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Re: large file system with RAIDframe
On Mar 16, 2010, at 5:22 PM, Manuel Bouyer wrote:
> On Tue, Mar 16, 2010 at 01:28:41PM -0400, Steven Bellovin wrote:
>> I'm trying to create a large file system on an amd64/5.x RAID5 system. The
>> RAID device in question is not the root partition. I can't get the
>> disklabel to say anything sane.
>> I have three 2TB disks in a RAID5 configuration. This should, as I
>> understand things, give me 4TB of usable space.
> I think you're hitting disklabel's on-disk format limitations (32bit
> gpt+wedge is the way to go for such large drives.
I mostly suspect you're right, except that the disk label displayed to me had
larger numbers than 2^31 -- I just couldn't enter them.
The question, though, is how wedges interact with RAID. As best I can tell,
there are no wedges on RAID5 "volumes" -- how are partitions assigned, if not
# dkctl raid1 getwedgeinfo
dkctl: /dev/rraid1d: getwedgeinfo: Inappropriate ioctl for device
suggests that I can't do it. (I could, presumably, put wedges on the
underlying volumes, but those seem to be detected correctly.)
--Steve Bellovin, http://www.cs.columbia.edu/~smb
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