Storage Management Overview
45
NAS 2000s Administration Guide
Storage Elements Overview
Note:
Each fully populated HP StorageWorks 4300/4400 Family storage enclosure supports up to
14 hard drives.
Preliminary physical storage management tasks involve managing:
■
Physical Hard Drives
■
Arrays
■
Logical Drives (LUNs)
Drive array concepts and data protection methods, including fault tolerance options are
discussed in this section. This information will help guide decisions on how to best configure
the arrays.
Physical Hard Drives
For personal or small business use, the capacity and performance of a single hard drive is
adequate. However, larger businesses demand higher storage capacities, higher data transfer
rates, and greater security from data loss if drives fail.
Merely adding extra drives to the system increases the total storage capacity, but has little
effect on the system efficiency, because data can only be transferred to one hard drive at a time.
illustrates the read/write process with separate physical hard drives.
Figure 20: Separate physical drive (P1, P2, P3) read/write (R/W) operations
Arrays
With an array controller installed in the system, the capacity of several physical drives can be
logically combined into one or more logical units called arrays. When this is done, the
read/write heads of all the constituent physical drives are active simultaneously, dramatically
reducing the overall time required for data transfer.
R/W
P1
P2
P3
Summary of Contents for 345646-001 - StorageWorks NAS 2000s External Storage Server
Page 16: ...About this Guide 16 NAS 2000s Administration Guide ...
Page 56: ...Storage Management Overview 56 NAS 2000s Administration Guide ...
Page 80: ...Disk Management 80 NAS 2000s Administration Guide ...
Page 110: ...User and Group Management 110 NAS 2000s Administration Guide ...
Page 146: ...Folder Printer and Share Management 146 NAS 2000s Administration Guide ...
Page 186: ...NetWare File System Management 186 NAS 2000s Administration Guide ...