SDM; the default threshold is 0x500.When Level 1 Sleep is set to Disable, write I/Os to
volumes are not put in a wait status.
• Level 1: This level of control is performed when the sidefile capacity is equal to or larger than
the level-1 threshold, and is smaller than the level-2 threshold.
Write I/Os to volumes are put in a wait status by command retry when the sleep wait threshold
(that is, level-1 threshold) is exceeded.
• Level 2: This level of control is performed when the sidefile capacity is equal to or larger than
the level-2 threshold, and is smaller than the level-3 threshold.
Write I/Os to volumes are put in a wait status by SCP-SCI reporting when the SCP-SCI reporting
threshold (that is, level-2 threshold) is exceeded.
• Level 3: This level of control is performed when the sidefile capacity is equal to or larger than
the level-3 threshold.
Sidefile puncture will occur.
Figure 13 Controlling the Amount of Write Data (2)
When do not block (volume level) option is set to disable 27
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