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sendmail Performance Tuning by Nick Christenson

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7.2. The Quick Fix

Despite our preventive measures, let us suppose a server does get itself into a jam and email backs up. Further suppose that we know the problem is that the disk on which the queue resides is not fast enough to handle the load. We may already have another disk ready and an outage window scheduled to perform the upgrade when the system will be less busy, perhaps after most people have gone home from work for the day. Once we can take the machine down, we plan to carefully back up the data on the queue disk, verify the backup, add the second disk, stripe the old and new disks together using software RAID, bring the system back up, test it, restore the backed-up data, verify that this restoration went well, restart services, ...

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