Jan Schulze wrote:
> Hi all,
> 
> I have a disk array with about 4.5 TB and would like to use it as one lar
> ge
> logical volume with an ext3 file system. When mounting the logical volume
> , I
> get an "Input/Output error: can't read superblock".
> 
> I'm using SL 4.2 with kernel 2.6 and this is what I did so far:
> - used parted to create a gpt disk label (mklabel gpt) and one large
> partition (mkpart primary ext3 0s -1s)
> - used parted to enable LVM flag on device (set 1 LVM on)
> - created one physical volume, one volume group and one logical volume
> (pvcreate /dev/sda1, vgcreate raid6 /dev/sda1, lvcreate -l 1189706 -n vol
> 1
> raid6)
> - created an ext3 filesystem and explicitly specified a 4K blocksize, as
> this should allow a filesystem size of up to 16 TB (mkfs.ext3 -m 0 -b 409
> 6
> /dev/raid6/vol1)
> 
> However, mounting (mount /dev/raid6/vol1 /raid) gives the superblock erro
> r,
> mentioned above.
> 
> Everything is working as expected, when using ext2 filesystem (with LVM)
> or
> ext3 filesystem (without LVM). Using a smaller volume (< 2 TB) is working
> 
> with ext3+LVM as well. Only the combination of > 2TB+ext3+LVM gives me tr
> ouble.
> 
> Any ideas or suggestions?
> 
> Regards,
> Jan


Is there a reason that you are staying at SL 4.2?  If there isn't, I'd suggest 
updating to 4.6.  Although I haven't looked through all the various release 
notes, I believe there are some dealing with fixes in large file systems and LVM.
But ... having no disk systems that big, I really cannot say whether it will 
help or not.

Troy
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Troy Dawson  [log in to unmask]  (630)840-6468
Fermilab  ComputingDivision/LCSI/CSI DSS Group
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