> Jure PeÄar wrote: >> This sounds interesting. With two levels deep hash one would easily get >> around 32k subdirs per dir limit most file systems have, which >> basically leaves you without much choice but reiserfs. >> > > IBM jfs limit is 4G. That might be another option other than ReiserFS.
Another good option is XFS, especially now that delayed expunge can be used. At least XFS handles millions of subdirs per dir without any problems. I guess the whole directory hashing of programs like cyrus-imapd or squid is in vain for those filesystems. Are there other reasons to use dirhashing? Maybe internal limitations in the applications itself? Simon > >> I'm getting dangerously close to 32k users per letter and I don't feel >> comfortable with fulldirhash. Even with fulldirhash one can have at >> most 26*32k (~850k) users per instance, assuming nice even >> distribution ... But two level hash would raise this limit way up and >> give more choice of filesystems. > ---- Cyrus Home Page: http://asg.web.cmu.edu/cyrus Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
