How to interpret this 'reallocated_sector_ct' warning from SMART?

Hi,
I've got the following SMART information on one of my RAID5 QNAP NAS:
screenshotWhat exactly does it mean and should I immediately replace the disk? Thank you
[update]
There are also these error messages:
ss
XeronimoAsked:
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Wilder_AdminCommented:
Reallocated Sectors Count - Potential indicator of imminent electromechanical failure.

Count of reallocated sectors. When the hard drive finds a read/write/verification error, it marks that sector as "reallocated" and transfers data to a special reserved area (spare area). This process is also known as remapping, and reallocated sectors are called "remaps". The raw value normally represents a count of the bad sectors that have been found and remapped. Thus, the higher the attribute value, the more sectors the drive has had to reallocate. This allows a drive with bad sectors to continue operation; however, a drive which has had any reallocations at all is significantly more likely to fail in the near future.[3] While primarily used as a metric of the life expectancy of the drive, this number also affects performance. As the count of reallocated sectors increases, the read/write speed tends to become worse because the drive head is forced to seek to the reserved area whenever a remap is accessed. If sequential access speed is critical, the remapped sectors can be manually marked as bad blocks in the file system in order to prevent their use.

If you do not have any spare hdd then replace immediately the failing one.
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