Hitachi Extended Remote Copy for Mainframe user guide (HITA738-96004, June 2008)

Depending on the sidefile capacity, the subsystem will perform one of the following four levels
of control of the amount of write data:
This level of control will be performed when the sidefile capacity is smaller than the
level-1 threshold.
If Level 1 Sleep is set to Enable, write I/Os to logical volumes will be put in a wait status
according to the threshold for the number of recordsets per logical volume; the threshold
is specified by SDM, and the default threshold is 0x500.
If Level 1 Sleep is set to Disable, write I/Os to logical volumes will not be put in a wait
status.
Level 0
This level of control will be 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 logical volumes will be put in a wait status by command retry when the
sleep wait threshold (for example, level-1 threshold) is exceeded.
Level 1
This level of control will be 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 logical volumes will be put in a wait status by SCP-SCI reporting when the
SCP-SCI reporting threshold (for example, level-2 threshold) is exceeded.
Level 2
This level of control will be performed when the sidefile capacity is equal to or larger
than the level-3 threshold.
Sidefile puncture will occur.
Level 3
Figure 15 Controlling the Amount of Write Data (2)
• Level 1 Sleep:
Allows you to specify whether the subsystem should perform “Sleep” -”Wait” command retry when
the sidefile threshold exceeds the sleep wait threshold (for example, the level-1 threshold).
• Enable radio button:
The subsystem will perform “Sleep” -”Wait” command retry.
• Disable radio button:
Hitachi Extended Remote Copy for Mainframe user guide 39