Recreate Raid 0 after OS reinstall

Sorry for repost but I believe I had posted in the wrong forum before.

Hi,I had a system running with 1 HD containing the OS and 4 other HDs in a stripe array (Raid 0, created using the Web GUI) for all my data. The hard drive containing OMV crashed and won't boot up anymore so I installed OMV on another hard drive.

What I want is to be able to get access to my Raid without losing any of the data. Is this possible?

This is the output of blkid:

root@SERVER:~# blkid
/dev/sdc: UUID="fb49fb92-4b63-fb9e-24d2-5e35f7be1076" UUID_SUB="5b10166e-3457-e46e-5488-797a9b07345d" LABEL="SERVER:Server4Stripe" TYPE="linux_raid_member"
/dev/sdd: UUID="fb49fb92-4b63-fb9e-24d2-5e35f7be1076" UUID_SUB="9ec2529f-5639-0650-c7cf-5ad07fde3303" LABEL="SERVER:Server4Stripe" TYPE="linux_raid_member"
/dev/sde: UUID="fb49fb92-4b63-fb9e-24d2-5e35f7be1076" UUID_SUB="b03763ee-6281-3dcd-0649-e1690d853bc6" LABEL="SERVER:Server4Stripe" TYPE="linux_raid_member"
/dev/sda: UUID="fb49fb92-4b63-fb9e-24d2-5e35f7be1076" UUID_SUB="1a950803-9848-26f9-0b77-bb7a5b13594e" LABEL="SERVER:Server4Stripe" TYPE="linux_raid_member"
/dev/sdb1: UUID="66ea7578-41ef-43ce-90cf-19b927b5eeed" TYPE="ext4"
/dev/sdb5: UUID="4bbc90cb-2aa9-4534-b810-abb714000240" TYPE="swap"

but strangely cat /proc/mdstat gives this:

root@SERVER:~# cat /proc/mdstat
Personalities :
unused devices: <none>

Under /dev I can only only see /md and md127, so I tried assembling the md127 array...

root@SERVER:~# cat /proc/mdstat
Personalities :
unused devices: <none>
root@SERVER:~# mdadm --assemble /dev/md127
mdadm: /dev/md127 not identified in config file.
root@SERVER:~# mdadm --assemble /dev/md127 /dev/sdc /dev/sdd /dev/sde /dev/sda
mdadm: failed to add /dev/sde to /dev/md127: Invalid argument
mdadm: failed to add /dev/sdc to /dev/md127: Invalid argument
mdadm: failed to add /dev/sda to /dev/md127: Invalid argument
mdadm: failed to add /dev/sdd to /dev/md127: Invalid argument
mdadm: /dev/md127 assembled from 0 drives - need all 4 to start it (use --run to insist).

Thanks for any help in advance

Quote from ryecoaaron

You have a four drive raid 0 array and you are worried about losing data?? If one drive fails, you lose everything

I like to live dangerously

It was full of movies and TV shows so I'm not too worried about it, but it would save me the week downloading them. I prefer space over stability for this.

In my desperation to try anything and everything I seem to have recreated the array and therefore lost data. Guess I'll just have to redownload everything again, thanks for your help though

I use the PC as a media server running media browser, will unionfilesystems be better than raid 0 for this ?

Alright great! I'll try it out. Out of curiosity, raid 0 would give me more speed right? How much more approximately ?

Thanks for your help ryecoaaron, system is working well and I hope I have done it correctly:

• Quick wiped each disk from the Physical Disk tab.
• Created a file system for each drive and mounted it.
• Created an AUFS of the 4 drives.

Another question I have, if I switch my NAS to another PC will I be able to take all 4 drives along with system drive and connect them to the new PC, the NAS will work as it is now?

ryecoaaron, I am experiencing slow access to my shared folders over SMB/CIFS and videos take way too long to buffer when seeking. It was never like this before, do you think it could be because of using unionfilesystems ?

Just letting you know it's almost impossible to watch anything with AUFS, video needs to buffer again and again after watching a minute or less. Going to switch back to Raid 0 to see if it helps, unless you can guide me on how I can fix it?

Edit: I also shifted the data drives to a better PC (i7 3.0 GHz) with freshly installed OMV and the same thing was happening.

Yes they each use an Ethernet cable. Was actually hoping I could continue using AUFS, easy to add drives and what not. Switched back to raid and no longer facing this issue.

Thanks for all your help!

No I was just browsing into the share through a windows 7 PC and playing it directly with VLC. I think I might have found my issue, it could be the system drive I'm using (a WD green) has slow read/write speeds. Going to backup and restore on another drive to see how it goes.

I tried changing the system drive by using clonezilla, but with the new drive it boots up to 'GRUB _' and is stuck there with the underscore just blinking. Here is what I did:

• Connect new drive and booted up OMV from old drive.
• Install clonezilla and booted up from there.
• Used device-to-device in clonezilla and selected old drive as source and new drive as destination.

It was successful but a message did pop up saying destination drive is smaller than source (although both are 1TB). Any work around or solution on doing it right maybe?

So I found out my Ethernet speed is only 100Mb/sec (I feel like an idiot for overlooking this, no wonder rsync of a network drive to the server was maxing at 12 MB/sec)…that could've been it. Going to try fixing that and see if the problem persists.

As for changing the system drive (this may help someone else in a similar position) I was able to do it by installing a fresh omv onto the new drive and rsyncing a backup I made using the system backup tab on the backup plugin. I did have to fix grub because it was pointing to sdd as my boot drive however that had changed to sdc after rsyncing.