3Ware 9550SX-4LP User Manual page 257

•
Rebuild a unit
to replace a degraded drive in a fault tolerant unit (for example, RAID 1,
10, 5, or 50).
•
Redundancy.
protected in the event of a drive failure.
• Remove a drive.
controller.
•
Remove a unit.
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).
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.
self-tests include Upgrade UDMA mode and Check SMART Thresholds.
•
Stagger time.
time, on a particular controller. (9000 series controllers only)
• Stripe size
levels that support striping. The size of stripes can be set for a given unit
during configuration. In general, smaller stripe sizes are better for
sequential I/O, such as video, and larger strip sizes are better for random
I/O (such as databases). The stripe size is user-configurable at 64KB,
128KB, or 256KB.
This stripe size is sometimes referred as a a "minor" stripe size. A major
stripe size is equal to the minor stripe size times the number of disks in the
unit.
•
Striping.
distributing the data amongst two or more drives. Since smaller amounts
of data are written to multiple disk drives simultaneously, this results in
an increase in performance. Striping occurs in RAID 0, 5, 10 and 50.
• Subunit.
example, the mirrored pairs (RAID 1) in a RAID 10 unit are subunits of
the RAID 10 unit.
•
UDMA mode.
133 MB/sec with PATA disk drives and 1.5Gb/sec and 3.0 Gb/sec with
SATA disk drives.
•
Unit ID
• Unit Number
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. To generate data on a new drive after it is put into service
Duplication of data on another drive or drives, so that it is
The process of making a drive unavailable to the
The process of making a unit unavailable to the
A test that can be performed on a scheduled basis. Available
The delay between drive groups that will spin up, at one
. The size of the data written to each disk drive in RAID unit
The process of breaking up files into smaller sizes and
A logical unit of storage that is part of another unit. For
UDMA mode is a protocol that supports bursting data up to
. A unique identifier for a specific unit in a system.
. The SCSI number, or channel number, of a particular unit.
The process of using an existing unit of
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