Date: Wed, 8 Jun 2005 21:00:00 +0800 From: Xin LI <delphij@frontfree.net> To: "Raphael H. Becker" <rabe@p-i-n.com> Cc: freebsd-current@freebsd.org Subject: Re: Accessing SCSI-Devices >2TB Message-ID: <20050608130000.GB45279@frontfree.net> In-Reply-To: <20050608122324.C41471@p-i-n.com> References: <20050608122324.C41471@p-i-n.com>
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[-- Attachment #1 --] Hi, Raphael, On Wed, Jun 08, 2005 at 12:23:24PM +0200, Raphael H. Becker wrote: > I tried to attach our new external RAID to my RENEG_5_4 box today using > one logical drive of about 2326GB. > > The RAID was preconfigured with two 50% partitions which were assigned > to two LUNs. FreeBSD 5.4 was able to detect those as da1 and da2 with > full capacity. > > For particular reasons I need one filesystem. > > The support for this RAID told me just SuSE Linux and W2k3/64Bit Systems > are able to access devices >2TB (64bit LBA) therefore the larger RAIDs > are preconfigured with smaller partitions. > > For me there will be 2+1 solutions to get this running, > > a) (preferred): Having one logical drive w/o partitions or multiple LUNs > by doing some magic at my KERNCONF > > b) reverting to 2 Partitions and doing ccd(4) on the resulting /dev/da(1|2) > > ... maybe ... > > c) upgrading to a closer-to-current version to have some "hidden > feature" available? > > Any other solutions? Sure. Actually even RELENG_5_3 has the support with a GENERIC kernel :-) If you want a partition larger than 2TB, then you will want to use gpt(8) instead of fdisk(8). In order to use that, you need to have: options GEOM_GPT In your kernel configuration. 2TB is a hard limit for MBR partitions, but not GPT, as the latter is designed for 64-bit operating system. Fortunately this is also available on FreeBSD/i386 (also amd64 as far as I have tested, and it is supposed to be available on other platforms that FreeBSD supported). Of course I think we should document this somewhere in our handbook, and teach sysinstall(8) about it :-) Cheers, -- Xin LI <delphij frontfree net> http://www.delphij.net/ See complete headers for GPG key and other information. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFCpuvQ/cVsHxFZiIoRAt7sAJ45j2UdFGVxIZYGAIYsT6hPwwdfyACfeOZw fn+PudRMIsqCrVQV6yqDIFs= =9L7z -----END PGP SIGNATURE-----help
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