What does Device: /dev/sda, 15 Offline uncorrectable sectors mean? It's in my error log before my server crashed.
Replace the hard drive. Every modern hard drive keeps extra space available to "remap" bad sectors. This happens magically behind the scenes without you ever knowing about it. Once you've hit "uncorrectable" errors, it means your re-mappable sectors are used up, and that means the drive is on its last legs.
On top of that, now is a good time to review your backup procedures. Think about if the hard drive did crash, would you have been able to recover?
I have made a full complete back of both my server and databasses. If that was a crash I would had lost at least two weeks of data! My hosting company go daddy did a scan disk on the system apparently it's fine.
Not always, a crash can be saved by a scan disk, but not a permanent corruption. When the hard drive integrity fails, it is wise to make sure to have regular backups. These magnetic drives are never predictable.
I started doing backups every time I make files changes! I guess it's the safest thing to do right now!