Date: Wed, 30 Aug 2017 19:37:03 -0600 From: JD <jd1008@gmail.com> To: freebsd-questions@freebsd.org Subject: Re: help creating new gmirror > 2TB Message-ID: <59A7683F.5070102@gmail.com> In-Reply-To: <CAFsnNZ%2ByU-S1QBVJDrapy_N1mi3kUrHSbcbzNuDgTUceXwXPyA@mail.gmail.com> References: <CAFsnNZLeuLYEJVozsoSvDtvgfMf4UueJhm37waOQ5_kyxs-rhg@mail.gmail.com> <26f5e88e-1ea7-6332-ca5e-f055cfbdd280@fjl.co.uk> <CAFsnNZ%2ByU-S1QBVJDrapy_N1mi3kUrHSbcbzNuDgTUceXwXPyA@mail.gmail.com>
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I thought that hdparm could work with the firmware to set the sector size. Not sure on this because hdparm has gone through a lot of modifications over the years. On 08/30/2017 06:35 PM, William Dudley wrote: > I've never heard of AFD, and is having 4K sectors something I have control > of? Or is tthat something the manufacturer controls? > > My drives are: 2 of Seagate 4TB IronWolf NAS SATA 6Gb/s NCQ 64MB Cache > 3.5-Inch Internal Hard Drive (ST4000VN008) > > Which doesn't have the magic word "AFD" anywhere in the description. > > Also, I happen to like the idea of "fixing" the gmirror code to put it's > metadata in the penultimate sector if it discovers GPT > in the last sector, but I suppose I shouldn't get my hopes up. > > Bill Dudley > > On Wed, Aug 30, 2017 at 5:57 PM, Frank Leonhardt <frank2@fjl.co.uk> wrote: > > "I'm sure you'll be okay with MBR assuming it's an AFD (4K sector drive)." > > On 29/08/2017 21:12, William Dudley wrote: >>> Hi, >>> >>> I want to create a simple mirror > 2TB on a FreeBSD 10.3 system. >>> >>> I have 2 identical 4TB disks. >>> >>> The examples in freebsd handbook "geom-mirror" pages show creation of a >>> 2TB >>> mirror using >>> MBR partitioning, and that has an upper limit of 2TB. >>> >> I still get a bit worried about this, but I'm 99.9% sure you'll be okay >> with MBR assuming it's an AFD (4K sector drive). The bodge/workaround >> works. If it's SAS instead of SATA, all bets are off. >> >> Although I use ZFS a lot, I still prefer geom mirror for twin-disk >> systems. I feel a lot more comfortable booting from it in the event of a >> failure. ZFS has its good points, but so does UFS. >> >> Trying to get geom mirror to work with GPT as it stands just leads to >> pain. I've taken a look at the code with a view to fixing this is no one >> else does, but UFS is so un-cool in most circles and I don't fancy doing it >> alone in case I zap someone's data. it doesn't look that tricky to move the >> metadata somewhere else, and by checking for a GPT you can select between >> the old/new block. It's unexpected interactions I'm worried about. >> >> I think we're safe with MBR until we pass 16Tb. >> >> Regards, Frank. >> >> >> >> _______________________________________________ >> freebsd-questions@freebsd.org mailing list >> https://lists.freebsd.org/mailman/listinfo/freebsd-questions >> To unsubscribe, send any mail to "freebsd-questions-unsubscribe >> @freebsd.org" >> > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" >
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