Bob Kinney writes:
Gordon:I don't have any suggestions on the benchmarking front, but I can offer a few pieces of very general advice:Thanks for the advise, some are not applicable unfortunately. For a clearer picture; our setup is the following:* NetApp Filer with FC disks serving NFS * 4 Linux servers mounting NetApp volume for user Maildirs * Mail is spooled on local drives before being delivered to NFS Maildirs* Mail services (IMAP, POP, SMTP) are load balanced with network load balancerWe've already broken up his mail quite a bit (by first letter of e-mail, by year) but that leads to him complaining about not being able to find any given e-mail. This is a man who pretty much has every e-mail he's ever received for the last 8+ years.Even with this break down some of his folders are still rather large, so we may have to investigate breaking it down further. Is there a known limit to the number of subscribed folders?
You shouldn't run into problems until at least ~10,000 folders, in a single mail account.
With your setup, your single biggest bottleneck will be network bandwidth. Your servers should have dual NICs. One network interface for storage, the other for client IMAP connections. Your storage interface should be the fastest interface that's supported by your filers. 1gb is just the starting point. If your filers can talk fiber, use it.
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