DUO, Flex-RAID 0, Replace disk 1

[shaggys]

Hi
I got 2 disks and running Flex-RAID 0. The first disk (C) is giving up on me and alot of SMART errors are in the log.

If I wanna replace the disk can I do this?

* Copy all data to a windows machine with a externa USB disk
* Shut down the DUO
* Pull out and replace disk 1
* Start the DUO up
* Copy back the data from the external drive.

Will the DUO allow me to do this or do the DISK 1 contain system files for the DUO to work properly?

regards

Lasse

[mdgm-ntgr]

shaggys wrote:
* Copy all data to a windows machine with a externa USB disk

Yes.

shaggys wrote:
* Shut down the DUO

Don't think you need to do this. In fact I'd recommend leaving the NAS on, well at least have NAS on when adding replacement disk.

shaggys wrote:
* Pull out and replace disk 1 * Start the DUO up * Copy back the data from the external drive.

I think that should work.

shaggys wrote:
Will the DUO allow me to do this or do the DISK 1 contain system files for the DUO to work properly?

The OS partition would be RAID-1 so it would be mirrored on disk 2.

[shaggys]

Thanks for the reply.
I do not use ANY raid at all.
Got 2 disks a' 1Tb, so I got 2 Tb of storage. No mirror, no nothing.....

U still agree on the last action?`

//Lasse

[mdgm-ntgr]

I know that. I was talking about the OS (Operating System) partition being RAID-1 not the data volume.

Here's some info I get from my Duo v2 running Flex-RAID

root@MARM-NAS:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] 
md3 : active raid0 sdb3[0]
      1948792880 blocks super 1.2 16k chunks
      
md2 : active raid0 sda3[0]
      1948792832 blocks super 1.2 64k chunks
      
md1 : active raid1 sda2[0] sdb2[1]
      524276 blocks super 1.2 [2/2] [UU]
      
md0 : active raid1 sda1[0] sdb1[2]
      4193268 blocks super 1.2 [2/2] [UU]

As you can see the OS partition (/dev/md0) and the swap (/dev/md1) are raid-1 (mirrored across the two disks). The data volumes C (/dev/md2) and D (/dev/md3) are RAID-0 (i.e. no redundancy).


The Duo v1 though a very different product to the v2 would also have a redundant OS partition (in the Duo's case 2GB). So if you replace a disk the OS partition will be synced onto the replacement.

[shaggys]

Very interesting. I did not know that. I guess I have to try. If it doesn't work, I just pull it out again and duplicate the old disk onto the new using a windows application.

Thanks for the info

Mine looks like this, so it should work -:)

NASEN:~# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid5] [raid4]
md2 : active raid0 hdc3[0]
974182016 blocks 16k chunks

md3 : active raid0 hde3[0]
974180288 blocks 16k chunks

md1 : active raid1 hdc2[0] hde2[1]
524224 blocks [2/2] [UU]

md0 : active raid1 hde1[1] hdc1[0]
2047936 blocks [2/2] [UU]



//Lasse