Date: Tue, 26 Jul 2011 09:03:58 -0400 From: John Baldwin <jhb@freebsd.org> To: Dimitry Andric <dim@freebsd.org> Cc: freebsd-fs@freebsd.org Subject: Re: 3TB drives on ZFS and booting Message-ID: <201107260903.58265.jhb@freebsd.org> In-Reply-To: <4E2E7B1B.2020906@FreeBSD.org> References: <4E2C9419.4000205@rcn.com> <201107250939.31746.jhb@freebsd.org> <4E2E7B1B.2020906@FreeBSD.org>
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On Tuesday, July 26, 2011 4:30:19 am Dimitry Andric wrote: > On 2011-07-25 15:39, John Baldwin wrote: > > On Sunday, July 24, 2011 5:52:25 pm Gary Corcoran wrote: > ... > >> Bottom line: would I be able to successfully build (and of course boot) a FreeBSD > >> ZFS-only system using only 3TB drives? > > You probably want to use GPT instead of MBR, but the GPT ZFS boot code shoul > > fully handle 64-bit LBAs just fine. > > Isn't that also dependent on the BIOS's ability to handle 64-bit LBA's? Yes, but the original EDD 1.0 spec that included the 'packet' and extended INT 13h functions included 64-bit LBAs, so at this point I would expect most BIOSes to support that. Also, only BIOSes for controllers that support logical disks > 2TB (either RAID volumes or large physical disks) have to actually support having the upper 32-bits be non-zero. I strongly suspect that that is in fact true. That is, if you have a controller new enough to support a 3 TB drive, it's accompanying BIOS ROM should support 64-bit LBAs. -- John Baldwin
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