Broken Raid

Hi guys,

Just want to put all cards down and say that I am definitely a noob on debian.
But I've been using OMV for a few years and I must say is an excellent NAS open source O/S compared to a lot of them our there.

Anyway, one day after rebooting the NAS, O/S wouldn't start.
So I took the liberty and re-installed the O/S with all of the HDD dismounted while reloading the O/S
However, once O/S is back, I'm unable to see any of the RAID.

I've this similar issue last year but was able to bring it all back after reloading this, but this time not having such luck.

Anyway, I've googled around and still stuck with getting the RAID back and now I'm turning to this forum for help and any help to get this back is muchly appreciated!

I'm not sure if this is a good start but here's the output of cat /proc/mdstat
===============================================================================
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md127 : inactive sda[0](S) sdd[3](S) sdc[4](S) sdb[1](S)
7814054240 blocks super 1.2

unused devices: <none>
===============================================================================

Please help. Thanks

Mr Blindguy.
If I'm within a close proximity I might just give you a big smooch!!!
Thank you for this as it worked like a charm! I've been googling nonstop and couldn't believe that it can be fixed with such a simple commands!!!
I cannot thank you enough as you have safe my family photos from being formatted ( as I was that close of doing it)

Anyhoo, I have another question which hopefully will be the last one.

I have just realised that 3 our of the 4 disks were made into RAID 5 and the last one was only a RAID 0.
Just wondering if there's a simple command to mount this?

Cheers

I think i must have not explained myself properly.
I guess what I'm trying to do is just mount that HDD as raid 0 because I had some stuff in it.
I'm not trying to expand or anything, I'm just trying to mount it as is so i can access the files.
But even though GUI recognised the HDD physically, it's unable to mount the volume if I'm making sense?

Hi ryecoaaron,

Here 'tis

root@openmediavault:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [ra id10]

md127 : active raid5 sda[0] sdd[3] sdb[1]
5860538880 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [UU_U]

unused devices: <none>
root@openmediavault:~#

I just checked the total capacity on the GUI and it's 5.46T and I have 4 X 2TB RAID 5.
Based on RAID calc I did, it looks like all 4 HDDs were set on RAID 5. (sorry I'm getting old, my memory tells me that I had 3 on RAID 5 and 1 on RAID 0, so looks like i might have changed it to all 4 HDDs on RAID 5).

according to the GUI the state is degraded.
is there any way to fix this? or do i just have to replace sdc?

Details of the RAID
========================================================
Version : 1.2
Creation Time : Thu Feb 28 16:45:27 2013
Raid Level : raid5
Array Size : 5860538880 (5589.05 GiB 6001.19 GB)
Used Dev Size : 1953512960 (1863.02 GiB 2000.40 GB)
Raid Devices : 4
Total Devices : 3
Persistence : Superblock is persistent

Update Time : Tue Mar 11 22:20:33 2014
State : clean, degraded
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 512K

Name : openmediavault:DATA (local to host openmediavault)
UUID : 7ce3434f:3fa4cb2a:6ebc2837:96aceefc
Events : 114004

Number Major Minor RaidDevice State
0 8 0 0 active sync /dev/sda
1 8 16 1 active sync /dev/sdb
2 0 0 2 removed
3 8 48 3 active sync /dev/sdd

================================================================

Hi All,

I'm a bit further and now that I'm able to mount the old RAID array and I can see it in the GUI
however, under the File Systems I can see /dev/md127 under device and under mount row, it says no.
But if I try to mount it, I get this error

Error #3005:
exception 'OMVException' with message 'The configuration object is not unique: A mount point already exists for the given filesystem' in /var/www/openmediavault/rpc/filesystemmgmt.inc:682
Stack trace:
#0 [internal function]: FileSystemMgmtRpc->mount(Array)
#1 /usr/share/php/openmediavault/rpc.inc(265): call_user_func_array(Array, Array)
#2 /usr/share/php/openmediavault/rpc.inc(98): OMVRpc::exec('FileSystemMgmt', 'mount', Array)
#3 /var/www/openmediavault/rpc.php(44): OMVJsonRpcServer->handle()

Is there anyway to force unmount this and then remount it again properly?

Thanks

Hi David,

yes, I tried that too (after googling around)
and the return was

mount: mount point ext4 does not exist
mount: special device /media/xxxxxxxxxx does not exist

Okay, will do.

On the RAID section however, it says that it's still recovering. Should I wait until it finishes before I do this?

Mate,

You are a freekin' genius!!!
Thanks you are a star!

Lastly, I can see that one of my HDDs is in degraded status, is there a quick way through CLI to confirm which disk that's degraded?

really?
that command only gives me the current RAID and doesn't tell me which HDD is degraded.

md127 : active raid5 sdc[0] sdd[1] sdb[3] sda[4]
5860538880 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [U_UU]
[=>...................] recovery = 5.0% (99339904/1953512960) finish=299 9.2min speed=10303K/sec