Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 311)

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• Redundancy. Duplication of data on another drive or drives, so that it is
protected in the event of a drive failure.
• Remove a drive. The process of making a drive unavailable to the
controller.
• Remove a unit. The process of making a unit unavailable to the
controller and the operating system. After a unit is removed it can be hot
swapped out of the system. This is sometimes referred to as exporting a
unit.
• RLM (RAID Level Migration). The process of using an existing unit of
one or more drives and converting it to a new RAID type without having
to delete the original unit. For example, converting a single disk to a
mirrored disk or converting a RAID 0 unit to a RAID 5 unit.
• Self-test. A test that can be performed on a scheduled basis. Available
self-tests include Check SMART Thresholds.
• Stagger time. The delay between drive groups that will spin up, at one
time, on a particular controller.
• SAS. SAS (Serial Attached SCSI) is a serial communication protocol for
storage devices. The SAS protocol includes support for SAS and SATA
devices.
• SAS address. Each SAS device (SAS drives, controllers, and expanders)
has a worldwide unique 64-bit SAS address. Also known as World Wide
Number (WWN). SATA drives do not have a WWN and are identified by
a VPort ID.
• SAS device. SAS devices include SAS drives, controllers, and any
expanders present in the SAS domain. Each SAS device has a unique 64-
bit World Wide Number (WWN). SATA drives do not have a WWN and
are identified by their VPort IDs
• SAS domain. The SAS domain includes all SAS and SATA devices that
are connected to the 9750 controller, either directly or through expanders.
• SES (SCSI Enclosure Services). The SES protocol allows the 9750
RAID controller to manage and report the state of the power supplies,
cooling devices, displays, indicators, individual drives, and other non-
SCSI elements installed in an enclosure.
• Stripe size . The size of the data written to each disk drive in RAID unit
levels that support striping. The size of stripes can be set for a given unit
during configuration. The stripe size is user-configurable at 64 KB,
128 KB, or 256 KB.
This stripe size is sometimes referred as a “minor” stripe size. A major
stripe size is equal to the minor stripe size times the number of disks in the
unit.