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Forum Discussion
Replaced drive, but second drive failed during resync (NV+ v2)
Hi all, managed to get myself into a bad situation. I have a ReadyNAS NV+ v2, with four 2TB drives in it. I decided to purchase four new 4TB drives to increase my storage space. I pulled out old d...
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I don't have a lot of exp[erience messing around under the hood on OS5.x. On other OS's, a volume created external to the GUI will be recognized by the GUI if the proper entry is in /etc/fstab. So, if the recreation works at all, I would think that getting the GUI to recognize it should not be too difficult. The underlined text being the key, of course.
I ended up getting _really_ lucky.
I tried putting back in old drive #1, but unfortunately the system treated it as a new drive and started resync.
I was of course assuming that resync would fail part-way through, since drive #2 still had damaged sectors. So, while drive #1 was resyncing, I did a `dd` of drive #2, ignoring errors, so I could see a list of bad sectors in the kernel log. I was incredibly lucky: looks like there was only actually one bad sector. I used `dd` again to force a write of the entire bad sector, which forced the disk to reallocate the sector to spare space. Yes, that caused me to lose 4k of data, but the resync of old drive #1 finished successfully.
I then did a full fsck and set of SMART checks, and then started replacing again, this time starting with drive #2. After a few days, all four drives were replaced, and the NAS expanded the partition to account for the extra space.
So, as I said, I got incredibly lucky.
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