On Sat, 06 Sep 2014 23:09:28 +0200 "azurIt" <azurit@pobox.sk> wrote:

> Hi,
> 
> i'm having problems with growing my RAID0 array over 2 TB. I installed two 4 TB drives, created 4 TB partitions but array cannot be resized over 2 TB. Superblock versoin is 0.90 and kernel version is 3.2.53 - according to linux RAID wiki, it should support 4 TB component/array size:
> https://raid.wiki.kernel.org/index.php/RAID_superblock_formats#The_version-0.90_Superblock_Format
> 
> Some more info:
> 
> # mdadm --detail /dev/md2
> /dev/md2:
>         Version : 0.90
>   Creation Time : Tue Sep 28 16:54:04 2010
>      Raid Level : raid1
>      Array Size : 2147483520 (2048.00 GiB 2199.02 GB)
>   Used Dev Size : 2147483520 (2048.00 GiB 2199.02 GB)
>    Raid Devices : 2
>   Total Devices : 2
> Preferred Minor : 2
>     Persistence : Superblock is persistent
> 
>     Update Time : Sat Sep  6 23:04:44 2014
>           State : clean 
>  Active Devices : 2
> Working Devices : 2
>  Failed Devices : 0
>   Spare Devices : 0
> 
>            UUID : 9a363004:ad04abfe:2e31e1c3:caf66df4
>          Events : 0.77066
> 
>     Number   Major   Minor   RaidDevice State
>        0       8       33        0      active sync   /dev/sdc1
>        1       8       49        1      active sync   /dev/sdd1
> 
> 
> 
> 
> 
> 
> 
> # fdisk /dev/sdd
> 
> WARNING: GPT (GUID Partition Table) detected on '/dev/sdd'! The util fdisk doesn't support GPT. Use GNU Parted.

Why are you using "fdisk" even though "fdisk" is telling you not to use it?

What does
  cat /proc/partitions

say about the sizes of the partitions?

NeilBrown