Raid resynchronization after replacing NAS 200

Discussion in 'Cisco/Linksys Network Storage Devices' started by phlag, Nov 1, 2009.

  1. phlag

    phlag Addicted to LI Member

    I have got a NAS 200 with 2 samsung disks 1T0 configured in RAID1.

    I had a hardware failure of the NAS 200 ( disks were no more detected) and it has been replaced by Linksys.

    I have put my disks inside the new NAS 200 and power it on ....
    Good news: I found my data back, and all the configuration ( users ...)
    Bad news: the Raid configuration is no more active. When I tried to activate RAID1 option though admin interface, I have got a message telling me that NAS will restore all information to default.... so I decided no to continue....

    Do anybody did a similar operation, what is the best way to do it ?


  2. jac_goudsmit

    jac_goudsmit Super Moderator Staff Member Member

    The following is strictly at your own risk!!!!!. I'm not sure if it works, and if it doesn't, you may lose all your data! If you don't have a backup of the data on the hard disks, now is a good time to research the possibility of getting the data off by starting a Linux live CD on a PC and connecting the hard disk via a USB to SATA adapter or (better) via SATA or eSATA.

    First, check if you can change the configuration without hard disks installed. The NAS200 doesn't support hot-swapping so turn it off by pushing the power button (it will beep) and waiting until the lights are off. Take both drives out and then start it up again. See if you can change the configuration to RAID. Then turn it off again, reinsert both drives and start it up.

    If that doesn't work, turn the unit off and restart with only one drive installed. If it sees the drive, you can copy your data and make the backup that you should have made before your original unit went bad. You can turn the unit off again and add the second drive but because you ran it with one drive first, the mirror is going to be broken and it will have to rebuild which may take a day or so. As soon as you run the system with one drive from a mirror, the mirror will be broken. If you add the second drive, it will be regarded as new (empty) spare drive and all data on that second drive will be overwritten with the new mirror data.

    As you should now see, using RAID is not a guarantee that your data won't get lost. A mirror is not a backup! You should at least consider using a Separate Disk mode setup, and just copy the data from one disk to the other as a form of backup. At least it would have been a lot easier to get your data back if the disks would have been configured as Separate Disks. This and the fact that RAID won't give you any speed advantage, is why I strongly recommend against using RAID in the NAS200.


  3. phlag

    phlag Addicted to LI Member

    Thank you for your help.
    In fact I discover, looking in the forum that my disks - as they were formatted with firmware R62 (journaled fs was the only choice with that firmware)- should be formatted in XFS, and consequently difficult to mount on a windows PC with ext2-IFS.

    So I think I will reformat then with the new release.... in order to be able to read them outside of NAS200 ... in case ...

    I will take advantage of the operation to do some tests before... I will keep you informed..


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