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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...
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,
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.
Thank you very much for your answer Stephen.
Now I know that running a backup is mandatory because I have no chance to keep my data...
I will think about changing the RAID configuration to avoid this kind of problem in the future.
Well, RAID0 and JBOD are not exactly the same thing, expect for the absence of redundancy.
RAID0 is better for performance but relies on same capacity on all the HDDs.
JBOD doesn't bring any increase in performance but doesn't care about mixed capacities as it simply aggregate all HDDs.
If you want to save your JBOD, you could shutdown the NAS, clone the dying drive onto another one and reboot the NAS with the 3 original HDDs + the clone. That should work.
Of course, it's preferable to make a full backup first. But if it does work, you don't need to restore all the data again.
If you clone the dying HDD onto a bigger HDD, it souldn't cause any issue for the volume itself, as the JBOD will be assembled with the clone of the original partition. But I do NOT know if you'll be able to "expand" your volume by using the unused capacity on that bigger HDD. If you do attempt this, please share here your result so people will know ;)
jak0lantash wrote:
Well, RAID0 and JBOD are not exactly the same thing, expect for the absence of redundancy.
Last time I checked, JBOD meant somewhat different things in different contexts.
More to the point here, I think the OP was unaware on how fragile his setup is. The failing disk could be cloned (with the NAS powered down), but I think its better for him if he switches to XRAID.
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