[9fans] venti arena

[Kenji Arisawa <arisawa@ar.aichi-u.ac.jp>]

Hello,

Why anena.n range  are different among those that are shown by
fmtarenas, fmtindex and checkarenas ?
And why arena.30 exceeds limit of arena size?
How to understand these range ?

Kenji Arisawa

term% venti/fmtarenas arena. /dev/sdD1/arena
clearing the partition
configuring /dev/sdD1/arena with arenas=31 for a total storage of
bytes=16166273024 and directory bytes=65536
adding arena arena.0 at [335872,537206784)
adding arena arena.1 at [537206784,1074077696)
adding arena arena.2 at [1074077696,1610948608)
adding arena arena.3 at [1610948608,2147819520)
adding arena arena.4 at [2147819520,2684690432)
...
adding arena arena.27 at [14495850496,15032721408)
adding arena arena.28 at [15032721408,15569592320)
adding arena arena.29 at [15569592320,16106463232)
adding arena arena.30 at [16106463232,16166608896)


term% venti/fmtindex venti.conf
configure index section in /dev/sdD1/isect
configure arenas in /dev/sdD1/arena
using 65495 buckets of 65495; div=65578
add arena arena.0 at [1048576,537903104)
add arena arena.1 at [537903104,1074757632)
add arena arena.2 at [1074757632,1611612160)
add arena arena.3 at [1611612160,2148466688)
add arena arena.4 at [2148466688,2685321216)
add arena arena.5 at [2685321216,3222175744)
...
add arena arena.28 at [15032975360,15569829888)
add arena arena.29 at [15569829888,16106684416)
add arena arena.30 at [16106684416,16166813696)
configured index=main with arenas=31 and storage=16165765120
term%

term% venti/checkarenas -av /dev/sdD1/arena
arena='arena.0' [344064,537214976)
	version=4 created=1042806254 modified=1045717237
	clumps=74,320 compressed clumps=30,781 data=498,283,412 compressed
data=390,632,400 disk storage=395,314,560



term% ls -lp /dev/sdD1
--rw-r----- S 0 arisawa arisawa 16166614016 Sep 26 07:59 arena
--rw-r----- S 0 arisawa arisawa  1073741824 Sep 26 07:59 fossil
--rw-r----- S 0 arisawa arisawa   536870912 Sep 26 07:59 isect
term%