Hitachi Compute Rack CR 210H User Manual page 49

The precautions on use of device tagging are as follows:
To validate the device tagging function, set Chipset > North Bridge >

Device Tagging to Enabled on the system BIOS setup menu.
 T he device tagging operates in independent mode to interleave between

channels.
In case of a correctable memory error, such as a 1-bit error or single DRAM

chip error, automatic correction is continued. At this time, the ERROR LED
does not turned on.
For the device tagging function, only one memory board is used for operation

per channel. If DRAM chips on multiple memory boards in one channel fail,
the device tagging function does not work and the system is shut down.
If an uncorrectable memory error occurs, ECC-based error correction

becomes unavailable and thus the system is shut down.
You cannot use the device tagging function simultaneously with online spare

memory, memory mirroring, and lock step.
Hitachi Compute Rack 210H User's Guide
System Unit Functions 3-27