I am running RAID-1 on Asustor NAS (which runs Linux inside).
Recently I got many sector reading errors on the second disk while the first disk is reported 100% free of errors. The error reports were produced when I accessed some files, then I made a full scan of each disk to see that disk 1 is free of errors and disk 2 has 200 damaged sectors.
Now, what is Really STRANGE for me - when I read some files stored on this RAID, I get errors even though one of the disks has no errors! How comes? Is not RAID in this case supposed to be able to read the data from the not-damaged sectors of the first disk and then even write them back to the second disk restoring the health of my system? How can it be technically possible?
Thanks, Yigal
Recently I got many sector reading errors on the second disk while the first disk is reported 100% free of errors. The error reports were produced when I accessed some files, then I made a full scan of each disk to see that disk 1 is free of errors and disk 2 has 200 damaged sectors.
Now, what is Really STRANGE for me - when I read some files stored on this RAID, I get errors even though one of the disks has no errors! How comes? Is not RAID in this case supposed to be able to read the data from the not-damaged sectors of the first disk and then even write them back to the second disk restoring the health of my system? How can it be technically possible?
Thanks, Yigal