Date: Fri, 12 Jan 2007 14:50:35 +1100 From: "Jan Mikkelsen" <janm@transactionware.com> To: "Jo Rhett" <jrhett@svcolo.com> Cc: freebsd-stable@freebsd.org Subject: Re: 2.4TB disk - MBR and GPT coexist? Message-ID: <000901c735fc$d180ac10$3301a8c0@janmxp> 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> <669E8D5D-E286-42DC-800F-24D7DDB2469F@svcolo.com>
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Hi, Jo Rhett wrote: >> 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. I'd be very surprised if you can't. You can certainly do it with Areca (arcmsr(4)), HP (ciss(4)), IBM ServeRAID (ips(4)), although the details vary. For example, on an Areca 8 port controller, I have 8 disks in a RAID-6 array, and within that "RAID set", I have three volumes. The three volumes appear to FreeBSD as da0, da1 and da2, respectively. CLI> rsf info Num Name Disks TotalCap FreeCap DiskChannels State =============================================================================== 1 Raid Set # 00 8 2560.0GB 0.0GB 12345678 Rebuilding =============================================================================== GuiErrMsg<0x00>: Success. CLI> vsf info # Name Raid# Level Capacity Ch/Id/Lun State =============================================================================== 1 ARC-1220-VOL#00 1 Raid6 81.0GB 00/00/00 Rebuilding(63.8%) 2 ARC-1220-VOL#01 1 Raid6 1000.0GB 00/01/00 Need Rebuild 3 ARC-1220-VOL#02 1 Raid6 839.0GB 00/02/00 Need Rebuild =============================================================================== GuiErrMsg<0x00>: Success. Regards, Jan Mikkelsen
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