Date: Mon, 17 Nov 2014 12:58:48 +0100 From: Borja Marcos <borjam@sarenet.es> To: "freebsd-fs@FreeBSD.org Filesystems" <freebsd-fs@freebsd.org> Subject: BIOS booting from disks > 2TB Message-ID: <9A929629-2EA9-47FB-A8A8-1874BB0283A5@sarenet.es>
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Hi I've been trying to install FreeBSD on a 3TB disk attached to a Proliant = Microserver G8. The system is unable to boot, complaining about an error with the GPT backup table. = I don't have the machine here now, but I can reproduce this evening if someone really needs to see the = actual messages. The machine doesn't have UEFI, it can just boot via BIOS, and I = understand that the reading of the backup table is failing because the BIOS can just use 32 bits to specify a sector = number. Would it be possible to "fix" the boot process so that, if the following = conditions apply, that check is omitted? - Boot using BIOS, not UEFI - bits(disk size) > 32 What would be the side effects? Of course we can't assume it will be = safe to boot from a ZFS pool with devices larger than 2TB, as there is no guarantee that all the blocks it = needs to read are within the 2 TB limit.=20 But it should be safe to, at least, boot from a UFS partition contained = below the 2 TB limit. Any thoughts? Borja.
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