On 19.7.2011. 19:54, Chuck Swiger wrote:
On Jul 18, 2011, at 11:04 PM, Kevin Oberman wrote:
I just wish FreeBSD had some decent documentation on such a fundamental
operation. Fortunately there are some pretty good articles folks have
written, but they did leave me with several questions.
Is there something in FreeBSD which is preventing you from using the drive's
native DEV_BSIZE of 4096 bytes, or is it that the drive claims to have a
physical block size of 512 bytes when it is really 4k?
Nope, "only" that.
The current state of the matter (i.e. for 9.0) is:
* The new ATA driver has quirks for certain models of HDDs which have
this false advertising (which can be manually triggered by
kern.cam.ada.X.quirks=1) which causes the drive to report stripesize of 4k.
* This information is used in gpart to size & align partitions; it
will be used by the new installer
* Default fragment size for UFS was raised to 4K so it will be aligned
by default.
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