## Physical drives states

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#### Defunct

The physical hard disk drive is defunct. A drive in the online, hot-spare, or rebuilding state has become defunct. It does not respond to commands, which means that the ServeRAID controller cannot communicate properly with the drive.

A hard disk drive in the defunct state does not necessarily mean that you need to replace the drive. Before you replace the drive, ensure that:

1. All cables are connected correctly to the backplane and to the hard disk drive. Also, check to ensure that all cables inside the server are connected correctly.

2. The hot-swap drive tray is seated properly in the drive bay.

#### Hot spare

A hot-spare drive is a hard disk drive that is defined for automatic use when a similar drive fails. The drive capacity of the hot-spare drive must be equal to or greater than the capacity of the drive being replaced.

Notes: | If you want to have a hot-spare drive or a standby hot-spare drive and also assign RAID level-5 to one of your logical drives, you must have at least four hard disk drives. In the event of a drive failure in an array that contains only logical drives assigned RAID level-0, the ServeRAID controller will not activate a hot-spare drive.

#### Online

The drive is online. It is functioning properly and is part of an array.

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#### Ready

The ServeRAID controller recognizes a ready drive as being available for definition.

#### Rebuilding

The drive is being rebuilt.

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#### Standby

A standby drive is a hard disk drive that has spun down, CD-ROM, tape, removable media, or enclosure.