Using this ReadyNAS with two drives inside it in a Mac system. It's exhibiting problems showing up on Raidar, etc. It finally booted up and I get this warning on Raidar:I need to understand if this means that one of the two drives is dead. I don't know for sure if this was set up as RAID level 0 or 1. Is that obvious from the error info on the Raidar page? I can't interpret it and I'm not very technical, but I understand the basic concepts. At the moment with what I know, I'm thinking that if I power down the chassis (correctly of course) and remove the left side drive, the system will work for now with the one healthy drive.But this is based on two assumptions I'm making.1. This set up is configured as RAID level 1, meaning it's fully redundant and pulling a drive and rebooting is safe.2. The error message is telling me that the left drive is not functioning (dead) and the right drive is working and healthy (-ish) Am I correct? Is there a way to verify which Raid level this is running? (since I have it up for now?) Any help much appreciated. Please explain steps and locations in plain language if possible. I really dont' hack.

You already asked the RAID question on another thread. XRAID with two disks uses RAID-1. Disks are numbered left-to-right, so you are correct in thinking that the error is with the leftmost disk. I'd log into the actual admin web ui using https://nas-ip-address/admin (substituting the actual NAS IP address), and also look in it's logs to see what's going on with disk 1. You can download the log zip file from the logs page, and look in disk_info.log and smart_history.log. That will also give you a more precise idea on what's failed. You can post back questions (and cut/pastes from those logs) if you aren't sure what they are telling you. To replace the disk, you remove the disk, and take it out of the drive tray. Put the new disk into the drive tray, and then insert it into the NAS. Do all this with the NAS running. The replacement drive is normally the same size as the failed disk (though it could be bigger if you are planning to expand the NAS later on). NAS-purposed drives (WDC Red or Seagate Ironwolf) are good choices for your ultra. It's always a good idea to make a backup first.

Thanks for the help. I'm unable to back up the drives because even though the array has successfully mounted to the desktop occasionally, it doesn't function for read or write. It just beachballs when I try to access any files. I pulled the left drive out while the nas was running, as you suggested. I was hoping the remaining drive would mount, but it doesn't. If It could mount, I would back up the contents. Instead, I suppose I'll buy a replacement drive for the dead one. I'll look for documentation on how to join the new drive with the existing one in a RAID 1 level set up. Thanks

I'm buying a Seagate 2TB IronWolf NAS SATA 6Gb/s NCQ 64MB Cache 3.5" Internal Hard Drive to replace the bad drive. Just wondering, is it possible that the single drive in the chassis can mount on my desktop temporarily until I add the new replacement for the dead drive? I tried mounting it but it doesn't. I'm leaving the nas powered up because I'm afraid to power it down with only one drive in it. Also, will the new drive already be formatted? If not, will the chassis do that when I install the drive? Thanks. Sorry for the questions. I just want to work.

The new drive will be blank, an dthe NAS will take care of partitioning and formatting it. You could mount the drive in a linux system (with BTRFS installed), bu not on a PC running windows.

Got the new drive and I basically just hot swapped it for the dead drive (on the left in the chassis). I left it running overnight and as of this morning, the Readynas doesn't seem to be doing anything with the new drive I installed. I use the app that launches (a recently downloaded "Raidar" download. See image in my first post in this message stream). The info in the window is identical and hasn't changed. Still says the left drive is dead and isn't recognizing the new drive. Anything I can do about this? Thank you.

need help understanding RAID level x2

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StephenB
Guru - Experienced User
Dec 12, 2017
You already asked the RAID question on another thread. XRAID with two disks uses RAID-1. Disks are numbered left-to-right, so you are correct in thinking that the error is with the leftmost disk.

I'd log into the actual admin web ui using https://nas-ip-address/admin (substituting the actual NAS IP address), and also look in it's logs to see what's going on with disk 1. You can download the log zip file from the logs page, and look in disk_info.log and smart_history.log. That will also give you a more precise idea on what's failed. You can post back questions (and cut/pastes from those logs) if you aren't sure what they are telling you.

To replace the disk, you remove the disk, and take it out of the drive tray. Put the new disk into the drive tray, and then insert it into the NAS. Do all this with the NAS running.

The replacement drive is normally the same size as the failed disk (though it could be bigger if you are planning to expand the NAS later on). NAS-purposed drives (WDC Red or Seagate Ironwolf) are good choices for your ultra.

It's always a good idea to make a backup first.
- DS327
  Aspirant
  Dec 12, 2017
  Thanks for the help. I'm unable to back up the drives because even though the array has successfully mounted to the desktop occasionally, it doesn't function for read or write. It just beachballs when I try to access any files.
  
  I pulled the left drive out while the nas was running, as you suggested. I was hoping the remaining drive would mount, but it doesn't. If It could mount, I would back up the contents.
  
  Instead, I suppose I'll buy a replacement drive for the dead one. I'll look for documentation on how to join the new drive with the existing one in a RAID 1 level set up.
  
  Thanks
  - DS327
    Aspirant
    Dec 12, 2017
    I'm buying a Seagate 2TB IronWolf NAS SATA 6Gb/s NCQ 64MB Cache 3.5" Internal Hard Drive to replace the bad drive.
    
    Just wondering, is it possible that the single drive in the chassis can mount on my desktop temporarily until I add the new replacement for the dead drive? I tried mounting it but it doesn't. I'm leaving the nas powered up because I'm afraid to power it down with only one drive in it.
    
    Also, will the new drive already be formatted? If not, will the chassis do that when I install the drive?
    
    Thanks. Sorry for the questions. I just want to work.

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need help understanding RAID level x2

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