Jens Axboe wrote:
While I'm on the subject, there are a few related items that could be improved. In my tests, I was generating I/O requests simply by doing dd if=/dev/sda ... I don't know where the timeouts for these requests are determined, but they were set to 60 seconds. That seems much too long.Fully agreed, as Mike mentioned this actually looks like a dumb udev rule that didn't have any effect until this generic timeout work. For normal IO, something in the 10 second range is a lot more appropriate.
Yes and no. For direct-attach storage with no other initiators, ok. But for larger arrays, potentially with multiple initiators - no. I can name several arrays that depend on a 30 second timeout, and a few that, underload, require 60 seconds. I assume that there's usually "best practices" guides for the integrators to ensure the defaults are set right.
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