CentOS - Sep 2013 - Creating 38TB ext4 FS

mkfs.ext4 fails to create 38TB file system on CentOS 6.4 64bit with this
error:

mkfs.ext4: Size of device /dev/vg02/vtapes too big to be expressed in 32
bits
        using a blocksize of 4096.

More details follow:

# uname -a
Linux tzbackup 2.6.32-358.18.1.el6.x86_64 #1 SMP Wed Aug 28 17:19:38 UTC
2013 x86_64 x86_64 x86_64 GNU/Linux

# fdisk -l /dev/sdc

Disk /dev/sdc: 41996.7 GB, 41996727091200 bytes
255 heads, 63 sectors/track, 5105811 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


# pvdisplay /dev/sdc
  --- Physical volume ---
  PV Name               /dev/sdc
  VG Name               vg02
  PV Size               38.20 TiB / not usable 4.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              10012799
  Free PE               0
  Allocated PE          10012799
  PV UUID               qGIgYy-Q8N2-xUjM-58Zb-uEnu-qFNY-NGjkhx

# vgdisplay /dev/vg02
  --- Volume group ---
  VG Name               vg02
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               38.20 TiB
  PE Size               4.00 MiB
  Total PE              10012799
  Alloc PE / Size       10012799 / 38.20 TiB
  Free  PE / Size       0 / 0
  VG UUID               T1jUYU-wBTG-u0aN-AtYV-iFf8-S6Hw-zMuacu

# lvdisplay /dev/vg02/vtapes
  --- Logical volume ---
  LV Path                /dev/vg02/vtapes
  LV Name                vtapes
  VG Name                vg02
  LV UUID                6cktBz-ayFL-5XVp-kVEp-4giU-A1Kc-Jjf2UV
  LV Write Access        read/write
  LV Creation host, time tzbackup, 2013-09-20 13:29:30 -0700
  LV Status              available
  # open                 0
  LV Size                38.20 TiB
  Current LE             10012799
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:8

# mkfs.ext4 -b 4096 /dev/vg02/vtapes
mke2fs 1.41.12 (17-May-2010)
mkfs.ext4: Size of device /dev/vg02/vtapes too big to be expressed in 32
bits
        using a blocksize of 4096.


Any idea?

Thanks,

-- Peter

On 20.09.2013 21:58, Peter Wood wrote:
> mkfs.ext4 fails to create 38TB file system on CentOS 6.4 64bit with 
> this
> error:
> 
> mkfs.ext4: Size of device /dev/vg02/vtapes too big to be expressed in 
> 32
> bits
>         using a blocksize of 4096.
> 
EXT4 filesystems are limited (on RHEL) to 16TB. You should be using XFS 
for such large volumes.

-- 
Sent from the Delta quadrant using Borg technology!

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