3Ware 9650SE-2LPB-10 User Manual page 259

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• 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. 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 "minor" stripe size. A major
stripe size is equal to the minor stripe size times the number of disks in the
unit.
• The process of breaking up files into smaller sizes and
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.
• A logical unit of storage that is part of another unit. For
Subunit.
example, the mirrored pairs (RAID 1) in a RAID 10 unit are subunits of
the RAID 10 unit.
• UDMA mode is a protocol that supports bursting data up to
UDMA mode.
133 MB/sec with PATA disk drives and 1.5Gb/sec and 3.0 Gb/sec with
SATA disk drives.
• Unit ID . A unique identifier for a specific unit in a system.
• . The SCSI number, or channel number, of a particular unit.
Unit Number
• . A logical unit of storage, which the operating system treats as a
Unit
single drive. A unit may consist of a single drive or several drives. Also
known as an array.
• . A process that confirms the validity of the redundant data in a
Verify
redundant unit. For a RAID 1 and RAID 10 unit, a verify will compare the
data of one mirror with the other. For RAID 5 and RAID 50, a verify will
calculate RAID 5 parity and compare it to what is written on the disk
drive.
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