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Tutor

Jan 14, 2019

ReadyNAS 312: after power outage drives seem empty

Hi. I've had a power outage and when power came back my ReadyNAS 312 was stuck on the "Connecting to the ReadyNAS Admin Page...". I removed the 2 drives and restarted it to go into "safe mode", and...

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Gianlucam

Tutor

Jan 20, 2019

@Sandshark just to be clear, I'd like to add this second drive in a fully reduntant RAID-1 mode.

Gianlucam

Tutor

Jan 20, 2019

I figured out that the "add parity" button doesn't actually add a disk which contains only parity bits, but it creates a redundant RAID-1 disk.

What a poor choice of verbiage for that button, and poor indications of what that button does.
I had to download the software manual and find the "Volume Operations Table" to figure out what that button does.
Very unclear user interface... :(

I'm good now, the second drive is re-syncing.

Thanks,

-Gianluca.

StephenB
Guru - Experienced User
Jan 21, 2019
Gianlucam wrote:

What a poor choice of verbiage for that button

In general it is adding parity - RAID-1 being the only exception to that.

It could be worded as "adding redundancy" - that would be true for all RAID modes.
- Sandshark
  Sensei
  Jan 22, 2019
  I also don't aagree with Netgear's use of "JBOD". In my book "Just a Bunch Of Drives" means each is independently addressable. RAID-0 is all joined together as one with no redundancy. But I don't think Netgear is alone in their interpretation. I doubt whoever first coined the term is going to come forward and say who's right.
  
  But, the end result is "All's good." You did what you wanted, even if it wasn't named as you expected.
  - StephenB
    Guru - Experienced User
    Jan 22, 2019
    Sandshark wrote:
    
    I also don't aagree with Netgear's use of "JBOD". In my book "Just a Bunch Of Drives" means each is independently addressable. RAID-0 is all joined together as one with no redundancy.
    
    I use the term JBOD as you do.
    
    But technically there are two ways to span disks with mdadm/flexraid. RAID-0 will of course to it (with striping, but no parity). But you can create two RAID groups (one for each disk) and concatenate them without striping. Unfortunately that is also commonly called JBOD, though I think a better term for it is "linear RAID".