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Re: large file system with RAIDframe

On Tue, 16 Mar 2010, 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.

Each disk individually has a sane label:

5 partitions:
#        size    offset     fstype [fsize bsize cpg/sgs]
c: 3907029105        63     unused      0     0        # (Cyl.      0*- 3876020)
d: 3907029168         0     unused      0     0        # (Cyl.      0 - 3876020)
e: 3907029105        63       RAID                     # (Cyl.      0*- 3876020)

Per raidctl(8), I used -C, -c, -I, and -i to initialize things.  The problem 
occurs when I try to label the raid device.  The initial default label shows

#        size    offset     fstype [fsize bsize cpg/sgs]
a: 3519090752         0     4.2BSD      0     0     0  # (Cyl.      0 - 
d: 3519090752         0     unused      0     0        # (Cyl.      0 - 

If I try to create an 'e' partition that's larger, it gets truncated to 
2147483648.  Even the kernel knows that that's not right; I see

raid1: WARNING: raid1: total sector size in disklabel (3519090752) != the size 
of raid (7814058048)

in dmesg.  I found a message from last year 
( about 
similar problems; however, the solution involved wedges on a single, large 
drive.  It is not clear to me how that translates to RAIDframe.

If you want a single filesystem, just newfs the raw partition (raid1d probably in your case). You will need to specify the filesystem size as it will not be able to determine it from the disklabel.


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