On 17.7.2010, at 0.07, Brandon Lamb wrote: >> sdbox is really simple. mdbox is more complex. A few people have used sdbox >> with v1.x, but it's more or less rewritten with v2.0. With v2.0 I'm not >> aware of any sdbox installations, but there is at least one somewhat large >> mdbox installation. They've had some problems, but I think those are mostly >> gone now. > > Any recommendation of one over the other?
Depends on the filesystem and disks I guess. mdbox should reduce mailbox fragmentation because it uses larger files. But maybe with SSDs that doesn't matter and the extra metadata just slows down. Or maybe not. I don't have any real world benchmarks. > I came across a 2009 mailing > list entry where you showed some benchmark tests that had mdbox as the > fastest. They were benchmarks of some unrealistic tests. > Without any experience yet, my only possible hangup is being > able to restore individual (lost, whatever other reason) mails for > customers. This is more difficult with sdbox and mdbox than with maildir. I haven't really thought about this before. I guess with both you could get the one file (or the entire mailbox, either way) and then force a index rebuild and then copy/extract the mail in some way (e.g. doveadm fetch, imap client, etc). >> dsync is awesome and preserves everything. But test it anyway just in case. >> I'd anyway recommend setting pop3_save_uidl=yes and sometimes after that >> (when you think everyone's logged in at least once) switching to >> pop3_uidl_format=%g while still running maildir. With Maildir the new UIDLs >> are then the filenames and with dbox the UIDLs will be message GUIDs. Those >> are much more permanent than anything based on IMAP UIDs. Not a requirement, >> but still :) > > Cool, if anything I could just have a script login to every users > account and logout and that would do the same thing right? That's all. > Any main/major/big reasons to try to go with mdbox over sdbox? sdbox > being really simple = less prone to typos and other bad things > happening? There is much less potential for mailbox corruption with sdbox, since it's so much simpler. > Oh, what about if i migrate to sdbox, then decide to go with mdbox, > will I want to know for sure ahead of time? Granted I guess thats kind > of an obvious yes, but any big gotchas to know about if I did? You can use dsync to easily switch between them.
