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13 Power management for arrays

and network relay devices

This appendix explains power management for arrays and network relay devices during remote copy

operations. In particular, this appendix discusses the following:

• What happens when power is removed from arrays or network relay devices due to an

unexpected reason (see When power is removed due to an unexpected reason)

• What should be noted when you intentionally power off arrays or network relay devices (see

When intentionally turning power off)

The term “network relay devices” refers to hardware used for connecting primary and secondary arrays,

such as ESCON® directors, channel extenders, and switches.

When power i

s removed due to an unexpected reason

This sectio

n explains what happens when power is removed from arrays or network relay devices due to

an unexpected reason.

When power is removed from primary arrays

If power is removed from the primary array during remote copy operations, the primary array assumes

a failure occurred, and splits all data volume pairs. If the primary array splits data volume pairs, the

secondary array also assumes a failure occurred, and splits all data volume pairs.

If power is removed from the primary or secondary array and its backup batteries are fully discharged

while data volume pairs are split, differential data (that is, update data) is not retained. In this unlikely

case, the primary or secondary array assumes all suspended data volumes are updated. If you restore

data volume pairs at the primary site, all primary data volumes are copied to the secondary data volumes.

When power is removed from secondary arrays

If power

is removed from the secondary array during remote copy operations, the secondary array

assumes

a failure occurred, and splits all data volume pairs. If the secondary array splits data volume

pairs, the primary array also assumes a failure occurred, and splits all data volume pairs.

If power is removed from the primary or secondary array and its backup batteries are fully discharged

while data volume pairs are split, differential data (that is, update data) is not retained. In this unlikely

case, t

he primary or secondary array assumes all suspended data volumes are updated. If you restore

data volume pairs at the primary site, all primary data volumes are copied to the secondary data volumes.

When power is removed from network relay devices

If power is removed from a network relay device during remote copy operations, the primary and

secondary arrays assume a failure occurred, and split all data volume pairs.

When intentionally turning power off

This section explains what you should note when you intentionally power off arrays or network relay

devices.

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