IBM Power Systems 775 Manual page 322

Figure 5-3 QCM0 to QCM1 move
If a failure occurs in the GPFS QCM1, QCM1 is moved to QCM2 and QCM1 is defined as a
compute QCM again and resides in the defective A+ resource region, as shown in Figure 5-4
on page 309.
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IBM Power Systems 775 for AIX and Linux HPC Solution