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liyy
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Does rsync use as mirror server for Linux email system

Can rsync used for mirror mailboxes to another Linux server as a failover purpose?

Existing email system using Kerio mail system.
LinuxEmail Servers

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wesly_chen

8/22/2022 - Mon
wesly_chen

For failover, you need to realtime sync the data. rsync can not do it real time.

I would recommend that you use filesystem mirror such GFS to do it.
Here is the reference for Redhat GFS
liyy

ASKER
Thanks wesly,

But why some users use rsync for mirror their servers, I saw many reference website from google? They propose to use rsync to sync data between two servers, it seems common way found in google.
wesly_chen

one time mirror or real-time mirror?
real-time is the key point,
If you don't might for a couple hours of data lost/delay, then you can use rsync.
For email, I won't use rsync for fail-over system but daily/weekly backup is ok.
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liyy

ASKER
thanks wesly,

I know the real-time mirror, but what is mean one time mirror?

I know that rsync is not suitable for real-time environment, if the real-time traffic is slow, I mean not much emails in/out and under 20 emailboxes, will you recommend using rsync, what other solution you will suggest for failover for email system?
wesly_chen

Sorry, shouldn't use one-time mirror.
For the first time, rsync copy the whole directory. Then it copy the delta(update files) only.
You can measure how many files are copied via rsync every hour (set in cron), then you have an idea how many emails will be lost for fail-over. If the email lost is not a big deal, then rsync more often should be ok.

Other low cost solution, like buy two hardware identical system, setup software RAID1 on two identical disks. If one system died not due to hard disk, then move one hard disk to the fail-over system.....
liyy

ASKER
is it possible rsync every minute, of course, it is not the best solution for the online email system
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