BTW. If you're using v2.2.3+ %N hash works better than the old %H hash. I updated http://wiki2.dovecot.org/Variables for it also.
On 8.8.2013, at 1.42, Eliezer Croitoru <elie...@ngtech.co.il> wrote: > In squid we use a double layer of hashed directories on the FS to allow > storage of millions of files. > I was reading the "Directory hashing" section but never understood it.. > since it's written.. in a way I could not understand. > I am using this line: > mail_location = maildir:/home/vmail/%d/%n/Maildir/ > > and I want to migrate to a hash based directory scheme. > While trying to understand how that hash will work I stumbled a old > thread at: > http://www.dovecot.org/list/dovecot/2010-June/049695.html > there they used: > mail_location=maildir:/buzones/us.es/%1Hu/%2.1u/%n > > so I assume it should be used like that: > mail_location=maildir:/home/vmail/%H/%2.256Hn/%d_%n/Maildir/ > or: > mail_location=maildir:/home/vmail/%1Mu/%2.1Mu/%d_%n/Maildir/ > > It's a bit hard to think alone so I hope you can assist me. > > let say I want to follow the model of squid cache_dir which has: > cache_dir aufs /usr/local/squid/var/cache/squid 40000 16 256 > > And means a two layers cache of max 16 directories on the first layer > and 256 directories on the second layer. > The above allows millions of files storage and can benefit from all ext4 > lower kernel levels of compatibly rather then do stuff on the user-land.. > Since I am not 100% sure that the scheme I understood is indeed what I > think I assume the above will need a small correction. > > Eliezer >