Date: Thu, 11 Jan 2007 19:03:49 -0800 From: Jo Rhett <jrhett@svcolo.com> To: Torfinn Ingolfsen <torfinn.ingolfsen@broadpark.no> Cc: freebsd-stable@freebsd.org Subject: Re: 2.4TB disk - MBR and GPT coexist? Message-ID: <669E8D5D-E286-42DC-800F-24D7DDB2469F@svcolo.com> In-Reply-To: <20070112005510.2e145462.torfinn.ingolfsen@broadpark.no> References: <45A5FD8A.6080409@svcolo.com> <2918081F-D376-410B-B6FD-42BDD3323575@svcolo.com> <20070111213444.GB17185@zone3000.net> <D0D0CE06-B991-4945-B12B-152BA930106B@svcolo.com> <20070112005510.2e145462.torfinn.ingolfsen@broadpark.no>
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> On Thu, 11 Jan 2007 13:56:43 -0800 Jo Rhett <jrhett@svcolo.com> wrote: >> Thanks for the reply. The problem is that I have a single 6-drive >> (550gb/ea) RAID-5 array. If I split two disks off to make a RAID-1 >> boot device, I'll lose 1TB of usable storage. On Jan 11, 2007, at 3:55 PM, Torfinn Ingolfsen wrote: > Hmm, why can't you just make your controller create two logical arrays > onto the one physical array? Doesnt the controller support this > feature? Not any one that I've ever seen in commodity disks. Yes, on big fiber channel disk cabinets. No to 6-8 drive raid controllers. >> Since we're going to be stuck with old BIOSes for a long time after >> 2TB is a cheap disk drive at [store], is anyone considering doing >> the work to make GPT co-exist with an MBR block? It seems like the >> obvious and sensible choice. You boot from the MBR partition, and >> then load the GPT module and access the remaining data after that... > > Is there a reason why we can't have a boot loader that boots off a GPT > disk? Or is the problem with the bios? My understanding is that BIOS expects 32-bit partition sizes. So we must have a 32-bit MBR partition for the BIOS to boot from. I'm just wondering what it will take to make GPT (which in theory can co-exist with MBR) work for the remainder of the drive? -- Jo Rhett senior geek Silicon Valley Colocation
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