Hi Pascal,thanks for your reply! I decided to ask my more specific questions in separate mails, but I have a few follow-up questions for you.
--On 5. Januar 2012 19:50:28 +0100 Pascal Gienger <pascal.gienger@xxxxxxxxxxxxxxx> wrote:
In principle it is simple, but I hit a hard ground today. I did the mistake to miscalculate the "converting indexes".... Our storage was perfectly sized to handle the needed IOPS for cyrus operation, but having 8000 index files being rebuild simultaneosuly...
I am very aware of that issue, but we haven't yet decided how to handle it. I'm actually considering a scheduled downtime for the conversion. I'm planning on performing the actual upgrade on a backup of our mail store to have an estimate of how long it's going to take.
Important: Set lmtp_mail_timeout (when you use postfix to deliver mail) to a low value, like 2seconds, because also cyrus lmtpd triggers the index rebuild of a INBOX. So people with less mail in their INBOX (which already constructed index and cache) still get their mail in their INBOX, and people having MANY mails so that the index rebuild takes time will get the mail later due to the early deferred state (after lmtp_mail_timeout). Otherwise you'll have many blocked Postfix lmtp and no mail gets transferred.
That's a Postfix option, I suppose? We use Sendmail. I don't think there's an exact equivalent for that option. Do you know after which LMTP command the rebuild takes place? I would assume that it's after "rcpt to:"? So the LMTP session has to wait for that before it can issue the "data" command? In that case I suppose I could use 'confTO_RCPT'.
And be familiar with expunge_mode: delete_mode: expunge_days: and the consequences on cyr_expire!
You mean that with "delayed" mode there's a lot to do for cyr_expire? But that hasn't changed between 2.3. and 2.4, right? I asked about expunge_days in a separate message.
With meta-partition on a fast SSD device this even would not have occured (500 GB SSD needed in our case....)
We don't have any of those, unfortunately ...
Sebastian
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