symbios logic J21971S-0398, Руководство по установке

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Technical Specifications
Software Features
Revision A, March 1998 Technical Reference 51
Software Features
This command module supports SYMplicity Storage Manager
software, an application used to configure and manage disk arrays.
SYMplicity Storage Manager provides configuration tools that allow
you to define the physical and logical space on each drive in
preparation for data storage. Whether or not you need to configure
the command module depends on several factors, such as:
●
How many drives are attached to the command module
●
How and where the command module is connected to the SCSI
bus
●
What type of host, host adapter, and operating system you are
using with the command module
●
What type of RAID management software you are using on the
command module
●
Whether or not you want to use the factory default
configuration settings (number of LUNs, RAID level, hot spare
drives, etc.)
Table 4 lists a few of the default software parameters that may or may
not be set at the factory prior to shipment. Before you attempt to store
data on the drive units, you should use SYMplicity Storage Manager
or the appropriate software to determine the following:
●
Exactly how the drives and command modules are currently
configured
●
Whether or not you want to change that configuration
Table 4 Sample Disk Array Software Parameter Settings
NOTE Depending on the RAID management software you use, the
command module may be referred to as a disk array, a RAID
module, or other type of unit. Keep this in mind when using the
RAID software.
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RAID Level
Defines how data is stored on the logical units (LUNs) and whether or not there is data
redundancy, based on a RAID level. There are four RAID levels: 0, 1, 3, and 5.
Drive Group Defines which physical drives make up each logical unit.
Caching
Determines whether data will be stored in cache memory. This is specified on a logical unit
basis.
Segment Size
Defines the amount of data (segment size) a controller will write to a single drive in a
logical unit, before writing data to the next drive. Segment sizes are determined by the total
number of data blocks.
Reconstruction Rate
Determines the total number of data blocks the controller will reconstruct during one
reconstruction operation. Defines the amount of time (delay interval) between each
reconstruction operation.