Here are more stats. Do these look average for performance? It is difficult to understand why the system was working with few load spikes before.
A mailman mailing list sends 10kbyte message to 4000 users having accounts on this cyrus system. If I grep "Delivered" in the maillog by the minute I can see how fast the messages are stored. e.g.: # grep Delivered /var/log/maillog | grep 'Jan 23 10:37' | wc -l 696 That is the best. This peak event pushed the load to 14 for 12 minutes, where it averages 604 messages delivered to cyrus mailboxes per minute. Is that reasonable for maximum delivery rate? I've also backed out the change (yesterday) to /sys/block/sda/queue/nr_requests I think it was pushing the load higher and there is no advantage in my hardware (SAS with Perc 5/i Raid 5 over 4 disk) to run with a low value for nr_requests.
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