Trying to mount 13 Tb disk on RedHat system.

[Sanjay Chakraborty]

As you mention that fdisk can see only 2TB. Then make that as LVM
partiton (do pvcreate) and then run partprobe and now fdisk should see
again next 2TB. Do the same for next.... until all the disk are
consume and then add them in one LVM.

Hope it will help.

On Thu, Aug 13, 2009 at 4:10 PM, Margaret Doll<Margaret_Doll at brown.edu> wrote:
> We got to create the 13 Tb partition on the  aux  disk on the RedHat system
> by using parted, but then mkfs.ext3 doesn't work on any partition larger
> than 2 Tb.
>
> If we split the aux disk into 2 Tb partitions, I understand from
> http://www.linuxnix.com/2009/04/logical-volume-manager-lvm-in-redhat.html
> that we use fdisk to  change the partition type to  83 Linux LVM.
>  Unfortunately fdisk will only see the first 2 Tb partition, so we can't
> create a LVM
> of the partitions.
>
> We went back to parted and created one 13 Tb partition.  Then inside
>  parted, we used
>
> mkfs 0 ext3
>
> The program said  that ext3  was not supported in this version of parted,
> but ext2 was.  I oked, ext2.
> Inside parted
>
> (parted) print
>
> Model: IFT A16F-G2430 (scsi)
> Disk /dev/sdc: 13.0TB
> Sector size (logical/physical): 512B/512B
> Partition Table: gpt
>
> Number  Start   End     Size    File system  Name     Flags
>  1      17.4kB  13.0TB  13.0TB  ext3         primary
>
> the partition is  labeled as a ext3 file system.
>
> Our 13 Tb partition was added to /etc/fstab as a ext3  filesystem and
> mounted on  the system.
>
> "df -h" though lists it as a 1.8 Tb system.
>
> /dev/sdc1             1.8T  196M  1.7T   1% /m3team
>
> How  can we monitor the space used on the 13 Tb disk assuming that it is
> mounted correctly?
> How  do we tell if it is mounted correctly?
>
>
>
> On Aug 12, 2009, at 6:02 PM, sigpedag wrote:
>
>> Margaret Doll a écrit :
>>>
>>> We are trying to use a 13 Tb disk on one of the latest RedHat system;
>>> namely, 2.6.18-128.4.1.el5xen.
>>> "ext3" cannot see beyond 2 Tb.
>>
>> ext3 can manage 16TiB filesystems, but some tools (like "fdisk") can only
>> deal with 2TiB.
>>
>> You can use GPT partitions and "parted" instead of "fdisk" like Margaret
>> suggests.
>>
>> If you want to use standard tools, just split your 13TiB storage into 2TiB
>> pieces and "glue" them with LVM, this is how I use a +3TiB storage.
>>
>> - If the storage is seen like a single disk by the system, create 2TiB
>> partitions with fdisk and change the type for "8E" (LVM), then add this
>> partitions to LVM with "pvcreate /dev/sdX1 /dev/sdX2 /dev/sdX3 ..."
>>
>> - If you can, create 2TiB LUNs, and use them directly in LVM, this is much
>> simpler, you don't have any partition to make : "pvcreate /dev/sdX /dev/sdY
>> /dev/sdZ ..."
>>
>> After that, create a LV with the LVM devices and then create a LV in the
>> VG and then you can do a "mkfs.ext3" on the 13TiB LVM device.
>>
>> Nicolas
>>
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-- 
Regards.
Sanjay Chakraborty