On Fri, 2009-05-15 at 17:13 -0400, Timo Sirainen wrote:

...

I could run stats here, with 12.000 users to see what the average size is...

It would be interesting to have some kind of statistics for cur/ directories and get <cur directory size> divided by <number of files in cur> and then see how many users have values that are much higher than average (i.e. how many users have had tons of mails that have since been deleted).

I wrote an ugly script for it, just change the "find ." path to wherever your maildirs are and run in some temp directory:

### total.sh #!/bin/sh

find . -name cur -exec ./diravg.sh {} \; > log count=cat log|wc -l avg=cat log | awk '{print $2"+"}'|tr -d '\n'|sed 's/^/(/'|sed "s,+\ $,)/$count\n,"|bc -l echo "average: $avg"

echo "3x higher:" cat log | perl -ne "@l = split(/ /); print if \$l[1] >= ($avg*3);"

### diravg.sh #!/bin/sh

dir=$1 files=/bin/ls $dir|wc -l if [ $files = 0 ]; then files=1 fi

ls -ld $dir|head -1|awk "{print \"$dir \" (\$5 / $files);}";

Hi Scott,

One could always run the mailstore on LVM and then you could snapshot the mount and then fsck it while still technically in use. It would probably slow down the filesystem, but it is still live. Uhm, and then you have a nice and fsck'd snapshot, but your live filesystem will still be untouched? Or do you propose replacing the mailstore with a (readonly?) versioned mounted from the lvm snapshot? I'm not aware of anything that can swap filesystems like this online (ie, with files open) and that would also mean that while fsck'ing, you can only read mail, not receive, move or delete mail?

Gr.

Matthijs

on 5-18-2009 8:46 AM Matthijs Kooijman spake the following:

Hi Scott,

...

One could always run the mailstore on LVM and then you could snapshot the mount and then fsck it while still technically in use. It would probably slow down the filesystem, but it is still live. Uhm, and then you have a nice and fsck'd snapshot, but your live filesystem will still be untouched? Or do you propose replacing the mailstore with a (readonly?) versioned mounted from the lvm snapshot? I'm not aware of anything that can swap filesystems like this online (ie, with files open) and that would also mean that while fsck'ing, you can only read mail, not receive, move or delete mail?

Gr.

Matthijs I re-read the howto on using fsck on LVM snapshots, and it is only good if the FS passes. Then you can update the fsck details in the filesystem. If the FS doesn't pass, you would still need to schedule a fsck when inactive.

My bad.