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Online spare memory
Online spare memory provides a higher level of memory protection than
Advanced ECC ("Advanced ECC memory" on page 97). With online spare
memory, the probability of a server failing because of uncorrectable memory
errors is reduced.
In this mode, degraded memory that is receiving a high rate of correctable
memory errors is automatically disengaged and a replacement set of memory is
used in its place. Because DIMMs that are receiving a high rate of correctable
memory errors have an increased probability of receiving an uncorrectable
memory error (which results in a server failure), the server experiences higher
availability. The degraded memory can be replaced during scheduled downtime
and poses no additional risk to the server.
Online spare memory is supported with one to four memory boards installed. On
this server, each installed memory board is protected by its own spare memory.
No operating system support is required.
The following guidelines apply to online spare memory:
•
All general memory requirements apply.
•
Online spare memory supports 1, 2, 3, or 4 memory boards.
•
Each board must have a valid online spare configuration. No dependencies
exist for the configuration between different memory boards.
•
Each memory board includes its own online spare bank. All boards will
operate in online spare memory mode independently. Each board can
failover to its online spare bank independent of the other memory boards.
Some boards can be in degraded online spare mode while others are still in
operational online spare memory mode.
To end the audio alarms and visual alerts, move the memory board
locking switch back to the locked position. This action does not result in
data corruption or server failure.
If removal of a single memory board is required and it is the only
memory board, power down the server and make the necessary
memory changes.
Memory options
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