize * blockSize (4096) / logicalSize gives more
plausible results.
But even so some entries do not make sense.
E.g.:
[ forkType 0 temperature 3458460 fileID 486463 ] = "Users"
[RootFolder nodeName: "Users"]
fileID = 486463 flags: hasThread
Creator: 1919443312 = 'rhap'
HfsType: 1936485995 = 'slnk'
Data Fork:
logicalSize 28 (bytes)
clumpSize 147
totalBlocks 1 (4096 bytes)
With my formula I get a temperature = 21,504 instead of 3458460 in
the hotfiles.btree.
Also anything cooler than 10 000 degrees Celsius (or Kelvin?) has
temperatures in the hotfiles.btree which are much too low; obviously
not updated since ages.
But threshold (minimum temperature): 24
And timeleft = 0.8 days and never changing.
6. "Files whose temperature is less than this value (threshold) will
be moved out of the hot file area." When? If the hot file area gets
full?
All this on Tiger 10.4.11
Kind regards,
Gerriet.
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