[Dovecot] Doubts about dsync, mdbox, SIS

Alessio Cecchi alessio at skye.it
Thu Feb 2 09:46:55 EET 2012

Il 01/02/2012 13:29, Jan-Frode Myklebust ha scritto:
> I've been running continous dsync backups of our Maildirs for a few
> weeks now, with the destination dsync server using mdbox and SIS. The
> idea was that the destination server would act as a warm copy of
> all our active users data.

How many users there are in this installation?

> The active servers are using Maildir, and has:
> 	$ df -h /usr/local/atmail/users/
> 	Filesystem            Size  Used Avail Use% Mounted on
> 	/dev/atmailusers       14T   12T  2.2T  85% /usr/local/atmail/users
> 	$ df -hi /usr/local/atmail/users/
> 	Filesystem            Inodes   IUsed   IFree IUse% Mounted on
> 	/dev/atmailusers        145M    113M     33M   78% /usr/local/atmail/users
> very little of this is compressed (zlib plugin enabled during christmas).

This is the old storage in Maildir format?

> I'm surprised that the destination server is so large, was expecting zlib and
> mdbox and SIS would compress it down to much less than what we're seeing
> (12TB ->  5TB):
> 	$ df -h /srv/mailbackup
> 	Filesystem            Size  Used Avail Use% Mounted on
> 	/dev/mapper/mailbackupvg-mailbackuplv
>                        5.7T  4.8T  882G  85% /srv/mailbackup

This is the new storage in mdbox format?

What size you would expect?
Alessio Cecchi is:
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