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Forum Discussion
Ready NAS104 - Bit rot protection - silent error
I purchased and setup a ReadyNAS 104 10 days ago and set it up with 4x4TB WD Red drives. Its running firmware 6.2.2.
I then copied around 3.5TB of data (mainly media files) from old USB drives to the NAS and everything has been fine until yesterday when I got a slew of warnings (around 80 email alerts) all saying
warning:volume:LOGMSG_BITROT_WARN Bit rot protection has detected a silent error within /path/to/some/media/file on /dev/sda3 and cannot correct the error.
The errors were in two files. I have since replaced these files with equivalents from a different source and run a disk test which reported no errors although I am not sure where to look for results - there were no more warnings and nothing added to the web visible logs other than disk test started, disk test completed. The test took 11 hours approx.
I have downloaded a set of logs after the disk test but am not sure what to look for. The volume.log file says (for all four drives)
Reallocated Sectors: 0
Reallocation Events: 0
Spin Retry Count: 0
Current Pending Sector Count: 0
Uncorrectable Sector Count: 0
but the smart_history.log file has not been updated past the initial first time startup logs on Feb 20th.
Should I be concerned about this? Thanks for any advice.
I then copied around 3.5TB of data (mainly media files) from old USB drives to the NAS and everything has been fine until yesterday when I got a slew of warnings (around 80 email alerts) all saying
warning:volume:LOGMSG_BITROT_WARN Bit rot protection has detected a silent error within /path/to/some/media/file on /dev/sda3 and cannot correct the error.
The errors were in two files. I have since replaced these files with equivalents from a different source and run a disk test which reported no errors although I am not sure where to look for results - there were no more warnings and nothing added to the web visible logs other than disk test started, disk test completed. The test took 11 hours approx.
I have downloaded a set of logs after the disk test but am not sure what to look for. The volume.log file says (for all four drives)
Reallocated Sectors: 0
Reallocation Events: 0
Spin Retry Count: 0
Current Pending Sector Count: 0
Uncorrectable Sector Count: 0
but the smart_history.log file has not been updated past the initial first time startup logs on Feb 20th.
Should I be concerned about this? Thanks for any advice.
12 Replies
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- It looks to me like a timing issue, where perhaps the checksum tree in cache is stale for some transitory period. The kernel in the 6.3.3 release has some improvements in this area, so you may want to give that a spin. But if you can read the data after getting alerts, without receiving an I/O error, that means the data is fine and the checksum mismatch was transitory.
- Thanks. I will ignore these errors for now unless I cannot read the files back after the error or any checksums fail to match. Thanks for the information.
I think I will stay away from the beta firmware for now in case it causes other issues.
As I write this, I am getting a few more warnings from another file in the same folder!
:)
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