Intel SRCU31 user manual 5.2.6.1RAID Volume Status, RAID Features, 8.RAID Volume Status

RAID Features

data. A RAID volume may consume all or a portion of the disk capacity available in a system. Multiple RAID volumes can exist on a group of disks in a system. SRCU31 supports up to 15 volumes per channel. A RAID volume is accessible by the host operating system as a physical disk.

5.2.6.1RAID Volume Status

RAID volumes may be in 1 of 6 statuses at any one time. The status of a RAID volume describes its fault tolerance and the integrity of the data it contains. The six types of status are normal, degraded, failed, initializing, rebuilding and migrating. RAID volume statuses are described in Table 5-8.

Table 5-8. RAID Volume Status

RAID Volume Status	Description
Normal	A RAID volume in normal mode has data integrity and a normal degree of fault
	tolerance (single disk failure in most RAID levels).
Failed	A RAID volume in failed mode lacks data integrity and because of this, SRCU31
	blocks access to it.
Degraded	A RAID volume in degraded mode has experienced one or more disk failures,
	however, it still has data integrity. Fault tolerance is compromised or non existent.
	A RAID volume is generating parity. Initialization occurs automatically after the
Initializing	creation of a new RAID 5 volume (RAID 5 volumes only). A percent sign (%) is
	displayed which refers to the percent towards completion.
	A degraded RAID volume is currently rebuilding a failed member disk. There is
Rebuilding	always a value listed after rebuilding which indicates the percentage of
	completion. Upon completion of the rebuild, the volume’s state returns to idle and
	the status returns to normal.
	The RAID volume is being migrated from one RAID configuration to a new RAID
	configuration (RAID level migration). Upon completion of the migration, the
	volume’s state returns to idle. The following activities can cause a migration to
Migrating	take place:
	• RAID level change
	• a strip size change
	• member disks added (array expansion)

Table 5-9. RAID Volume Status and Array Status

Array Status				Volume Status
	Normal	Failed	Migrating1	Degraded1	Uninitialized	Initializing	Rebuilding1
Idle	X	X		RAID Levels	RAID Level
				1, 5	5
Changing
Expanding			X	X
Volume						RAID Level
Initialize						5
Rebuilding				X			RAID Levels
							1, 5
Contracting

1.Indicates that a volume may be migrating and degraded at the same time. If the volume becomes degraded during a migration, then the migration completes, and completes the rebuild.

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