Installation Conditions and Installation Rules
This section describes the installation conditions and standard installation rules for the following optional
products.
•
System memory
•
Host interface
•
Drive enclosure
•
Drive
System Memory
This section explains the installation conditions and installation rules for system memory modules.
The ETERNUS AF650 S3 are the target ETERNUS AF storage systems.
■
Types of System Memory Modules
The following types of system memory modules are available:
•
768GB (64GB
´
6
´
2CM)
•
1,536GB (128GB
´
6
´
2CM)
■
Number of Installable System Memory Modules
In the ETERNUS AF650 S3, six system memory modules can be installed for each controller and 12 system
memory modules can be installed for each storage system.
■
Policies for Estimating System Memory
Since the total capacity of data that is to be handled increases in proportion to the total capacity of the drives
that are accessed, more system memory needs to be installed when additional capacity for drives is installed. If
the system memory capacity is insufficient, data is read from the drives and performance is reduced because
data cannot be read from the system memory (cache miss).
The following section shows the basic capacity of the system memory based on the drive capacity (*1).
*1:
Use the total capacity of the drives that are accessed during operation for the drive capacity.
When work is separated by time, such as between daytime and nighttime, system memory capacity can be calculated by using the task
that requires the most capacity from the drives that are accessed.
It can also be calculated by using the drive capacity for tasks that place a priority on response time.
●
Basic Capacity of the System Memory
The required capacity for system memory is calculated according to the drive capacity of the access target.
●
ETERNUS AF650 S3
Table 66
Estimated System Memory Capacity of Each Storage System (ETERNUS AF650 S3 with the
Deduplication/Compression Function Disabled)
Drive capacity
System memory capacity (with the Deduplication/Compression function disabled)
Up to 358,399GB
768GB
358,400GB or more 1,536GB
4. Hardware Configurations
Installation Conditions and Installation Rules
174
Design Guide
Summary of Contents for ETERNUS AF S3 Series
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