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Failed disk on readynas RN104 JBOD
Hello,
I've a readynas RN104 with 4 disks (3Tb, 1Tb, 2Tb and 1Tb). All of these drives are using the JBOD system to have only one volume. I'm receiving alerts to my e-mail telling me that the 4th drive is about to die with failed sectors.
The total amount of data used is 3.7Tb and so I would like to remove this drive while waiting for buying a new one.
How should I proceed in order to not corrupt my data? I guess that if I remove the sick drive I will loose part of the data or even worse, I might not be able to read any data.
Is the backup of the whole volume the only solution for keeping all my data safe?
Thanks for your help
Ok. This is in fact RAID-0, with a total volume capacity of 7 TB.
This is a very fragile mode - if any disk fails you lose all the data in the volume. Anyone using this mode needs to be very careful about backups.
So you should definitely back up the whole volume right away. I suggest getting a new 3 TB drive, and creating a new XRAID volume. You'll lose a little capacity, but disk replacement will be easier in the future.
And keep your backups up to date.
Caso wrote:
If I remove the sick drive, will I only lose the data of this drive or the whole file system integrity will be corrupted?
As noted above, you lose everything.
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Caso wrote:
Hello,
I've a readynas RN104 with 4 disks (3Tb, 1Tb, 2Tb and 1Tb). All of these drives are using the JBOD system to have only one volume.
JBOD means you have four volumes (one for each drive). Can you confirm that is the case?
Because if you have a single 3.7 TB data volume, then you actually are running XRAID or RAID-5. How you handle the failing disk depends on what mode you are actually using.
If you are running XRAID, then the new disk could be 1 TB or 3 TB. With 3 TB the volume size would grow to 5.4 TB.
Caso wrote:
Is the backup of the whole volume the only solution for keeping all my data safe?
Yes, and I do recommend that you back up at least the critical data now.
Caso wrote:4 disks, using the JBOD system to have only one volume
With Flex-RAID, it's possible to have a single JBOD volume built on several drives. If that's the case, then you're gonna have to clone the drive as JBOD does NOT offer any redundancy (be sure you know what you're doing before attempting anything, you CAN lose it all)
If you're using X-RAID, then you have one disk redundancy.
In any case, you should always have a backup (but yeah, if you have a drive that's starting to fail, it's the right moment to update your backup).
If you have a single JBOD, with 2x1TB + 1x2TB + 1x3TB, the capacity of the volume should be about 6-7TB. If you're running X-RAID, it should be around 4TB.
Can you post a screenshot of your volume config (System / Volumes)?
jak0lantash wrote:
With Flex-RAID, it's possible to have a single JBOD volume built on several drives.No. You can create a RAID-0 array that spans multiple drives, but that is not JBOD. When we say "JBOD" we mean each disk using its own volume.
I think the OP is using XRAID, since he says "3.7 TB volume", which is exactly what he would see using XRAID with the disk sizes he specifies.
Hello,
Here is a screen shot of the volume page (sorry, I 'm French and so the system is in French and I forgot to switch it to English before capturing the screen)
Ok. This is in fact RAID-0, with a total volume capacity of 7 TB.
This is a very fragile mode - if any disk fails you lose all the data in the volume. Anyone using this mode needs to be very careful about backups.
So you should definitely back up the whole volume right away. I suggest getting a new 3 TB drive, and creating a new XRAID volume. You'll lose a little capacity, but disk replacement will be easier in the future.
And keep your backups up to date.
Caso wrote:
If I remove the sick drive, will I only lose the data of this drive or the whole file system integrity will be corrupted?
As noted above, you lose everything.
Hello,
As you can see, I'm not using X-RAID and my 4 disks are gathered into one single volume of about 7Tb.
I was just wondering if there was a way to identify the data stored on the sick disk so that I would have only to make a backup of these files and preserve the integrity of the data spread other the 3 healthy disks.
Do not using any redundancy was a choice I made in order to preserve the maximum capacity and also because my disk configuration was heterogeneous: I bought my ReadyNas system a long time after I bought the disks which were connected with a USB to a old machine working as a data server.
I've already made a backup of the critical data, but it would be a pitty to loose the remaining data just because of one small disk of 1Tb whereas I've so much free space...
If I remove the sick drive, will I only loose the data of this drive or the whole file system integrity will be corrupted?
I'm afraid that the only way will be to run a backup, but I'll have to find more than 3Tb of free space on my computers! :manfrustrated:
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