Scaling of imap servers

Vincent Fox vbfox at
Thu Jun 16 12:18:53 EDT 2011

On 6/16/2011 7:24 AM, Pascal Gienger wrote:
> 20K users with 20G each = 400 TB. With zfs compression perhaps 300 TB.
I dunno, I find that people use FAR FAR less than their quota on average.
Sure you've got the 1 doctor who sends a bunch of X-rays or something
but most people wouldn't fill up a 1-gig quota unless they were trying to.
I'd be curious to know what the statistics are for actual USAGE by email
users on a really big install.

We could give our users unlimited IMO and it wouldn't make a difference
worth losing sleep over.  I view quota as more of a tool to make slobs
throw out some junk occasionally, and if they really need more they will
phone in and we'll raise their quota.  Something like 20K users here and
using only about 35% of our 3TB of storage.  Using ZFS compression so
that gains us efficiency.  OK there's the single instance store savings too
but I don't know how to quantify that effect.  We also keep 14 days of
snapshots in the pools for easy recovery of "lost" emails.

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