Messages in this thread | | | Date | Tue, 10 Apr 2012 20:36:27 +0200 | From | Jens Axboe <> | Subject | Re: [RFC PATCH] block: Change default IO scheduler to deadline except SATA |
| |
On 2012-04-10 18:13, Mike Snitzer wrote: > That said, we can have a _very_ good hint that a SCSI device is a raid array if: > > 1) optimal_io_size is not zero, minimum_io_size is not equal to > optimal_io_size, and optimal_io_size is a multiple of minimum_io_size > > 2) WCE=0 (higher-end arrays with a writeback cache)
Any other device than a basic SATA disk will have WCE=0. So I don't think that gives you a very good hint of the nature of it, unfortunately.
-- Jens Axboe
| |