Hello,

aufs 2-standalone.tree-20091207 (Ubuntu 10.04 LTS 32Bit)

aufs mountpoint: /mnt/aufs

Problem: aufs is quite slow due to re-reading all branches on every ls /mnt/aufs

Number of branches: 80

Files per branch: ~ max. 256

Duplicated files: no

UDBA: no

Branches RR: yes. (Only the first branch as the container is RW, but RW is not 
needed anyway)

Options used for RW branch: 
-oudba=none,sum,rdhash=30720,rdblk=102400,rdcache=90,br:/mnt/s=rw

Options used for all RR branches:
-oudba=none,sum,rdhash=30720,rdblk=102400,rdcache=90,remount,append:/mnt/1=RR
-oudba=none,sum,rdhash=30720,rdblk=102400,rdcache=90,remount,append:/mnt/2=RR
...etc.
-oudba=none,sum,rdhash=30720,rdblk=102400,rdcache=90,remount,append:/mnt/80=RR

Those RR branches do not contain duplicated files within the SAME directory, so 
each filepath is unique.
However files with the same name show up in DIFFERENT directories.
/mnt/1/1.dat, /mnt/1/2.dat etc.
/mnt/2/1.dat, /mnt/2/2.dat etc.

>From /mnt/aufs it looks like:
/mnt/aufs/1/1.dat /mnt/aufs/1/2.dat etc.
/mnt/aufs/2/1.dat /mnt/aufs/2/2.dat etc.

Those RR branches are connected via "slower" WAN connection, aufs is used to 
unify them.

As you can see, i tried increasing the cache timeout and also the cachesize, 
both without success.
Also disabling udba (udba=none) did not help.
On every ls to /mnt/aufs, aufs re-reads each branch.

Is this by design, or am i missing a configuration option?

Thank you very much, best regrads


Wolfgang Alper
___

Altrust Consulting GmbH
In der Horst 43
D-32278 Kirchlengern
Germany




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