Date: Fri, 21 Nov 2014 17:03:42 -0700 (MST) From: Warren Block <wblock@wonkity.com> To: Nathan Whitehorn <nwhitehorn@freebsd.org> Cc: Rostislav Krasny <rosti.bsd@gmail.com>, freebsd-sysinstall@freebsd.org Subject: Re: Dangerously dedicated mode with FreeBSD 10.1 Message-ID: <alpine.BSF.2.11.1411211647590.27494@wonkity.com> In-Reply-To: <546FC5C8.7020303@freebsd.org> References: <CANt7McFwQJNmBEJGTed%2B27K%2BVAY80V1zJSXBwHC0TmrX1iyPpw@mail.gmail.com> <alpine.BSF.2.11.1411210815470.12278@wonkity.com> <546F6D79.9060909@freebsd.org> <alpine.BSF.2.11.1411211527040.27494@wonkity.com> <546FBEC0.500@freebsd.org> <alpine.BSF.2.11.1411211556560.27494@wonkity.com> <546FC5C8.7020303@freebsd.org>
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On Fri, 21 Nov 2014, Nathan Whitehorn wrote: >> This might be an "Advanced Format" thing, where the drive uses 4K sectors >> but reports that it uses 512-byte sectors. The forum thread shows that it >> does not align to 4K on SSDs. My SSDs also report 4K stripesize but only >> 512 byte sectoresize. >> > > Sure, but the installer aligns to the reported "stripe size". For AF disks > like your SSD, the kernel reports the right thing in the stripe size. > > Where in the forum thread does it show an issue? The only thing I see is some > gpart output from a 10K spinning SAS disk, which almost certainly has > 512-byte physical sectors. Hmm, I thought that was still about an SSD. I sent a followup asking for the block size of the drive. I set out to test this on a machine with an SSD, but can't get an install image to work from my PXE setup (it can't find the install disk label), and have no easily-accessible DVD drives or empty memory sticks right now. It seems like it should be easier than this. Anyway, for now let's say it works.
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