Mailstore filesystem

[Greg A. Woods]

At Mon, 03 Jul 2006 17:22:07 -0500,
Phil Brutsche wrote:
> 
> Søren Schimkat wrote:
> > 
> > Which filesystem would you recomend?
> 
> ext3, hands down.

Or good old trusty FFS, as the case may be.  :-)

(It is more than rock solid, and has been tested for decades on dozens
of different machine architectures and in many radically different kinds
of kernel architectures too.)

Currently the largest spool I manage directly (for a small ISP) looks
like this (it's running NetBSD-1.6_STABLE on a big Alpha with a nice
Apple Xserve RAID):

As you will see block consumption well out-paces inode consumption.  If
I remember correctly the various newfs parameters were automatically
calculated from the block/frag numbers specified in the disk label,
which were 16k/2k.

# BLOCKSIZE=16384 df -i /var/spool/imap
Filesyst 16384-blocks     Used    Avail %Cap    iUsed  iAvail %iCap Mounted on
/dev/sd5a    66561885  1921235 63975031   2%  1150960 65946638   1% /var/spool/imap

# dumpfs /var/spool/imap | sed 23q 
file system: /dev/rsd5a
endian  little-endian
magic   11954   time    Tue Jul 11 17:39:52 2006
id      [ 0 0 ]
cylgrp  dynamic inodes  4.4BSD  fslevel 3       softdep disabled
nbfree  64626086        ndir    33252   nifree  65946639        nffree  139367
ncg     5242    ncyl    131048  size    536772608       blocks  532495087
bsize   16384   shift   14      mask    0xffffc000
fsize   2048    shift   11      mask    0xfffff800
frag    8       shift   3       fsbtodb 2
cpg     25      bpg     12800   fpg     102400  ipg     12800
minfree 1%      optim   space   maxcontig 4     maxbpg  4096
rotdelay 0ms    rps     250
ntrak   128     nsect   128     npsect  128     spc     16384
symlinklen 60   trackskew 0     interleave 1    contigsumsize 4
maxfilesize 0x000400400402ffff
nindir  4096    inopb   128     nspf    4
avgfilesize 16384       avgfpdir 2000
sblkno  8       cblkno  16      iblkno  24      dblkno  824
sbsize  2048    cgsize  16384   offset  32      mask    0xffffff80
csaddr  824     cssize  83968   shift   10      mask    0xfffffc00
cgrotor 0       fmod    0       ronly   0       clean   0x02
blocks available in each of 1 rotational positions


-- 
						Greg A. Woods

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