IBM 7378, Руководство по диагностике и обслуживанию

Страница: 252 / 362

v
The maximum memory speed is determined by the combination of the
microprocessor, DIMM speed, and the number of DIMMs installed in each
channel.
v In two-DIMM-per-channel configuration, a server with an Intel Xeon X5600 series
microprocessor automatically operates with a maximum memory speed of up to
1333 MHz when one of the following conditions is met:
– Two 1.5 V single-rank or dual-rank RDIMMs are installed in the same channel.
In the Setup utility, Memory speed is set to Max performance mode
– Two 1.35 V single-rank or dual-ranl RDIMMs are installed in the same
channel. In the Setup utility, Memory speed is set to Max performance and
LV-DIMM power is set to Enhance performance mode. The 1.35 V RDIMMs
will function at 1.5 V
v
Note: The server does not support quad-rank RDIMM.
The server supports a maximum of 16 single-rank or dual-rank RDIMMs. The
server supports up to 12 single-rank or dual-rank UDIMMs.
v
The server supports three single-rank or dual-rank DIMMs per channel on
channel 0 and 1, two single-rank or dual-rank DIMMs on channel 2. The following
table shows an example of the maximum amount of memory that you can install
using ranked DIMMs:
Table 15. Maximum memory installation using ranked DIMMs
Number of DIMMs DIMM type DIMM size Total memory
12 Single-rank UDIMMs 2 GB 24 GB
12 Dual-rank UDIMMs 4 GB 48 GB
16 Single-rank RDIMMs 2 GB 32 GB
16 Dual-rank RDIMMs 2 GB 32 GB
16 Dual-rank RDIMMs 4 GB 64 GB
16 Dual-rank RDIMMs 8 GB 128 GB
v
The RDIMM options that are available for the server are 1 GB, 2 GB, 4 GB, and
8 GB. The server supports a minimum of 1 GB and a maximum of 128 GB of
system memory using RDIMMs.
For 32-bit operating systems only: Some memory is reserved for various
system resources and is unavailable to the operating system. The amount of
memory that is reserved for system resources depends on the operating system,
the configuration of the server, and the configured PCI devices.
v The UDIMM options that are available for the server are 1 GB, 2 GB and 4 GB.
The server supports a minimum of 1 GB and a maximum of 48 GB of system
memory using UDIMMs.
Note: The amount of usable memory is reduced depending on the system
configuration. A certain amount of memory must be reserved for system
resources. To view the total amount of installed memory and the amount of
configured memory, run the Setup utility.
Removing a USB embedded hypervisor flash device
To remove a hypervisor flash device, complete the following steps:
1. Read the safety information that begins on page vii and “Installation guidelines”
on page 149.
234
IBM System x3400 M3 Types 7378 and 7379: Problem Determination and Service Guide