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Forum Discussion
Data recovery from inactive volume of ReadyNAS RN104 with four 4TB hard disks RAID-5
Hello,
After replacing a disk on channel-2 with a new one and while resyncing at about 60% of the job I lost contact to my data.
The message on the top of the screen is "Remove inactive volumes in order to use the disk. Disk #1,2,3,4.
As I wrote in the subject there are four(4) disks 4TB each in RAID-5, the model is RN104 and the firmware version is 6.5.1.
Is there any solution to recover data?
Thank you in advance
John
11 Replies
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Sounds like a disk in bay 1, 3 or 4 encountered problems during the resync. You should contact support about this. There would be costs involved with them looking into this. If you could let us know your case number that would be great.
I assume from what you've said that you have no backup?Thank you for your reply.
Yes during the resync another disk in bay 4 encountered problems and changed to FAILED.
And the disk in bay 2 changed immediately from RESYNC to ON-LINE.
And yes again I have no other backup.
I have totally twenty (20) NAS with an average of 10TB each all with four (4) disks and RAID-5.
Should I need 20 more for backup?
I choose the RAID-5 in order to eliminate data loss and after any error message about a disk I am replacing every fault disk with a new one immediately.
Is there any better way for data protection?
Is there any cost estimation of the NETGEAR support in this case?
Thank you again for your support
John
jvozgr wrote:
I have totally twenty (20) NAS with an average of 10TB each all with four (4) disks and RAID-5.
Should I need 20 more for backup?
Up to you of course, but RAID alone isn't enough to keep the data safe. The RAID array can fail, the NAS can fail in a way that corrupts the data, ransomware can corrupt the shares, and of course disasters (theft, fire, flood, lightning) can also cause data loss.
Slightly more general question relating to this....
"Yes during the resync another disk in bay 4 encountered problems and changed to FAILED...."
Given the above, could someone please explain or provide a reference on how RAID5/6/10 on the RN's detect disk failure? Do these NAS boxes auto-detect failed disks prior to data use? I presume these boxes use hardware RAID controllers, but are software configurable?
It appears that the above disk failure(s) were detected only during a resync in the above case, and not pre-detected? Is S.M.A.R.T (for SMART drives ofc) enabled on RN's? for that matter, I thought S.M.A.R.T. was used for detecting failing disks? Or are regular RN disk maintance schedules required to detect failed disks (scrub/balance, etc.)?
When the disk is inserted, a SMART self test is run. You can also schedule SMART disk tests as one of the maintenance functions.
The system does monitor SMART stats, and the drive firmware can the NAS that it has failed. Of course the disk driver can also discover that the drive is not responsive, and at some point will declare the drive to be dead.
The RN104 uses software RAID, but there is hardware acceleration
I think the system does a short SMART test automatically daily and on boot with the option to schedule a longer test or run it from the boot menu.
SMART is useful in detecting problems with disks but it's not perfect. It won't detect every possible problem.
If you download your logs and look in smart_history.log you can see the history of key changes in SMART error counts.
Before replacing a failed disk it's important to check the stats to see how the other disks are going.
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