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MaxAttach NAS 6000 Administration Guide
Comparison of Terms
A variety of terms are used to define disks and volumes. One problem exists in that
Microsoft, Mylex, and common terminology use slightly differing definitions of these
terms. The table below summarizes the various terms with additional discussion below.
Table #5 - Comparison of Disk and Array Terms
Microso
ft Term
Folder
File collection on a volume
Partition
Partition: Basic, Simple, Dynamic
When you format a hard drive, you can assign the number of partitions you want on a physical
hard disk. The computer will recognize each partition as a separate drive, and they will show up as
different drives under most operating systems; a logical drive.
Volume
The name given to a disk partition, or group of partitions, that is available to network users as a
single designated drive. A drive may cover several volumes and a volume may span several
physical drives under some operating systems.
Physical Drive A hardware RAID controller's presentation of a disk to the O/S. Identified as standard drive
letters: C:\, D:\, E:\, etc.
A list of physical drives that store one or more logical drives. An array must contain at least one
logical drive although multiple logical drives can be made from within one array. Array types are
RAID 0, RAID 1, RAID 0+1, RAID 5, and JBOD.
The physical disk drives inserted into the MaxAttach NAS 6000 Base or Expansion Unit drive
bays. Each drive is identified by its SCSI Channel and LUN ID. (e.g. drive 0:03 is drive LUN 03 on
SCSI channel 0.)
There are 12 drives per shelf and 36 drives in a fully configured system. Physical naming
convention labels the Base Unit as BU; the first Expansion Unit as EU1, and the second
Expansion Unit as EU2. Drives are identified as 1 to 12 from left to right when viewed from the
front.
Chapter #11 - Appendix - Disk Array RAID Concepts
11/07/01 -- Revision 2.0.03A
Term Definition
268
Chapter #11 - Appendix - Disk Array RAID Concepts
Comparison of Terms
Mylex
Term
Logical Drive
Array of disks
Physical Drive -
SCSI Address
Physical Drive -
Equipment
Shelf and
Physical
Position
000001628
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