External Drive online but not recognized
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Things that we need to know to move forward...
- What NAS was this? NAS are not generic and using the term NAS is similar to the term "server." We need specifics as a NAS could be just about anything.
- How did it fail?
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If it was just the drive that was failing , can you get a new drive, let it rebuild the array and then backup the data?
Or is it the NAS unit itself which is failing?
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@Joel said:
@scottalanmiller Thanks Scott...If I plug into a MAC will that work?
No. Plugging into ANY machine will not just work. You should not be removing the drives from the NAS.
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You mentioned that it is RAID 1, unless both drives failed at the same time, you should be able to access the data while the good drive is in the NAS.
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@Joel said:
ork?I heard about Paragon HFS+ - is this possible to use?
I'm not familiar with Paragon, but HFS+ is the native Mac OSX filesystem and not available on any NAS ever put on the market. So anything related to HFS or HFS+ would not be useful here.
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If a drive has failed, the NAS will not be impacted and should be left running intact. The only things you should be doing are taking backups and waiting until the replacement drive arrives. Do not remove any drives or power down the NAS.
If the NAS itself has failed, you need to get your replacement NAS on its way right away and sit tight waiting for that.
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If both drives have failed, then you can purchase and try Spinrite from www.grc.com/spinrite. You will plug the drive into a Windows machine, then boot from the cd you will create from the downloadable ISO. I would start with a level 2 scan. Once it is complete you can put the drive back into the SAN and boot it and try to access that data.
Once you have access you should back it up ASAP to another device.
If Level 2 doesn't give you success, you can try again at level 4, but this will take much much longer to complete.
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We can access data whilst Old NAS is on but its 6 years old and the client (without telling us) ordered a new NAS, plugged in and configured it and then pulled drives out of old NAS (which is a ReadyNas 312) and were trying to copy the data from the old drive across to the new!!!
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If you need for some reason to mount the drive without the NAS (which is not a situation that should ever arise, but...) then there are two things that are needed:
- Something that can access the RAID, see this as a failed RAID 1 and mount the failed RAID array as a block device.
- Only after the above, has the same filesystem as the NAS and can read the contents.
If the drive is good, those two things will allow you to see the contents.
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Your client is a genius
They might have already broken the RAID-1 data on the old drives.
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@Joel said:
We can access data whilst Old NAS is on but its 6 years old and the client (without telling us) ordered a new NAS, plugged in and configured it and then pulled drives out of old NAS (which is a ReadyNas 312) and were trying to copy the data from the old drive across to the new!!!
Then tell them that it is time to restore from backup. They have intentionally thrown their data away it sounds. You would expect the data to be destroyed by that process.
If the old NAS still works, they have to go back to it.
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I feel like I've asked this before, Scott, but why does RAID 1 need to do anything funky at all on the drive?
Assuming that most NASs today run some flavor of Linux, wouldn't they run a Linux compatible format, and therefore be readable in a Linux machine?
I suppose just to make things more difficult, the NAS could use a proprietary file system, or at the mimimum write something to the starting sectors tying it to the NAS to create artificial lock in. Am I missing something?
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Just to add- they didnt plug in the OLD drives into the new Nas box...its completely separate. The new NAS is up and running on the network with new drives...We're left with 2 old NAS hard drives. Shall i tell them to plug it all back to how it was and see if we can view data on the nas?
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@Dashrender said:
I feel like I've asked this before, Scott, but why does RAID 1 need to do anything funky at all on the drive?
Assuming that most NASs today run some flavor of Linux, wouldn't they run a Linux compatible format, and therefore be readable in a Linux machine?
I suppose just to make things more difficult, the NAS could use a proprietary file system, or at the mimimum write something to the starting sectors tying it to the NAS to create artificial lock in. Am I missing something?
Thats what I was thinking - ie if we have a Linux compatible PC (mac) then we can read the data?
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@Breffni-Potter said:
Your client is a genius
They might have already broken the RAID-1 data on the old drives.
Very likely. This process would be expected to destroy the old drives. Possible that it did not, but you have to assume that it did.
This is definitely a moment where you at least have the conversation of "should this client be fired?" I'm not saying that they should, but this is a pretty epic amount of... not talking to their MSP, trying to bypass IT, doing things that are way over their head, taking huge risks with storage of all things, doing things that should get an intern level IT and/or business person fired, etc.
I mean seriously. This is a huge screw up.
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@Dashrender said:
I feel like I've asked this before, Scott, but why does RAID 1 need to do anything funky at all on the drive?
Abstraction. Just like any partitioning or similar. RAID is an abstraction layer. It is not invisible.
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@Joel said:
Thats what I was thinking - ie if we have a Linux compatible PC (mac) then we can read the data?
Yes, since this is a ReadyNAS we can figure out what filesystem it has. If it is quite old, the ReadyNAS were EXT3 and then EXT4. I have that same older model myself (but not where I am at the moment.) How much they have patched it will be a factor.
Any modern Linux system can read the disks from a ReadyNAS. You will need to install something like Mint or Fedora on a desktop and attach it to that and go from there.
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@Joel said:
Just to add- they didnt plug in the OLD drives into the new Nas box...its completely separate. The new NAS is up and running on the network with new drives...We're left with 2 old NAS hard drives. Shall i tell them to plug it all back to how it was and see if we can view data on the nas?
Why did they remove the drives from the NAS then? Just to break it? I'm confused. It sounds like they were doing nothing but breaking the NAS then?
Yes... just put the drives back and get the NAS fixed
Like I said, there is no legitimate process by which NAS drives should be attached to a computer. All good processes involve them remaining in the NAS. -
@Dashrender said:
Assuming that most NASs today run some flavor of Linux, wouldn't they run a Linux compatible format, and therefore be readable in a Linux machine?
Yes, IF you use the RAID layer. You need to mount the abstracted block device before you can get to the filesystem. Since a ReadyNAS thankfully leveraged MD RAID, any Linux system can do this. If they used their own RAID instead of MD, you'd be screwed.
