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Precautions when replacing cache backup battery
Observe the following guidelines when replacing cache backup battery.
•
When the storage system power is turned off during the replacement,
user data on the cache backup battery that has not been written to disk
is not backed up.
•
Complete the cache backup battery replacement within 10 minutes.
Otherwise, an abnormal rise in temperature can power off the storage
system.
•
On the CBSL/CBSS/CBXSL/CBXSS Controller Boxes, you must turn off
power to the storage system.
•
On the CBL Controller Box, you can replace two cache backup batteries
while the storage system is operating. However, the cache changes to
Write Through mode and read/write performance deteriorates slightly.
With Write Through mode, write operations to the drive and responses
to the host occur as soon as the storage system receives data from the
host computer, and response times to the host computer are delayed.
Therefore, replace the cache backup battery as quickly as possible.
•
When you remove cache backup batteries from the Controller Box, a
Warning condition occurs on the storage system. The Warning status
goes away automatically when the cache backup batteries recover.
-
Cache memory comes in a nickel-hydrogen battery. A closed type
nickel-hydrogen battery can cause an electric shock or explosion if
it is handled wrongly. Observe the following requirements when
handling the battery.
-
Do not disassemble or remake the battery.
-
Do not deform the battery.
-
Do not connect plus and minus poles with a metallic article such as
a wire.
-
Do not reverse the connections of plus and minus poles.
-
Do not peel off the covering tube.
-
Do not connect the battery directly to the outlet.
-
Do not connect the battery to anything other than this array for
charging/discharging.
-
Store the battery in a dark and cool place. Avoid exposure to hot
places.
-
Do not discard a used battery at the site where it was removed for
replacement.
NOTE: If the storage system is turned off longer than six months, the
battery may become discharged excessively. To avoid this condition,
charge the battery for more than three hours every six months.
5–2
Replacing a cache backup battery
Hitachi Unified Storage Hardware Service Guide
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