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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.

 

 

 

To define a hot-spare disk, WebPAM, the management utility of the card,

 

 

 

must be installed.

 

 

 

 

 

 

Check

 

 

 

 

 

For standby rebuild, or rebuild using hot-spare disks, see "Chapter 3

 

 

 

 

 

 

Features of Disk Array Controller."

 

 

 

 

 

 

Tips

 

 

 

 

 

 

 

"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.

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NEC N8103-89 manual Hot-Spare Disk, Free disk