Thecus Technology N8800 user manual RAID Information, A.R.T. Information

S.M.A.R.T. Information

Item	Description
Tray Number	Tray the hard disk is installed in.
Model	Model name of the installed hard disk.
Power ON Hours	Count of hours in power-on state. The raw value of this attribute
	shows total count of hours (or minutes, or seconds, depending
	on manufacturer) in power-on state.
Temperature Celsius	The current temperature of the hard disk in degrees Celsius
Reallocated Sector	Count of reallocated sectors. When the hard drive finds a
Count	read/write/verification error, it marks this 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. This is why, on a modern hard disks,
	you can not see "bad blocks" while testing the surface - all bad
	blocks are hidden in reallocated sectors. However, the more
	sectors that are reallocated, the more a decrease (up to 10% or
	more) can be noticed in disk read/write speeds.
Current Pending	Current count of unstable sectors (waiting for remapping). The
Sector	raw value of this attribute indicates the total number of sectors
	waiting for remapping. Later, when some of these sectors are
	read successfully, the value is decreased. If errors still occur
	when reading sectors, the hard drive will try to restore the data,
	transfer it to the reserved disk area (spare area), and mark this
	sector as remapped. If this attribute value remains at zero, it
	indicates that the quality of the corresponding surface area is
	low.
Raw Read Error Rate	This attribute value depends on read errors and disk surface
	condition, and indicates the rate of hardware read errors that
	occurred when reading data from a disk surface. Lower values
	indicate that there is a problem with either the disk surface or
	the read/write heads.
Seek Error Rate	Rate of seek errors by the magnetic heads. If there is a failure
	in the mechanical positioning system, servo damage or a
	thermal widening of the hard disk, seek errors arise. More seek
	errors indicates a worsening condition of a disk surface and the
	disk mechanical subsystem.
Back	Press Back to go back to the Disks Information screen.

NOTE

If the Reallocated Sector Count or Current Pending Sector of a hard disk drive is not zero, the status of the disk will show “Warning”. This warning is only used to alert the system administrator that there are bad sectors on the disk, and they should replace those disks as soon as possible.

RAID Information

From the Storage menu, choose the RAID item and the RAID List screen appears.

This screen lists the RAID volumes currently residing on the N8800. From this screen, you can get information about the status of your RAID volumes, as well as the capacities allocated for data, USB target, and iSCSI. There is also a graph which represents how the RAID volume is currently allocated.

To configure your RAID settings, press the RAID Config button to go to the RAID Configuration screen.

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