RAID-5 Problems with 3.5" HDD (Seagate), no problems with 2.5" ???

Hello,

I'm freaking out.

No problem with 3 2.5" (Seagate 500GB) hdds on my Asrock H87M PRO 4 and building a raid-5. Now I wanted to upgrade and deleted the 2.5" raid. Installed 3 3.5" hdds (Seagate 3TB) and I can build the raid but can't build the filesystem afterwards. After buildung the raid automatically a new filesystem (EXT4) is created which can't be mounted. This does not happen when building the raid-5 with the 2.5" hdds. I have to manually build a filesystem and mount it. Abolutely perfect but no chance with my 3.5" hdds.

Right now I'm building a new RAID-5 with 3x3TB 3.5" hdds but there already is a "ghost filesystem" (see attached file).

What could be the problem? And maybe you have an idea for a solution ;-))

Thanks a lot in advance for your help.

Just found a similar problem here:

cant mount newly created RAID5 Array

worked for me too.

Should I test something or should be everything be OK now?

Why do I have to:

dd if=/dev/zero of=/dev/md0 bs=512 count=10000
mkfs.ext4 /dev/md0

after this mounting via GUI did the job?

Is this a bug of OMV with my hardware?

dumpe2fs -h /dev/md0 shows:

root@OMV-INTEL:~# dumpe2fs -h /dev/md0
dumpe2fs 1.42.5 (29-Jul-2012)
Filesystem volume name: <none>
Last mounted on: /media/2602c91a-b241-40c7-87a1-3aadbe2155e7
Filesystem UUID: 2602c91a-b241-40c7-87a1-3aadbe2155e7
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags: signed_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 183136256
Block count: 1465067520
Reserved block count: 73253376
Free blocks: 1453476758
Free inodes: 183136245
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 674
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 4096
Inode blocks per group: 256
RAID stride: 128
RAID stripe width: 256
Flex block group size: 16
Filesystem created: Sat Feb 20 17:24:20 2016
Last mount time: Sat Feb 20 17:27:46 2016
Last write time: Sat Feb 20 17:27:46 2016
Mount count: 2
Maximum mount count: -1
Last checked: Sat Feb 20 17:24:20 2016
Check interval: 0 (<none>)
Lifetime writes: 253 MB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 28
Desired extra isize: 28
Journal inode: 8
Default directory hash: half_md4
Directory Hash Seed: 60b5699f-37d4-4acd-a06e-4ea572cee67b
Journal backup: inode blocks
Jounaleigenschaften: (none)
Journalgrösse: 128M
Journal-Länge: 32768
Journal-Sequenz: 0x00000013
Journal-Start: 1