My organization need to have:
- 75000 maiboxes
- 10000 simultaneous connections (IMAP)
- 3000 mailboxes with 1Gb and 65000 with 200Mb
- 12 Tb for spool ( EMC Clarion Storage )
- 15 servers with Xeon 2.6ghz - 8gb RAM
- GNU/Linux 2.6 for Operating System ( RedHat, Debian etc ... )
- ~ 150000 messages / day
- Postfix as MTA
I made several tests to choose filesystem.
Cluster FS( gfs, ocfs ), ext3, ext4 , reiserfs , xfs and etc..
my choice
ext3 with dir_index, noatime, nodiratime
and partition my problem with Cyrus Murder.
My doubts are:
- Exist a recommended number of conections to a front end server ?
( a parameter in sysctl.conf in GNU/Linux )
- Exist a recommended size to a Backend server ( Ex: 1 Tb )?
Cyrus IMAP works great with large mailboxes an billions of small files.
Backup is my big problem.
- Exist any solution better than make a SNAPSHOT of STORAGE and backup all file system (/dev/sdaX ) ?
I know that performance is terrible with billions of small files, and make tests using tar . ( ex: a.tar.gz = /var/spool/imap/a/ ), this approach increase the performance with my LTO tapes.
Anyone has another suggestion ?
Regards,
Lucas Zinato Carraro
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