Emerson ATCA-S201 manual  Understanding the Hardware RAID status table, Wwid

	RTM-ATCA-SXXX Overview
Hardware RAID	Description
configuration
Section 1 — Create RAID	List of remaining disks available for new RAID volume definition.
volumes	Click to select disk members.
	Click to select RAID level
	Click create Volume
	Upon completion, the physical disk view will change to display the new
	Virtual RAID volume while its disk members become hidden.
Section 2 —RAID Status	Provides a detailed status of existing RAID volumes, and details regarding
Summary	the “hidden” disk members.
	Click “delete” to erase this volume and return all of the member disks to the
	pool of available disks.
Section 3 — Allocate Hot Spare	List of disks available for new global hot spare. The ATCA-S201 will use a
	global hot spare to repair a RAID1 or RAID1E volume that is degraded.
Section 4- Hot spare status	Provides a detailed status of existing global hot spares. Click “delete” to
	return a spare disk to the pool of available disks.

Understanding the Hardware RAID status table page

Once the RAID volume is created, the individual disks comprising a RAID disk are “hidden” from the OS and physical disk view, but are shown in the RAID status table.

Parameter	Description
Volume	The ATCA blade is label string identifies the RAID volume.
Bus/Target	Identifies the SCSI parameters used to address the virtual RAID device
Type	Identifies the RAID level employed by the virtual RAID device. (Raid0,
	Raid1, or Raid1E)
WWID	The World-Wide Identification, is an eight byte SAS address that
	uniquely identifies the virtual RAID volume.
State	Optimal — The RAID volume and all comprising disk members are fully
	operational
	Degraded - The RAID volume is accessible for read/write operation,
	but one of its underlying disk members is offline.
	Failed - the RAID volume is not accessible for read/write operations.
	Data loss may have occurred.
Status	Enabled (default) — The RAID volume is able to receive I/O commands
	Offline — The RAID volume cannot receive I/O
Size	The usable capacity, (MB) of the Virtual RAID drive.
Stripe Size	The maximum chunk of data that is written to one disk of a RAID
	group. The stripe width = Stripe size * number of disks. The ATCA-
	S201 currently applies a fixed size of 64 KB.

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