Verifying Backup Success & Optionally Accessing Backup Disk2

Discussion in 'Cisco/Linksys Network Storage Devices' started by smcfarlane, Oct 21, 2006.

  1. smcfarlane

    smcfarlane LI Guru Member


    Probably a dumb question but I'm a little stumped. I've been using the NSLU2 for quite a while with one external 250GB drive (Maxtor One Touch USB/Firewire). Recently I had an "event" whereby I lost a LOT of folders full of ripped music without understanding why/how ... they just seemed to disappear. Subsequent scandisks failed. I copied what data remained to local disk on my laptop and Mac Mini and reformatted the Maxtor then copied the data back and started re-ripping all the music I lost. I also decided it was time to add another disk and start backing up the files. I added another external 250GB drive (Western Digital 250GB USB/Firewire). I initially had trouble getting the NSLU2 to recognize the new drive in DISK2 port. I had to swap drives between ports before the unit would recognize the new WD drive. No problem. The new drive is now DISK1 and I formatted as EXT3 and copied all files from DISK2 (was originally DISK1) to DISK1 and then set up a DISK-to-DISK backup. At this point I lost all shares to DISK2 (the original Maxtor from DISK1). The backups are working it seems. But given that I lost whole directories I'm a little sceptical. How do I ensure that DISK2 is really getting a complete backup of DISK1 and if ever I lose data in DISK1 I can retrieve it from DISK2. I don't seem to be able to set up any shares for DISK2. How do you a) access DISK2 when auto-backup is enabled?

    Here's my current status:

    Server Name: xxxx
    Version: V2.3R63
    IP Address:
    USB Port 1: Ready, 234497MB (87% Free)
    USB Port 2: Ready, 235378MB (87% Free)

    Thanks for any insights offered. Cheers
  2. success2be

    success2be LI Guru Member

    I think the reason you can't share Disk 2 is everything from Disk 1 is copied to Disk 2. If Linksys did let you share Disk 2, and you started changing Disk 2, then Disk 2 wouldn't be a backup of Disk 1 as things would start to differ.

    bring up the admin page on your browser from your NSLU2 e.g. or what ever your NSLU2's IP address is. Click on Administration -> Status -> View Log

    You can also dettach the USB drive and connect it to your computer. If you have linux or MacOS, then you can enter the command "md5sum /dev/sda", wait for the command to give you a calculated md5sum, connect the backup drive, and run the same command. Then compare the two md5sum generated. If they match, then they're the same. I think it'll work for two drives of same brand and model.

    Your command "md5sum /dev/sda" may be different if you already have other SCSI or USB drives already attached. So it could be "md5sum /dev/sdb", etc.
  3. smcfarlane

    smcfarlane LI Guru Member

    Thanks a bunch for the info ....

    Has anyone worked out a strategy for accessing the backup disk for retrieving and restoring deleted files back to disk1 .... besides disconnecting either drive or disabling the backup? Just curious. Thanks in advance.
  4. d__l

    d__l Network Guru Member

    I think the only way to use Disk 2 after you have made it a backup disk is to physically change its connector to USB Port 1 and then read-acccess it from there.

    The other way to access it would be to install an ext2 system driver on your WinXP system such as and access it from XP.
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