NEC Disk Array Controller N8103-89 - Manual (Page 91)

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1-6. Hot-Spare Disk
The hot-spare disk is prepared as an auxiliary HDD substituting for a defected HDD
included in a logical drive which is configured at a redundant RAID level. Detecting a HDD
fault, the system disconnects the HDD (or makes it offline) and starts rebuild using the
hot-spare disk. The hot-spare disk can be set in two types as listed in the table below.
Setting Feature
Global Spare Available as a hot-spare disk if a HDD in any logical drive is
defected. The disk of the type can accept media patrol.
Dedicated Spare Available as a hot-spare disk only if a HDD in the specified logical
disk is defected. The disk of the type can accept media patrol.
Check
To define a hot-spare disk, WebPAM, the management utility of the card,
must be installed.
Tips
For standby rebuild, or rebuild using hot-spare disks, see "Chapter 3
Features of Disk Array Controller."
"Free" disk
A "free" disk (unconfigured disk not assigned to a logical drive and hot-spare disk) can
substitute for defected HDD in the similar way as a global spare. In the configuration
including both hot-spare and "free" disks, the hot-spare disks are used preferentially.
However, "free" disks cannot be subject to media patrol. Thus it is recommended to define
"free" disks as hot-spare disks.