Date: Fri, 07 Apr 2006 13:07:43 -0600 From: Scott Long <scottl@samsco.org> To: Eric Anderson <anderson@centtech.com> Cc: freebsd-fs@freebsd.org Subject: Re: UFS2 with 4TB disk _totally absurd_ Message-ID: <4436B87F.8040004@samsco.org> In-Reply-To: <4436B665.9010200@centtech.com> References: <Pine.LNX.4.21.0604070025110.11218-100000@shell.dhp.com> <4435F4F2.2080301@samsco.org> <4436B665.9010200@centtech.com>
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Eric Anderson wrote: > Scott Long wrote: > >> Ensel Sharon wrote: >> >>>> The FDISK and bsdlabel schemes simply cannot deal with >2TB. You'll >>>> need to either put your filesystem directly on the storage device >>>> without and slices/labels, or use GPT to create logical partitions. >>> >>> >>> >>> 2TB filesystems are _not large_. FreeBSD should expect 2-4TB >>> filesystems >>> to be in common use in peoples _living rooms_, never mind in the >>> office or >>> datacenter. >>> >>> So 5.x was a total wash in terms of UFS2 and snapshots, largefiles, >>> etc., >>> 6.0 still doesn't have working filesystem quotas or snapshots, and it >>> seems, doesn't support modern (circa 2004) hard drives. >>> >>> Maybe a little less time working on FreeBSD 23.0 ... ? >>> >> >> What are you talking about? UFS2, the filesystem, supports storage >> volumes up to 2^63 blocks in size, and filesystems themselves of >> more than 2^53 blocks in size. There is no 2TB limit in UFS2, and I've >> personally created filesystems that are indeed much larger than that.. >> These sizes were supported in 2004, and they are supported in 2006. >> What is limited is the FDISK and BSDLABEL formats, which were designed >> in the early 80's to handle up to 2^32 blocks. Neither of these prevent >> you from creating a large filesystem. Maybe you're looking to have a >> single large volume to hold both your boot filesystem and your data >> filesystem? That's generally a bad idea since it puts more things into >> the path of a failure. Try doing what most people do, which is to boot >> off of a 2 disk mirror (go big and get 500GB disks if you want) and have >> your data on a separate array that is more redundant and doesn't need to >> use the above partition formats. >> >> Alternatively, find a PC that understands how to boot off of GPT >> partitions, and use that format. It's not FreeBSD's fault that the PC >> BIOS uses the FDISK format. Go complain to IBM and Microsoft for not >> having the foresight to future-proof their partition format 25 years >> ago. > > > Now if only fsck could be fixed to actually be able to fsck a full >2TB > filesystem with a reasonable amount of memory, without swapping forever. > Even with journaling, you still need to be able to run fsck in case of > very hard errors. > > > Eric > > > Yup, that's a problem. It's on my TODO list. Scott
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