28 EMC VNX8000 Hardware Information Guide
System component description
charge relatively quickly. If power remains off for a long period—days or weeks—the DC
battery might require more time to charge fully.
2
The storage processor will not use the
write cache unless it detects at least one fully charged SPS.
A faulted or not fully charged SPS disables the write caching.
Two SPSs for an SPE
The additional SPS in the dual SPS is added for redundancy. When only one SPS is used,
the AC line out connectors for the SPS provide AC voltage to both SP A and SP B.
It is important to cable each SPS so that it connects completely to either the A side or the
B side. For example, if you are looking at the SPSs from the rear, they should be
configured as:
◆ SPS A (rear, right side)—Power-out and sense (management) cables connected to the
SP A power supply.
◆ SPS B (rear, left side)—Power-out and sense (management) cables connected to the
SP B power supply.
Two SPSs for a Vault DAE
The additional SPS in the dual SPS is added for redundancy. When only one SPS is used,
the AC line out connectors for the SPS provide AC voltage to both LCC A and LCC B.
It is important to cable each SPS so that it connects completely to either the A side or the
B side. For example, if you are looking at the SPSs from the rear, they should be
configured as:
◆ SPS A (rear, right side)—Power-out and sense (management) cables connected to the
LCC A power supply.
◆ SPS B (rear, left side)—Power-out and sense (management) cables connected to the
LCC B power supply.
Note: If an SPS is cabled with the SPS sense (management) cable going to the power
supply on LCC A and the power-out cable going to the power supply on LCC B (or vice
versa), an error condition will occur when the SPS is tested or when it is charging.
2. After a full power outage, an SPS typically requires 45 minutes or a maximum of 75 minutes to
charge. To charge the SPS after being off-line usually requires at least 6 hours.
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