[linux-lvm] Large disk problem with LVM2...

Greg Varga gvarga at skywaywest.com
Tue Dec 16 11:39:02 UTC 2008

Thanks Bryn for getting back to me.

Here is the information you requested...  I see that it is indeed a 
MSDos partition table... I've done a quite google search, but I can't 
find out how to convert it over to a GPT Partition table...  Can you 
please help me with that or can it even be done (without erasing all the 



[root at bill ~]# fdisk -l /dev/sda

Disk /dev/sda: 3499.8 GB, 3499890573312 bytes
255 heads, 63 sectors/track, 425504 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14       13067   104856255   8e  Linux LVM
/dev/sda3           13068      158155  1165416554+  8e  Linux LVM
[root at bill ~]# parted /dev/sda p

Model: Promise 14+2 Disk RAID6 (scsi)
Disk /dev/sda: 3500GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags
 1      32.3kB  107MB   107MB   primary  ext3         boot
 2      107MB   107GB   107GB   primary               lvm 
 3      107GB   1301GB  1193GB  primary               lvm 

Information: Don't forget to update /etc/fstab, if necessary.            

[root at bill ~]# cat /proc/partitions
major minor  #blocks  name

   8     0 3417861888 sda
   8     1     104391 sda1
   8     2  104856255 sda2
   8     3 1165416554 sda3
 253     0   40960000 dm-0
 253     1   59768832 dm-1
 253     2    4096000 dm-2
 253     3  167772160 dm-3
 253     4  314572800 dm-4
 253     5  524288000 dm-5
 253     6  104857600 dm-6


Bryn M. Reeves wrote:
> Greg Varga wrote:
>> device-mapper: table: device 8:3 too small for target
>> device-mapper: table: 253:7: linear: dm-linear: Device lookup failed
>> device-mapper: ioctl: error adding target to table
> How was the underlying device (sda) partitioned? For a device this 
> large, you'll need to use a GPT partition table, rather than the 
> traditional MSDOS MBR. Some versions of tools may allow you to create 
> large partitions on MSDOS which later cause problems, since the MSDOS 
> format is limited to 2TiB addressing.
> The output of "fdisk -l /dev/sda" and "parted /dev/sda p", as well as 
> the content of /proc/partitions would help to confirm if this is the 
> problem.
>> Anyone have any ideas why pvs shows the DevSize of 1.09TB?
> There have been some cosmetic bugs that caused the wrong device sizes 
> to be reported, but this doesn't look like one of those cases - since 
> you're getting errors from the kernel when mapping LVs onto the
> device, it really does appear that it's not as big as we're expecting.
> Regards,
> Bryn.
Greg Varga
Systems Engineer & Development

Skyway West
  Phone: (604) 482-1128
  Email: gvarga at skywaywest.com
  WebSite: www.skywaywest.com

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