Re: Definitive guide to running ObjectiveFS on top of a Clustered File System?

Am 02.06.21 um 17:09 schrieb Roel van Duijnhoven:

I am working on migrating a Dovecot system with + 50.000 users / 5TB on mail data to a new set-up that is better scalable. But I found it difficult to find a good solution. In this email I lay out what I learned, in the hope that others can profit. But also others can help me on this design before I actually start migrating.

Hello Roel,

we're also planing a similar migration but choose a slightly other way:

• we split our users in a number of shards (10-20k per shard)
• lmtp and imap traffic hit a number of director servers (TCP loadbalancer or dns-rr)
• director determine the user's shard and direct the connection to the right shard backend
• a backend (pair of two machines) authenticate imap traffic and dsync to it's secondary

advantages:

• no cold standby machines
• scalable by adding pairs of backends
• scalable by adding new single directors
• every machine could be taken offline for maintenance
• every machine could fail without data lost or service degradation
• no proprietary software needed

The are our ideas ... Andreas