Memory

Use this window to view information about the memory arrays installed in your system.

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Tab Subtab User Privileges
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Main System Chassis
Memory Properties Memory  U, P, A NA

U=User; P=Power User; A=Administrator; NA=Not Applicable. For more details on user privilege levels, see "Privilege Levels in the Server Administrator GUI."

Random-access memory (RAM) is the system's primary storage area for program instructions and data. Each location in RAM is identified by a number called a memory address. For that reason your system must have addressable memory available to it when performing tasks. Any information stored in RAM is lost when you turn off your system.

The Memory window displays information about the following:

Redundant Memory

Attributes

Total Attributes

Connector Details of Memory Array <n>

Details for a Particular Memory Device

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Redundant Memory

NOTE: Server Administrator supports this feature only if the managed server supports redundant memory. 

Redundant memory enables a server to switch to different memory modules if unacceptable errors are detected in the modules it is currently using. Server Administrator supports two redundant memory modes: spare bank and mirror. You can enable or disable redundant memory and specify which mode to use when enabled. Systems may support one or both redundant memory modes.

Spare bank mode disables a bank of system memory in which a single-bit ECC error is detected, enables the spare bank, and copies all the data from the original bank to the spare bank. Spare requires at least three banks of identical memory; the operating system does not recognize the spare bank.

Mirror mode switches to using a redundant copy of memory when a multibit error is detected. After accessing mirrored memory, the system does not switch back to using the original system memory until the next reboot. The operating system does not recognize half of the installed system memory in this mode. 

Redundancy Status Indicates the health of the current redundant memory mode. Values are Full, Degraded, and Lost.

Full indicates that a device may fail but the system will remain functional. This status is reported if the spare bank or mirror is enabled but not in active use and all DIMMs have an OK status.

Degraded indicates that the system is redundant, but a component within the redundant group has failed. This status is reported if the spare bank or mirror is enabled but not in active use and one or more DIMMs has a non-OK status.

Lost indicates that the system is not redundant, and that an additional device failure will result in a system failure. This status is reported if the spare bank or mirror is enabled and is in active use.

Fail Over State Indicates if the spare bank or mirror is currently in use. Values are Active and Inactive.

Active indicates that the spare bank or mirror is in use.

Inactive indicates that the spare bank or mirror is not in use.

If Fail Over State is Active, Redundancy Status is Lost.

Redundancy Configuration Allows selection of the desired redundant memory mode, or disable redundant memory.

Disabled

Disables redundant memory.

SpareBank

Configures spare bank mode, which becomes the selected mode after the next reboot.

Mirror

Configures mirror mode, which becomes the selected mode after the next reboot.

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Attributes of Memory Array(s)

This menu displays fields and values for a particular memory array that is installed on your system. Memory attributes include fields describing the maximum capacity versus the actual installed RAM of the system at a given point in time. Attributes and fields are listed for each memory array installed in the system.

Location Place where memory array resides, for example, on the system board, or in an expansion card such as Industry Standard Architecture (ISA), Extended ISA (EISA), or Peripheral Component Interconnect (PCI), NUBUS, or various types of PC-98 expansion cards.
Use Function to which this memory array is dedicated; for example, system memory, video memory, flash memory, nonvolatile RAM, or cache.
Installed Capacity Amount of RAM that is presently installed in the system.
Maximum Capacity Maximum RAM capacity of the system when all available sockets are occupied.
Slots Available Total number of slots available in this memory array.
Slots Used Actual number of slots that are populated with memory modules in this array.
ECC Type Identifies the ECC type that this memory can perform. For example, parity, single-bit, multibit, cyclic redundancy checking (CRC).

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Total of Memory Array(s)

This menu includes fields for actual installed memory, the amount of installed memory that is available to the operating system, and the maximum memory capacity if all memory slots are occupied.

Total Installed Capacity Total memory actually installed in the entire system.
Total Installed Capacity Available to the OS Total memory installed and available to the operating system.
Total Maximum Capacity Total memory that can be installed in the entire system when all memory slots are occupied.

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Details of Memory Array <n>

This menu provides details about a specific memory array.

Status Normal, prefailure, or failure performance of the memory module.
Connector Name The alphanumeric text that uniquely identifies each memory slot, whether occupied or unoccupied.
Type Synchronous dynamic random access memory (SDRAM) chips operate fast enough to synchronize with the CPU clock, eliminating wait states. The SDRAM chip set has two cell blocks, allowing more efficient data access. In dynamic random access memory (DRAM) each bit of storage is built from a single transistor and capacitor, allowing more memory bits to fit in the same chip set area. However, DRAM has to be refreshed because the charge on the capacitor, which represents the stored bit value, decays with time. During a refresh, the memory module must read every bit and write it back at full strength.
Size Capacity of the memory slot, expressed in MB.

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