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Redundancy in Configurations
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About the Rackmount Disk-Array Processor Enclosure
Redundancy in Configurations
Mirrored storage-system write caching requires:
•
Two SPs with equal memory of at least 128 Mbytes
•
Two power supplies
•
Two LCCs in the DPE and each DAE
•
Disks in slots 0:0 through 0:8
•
SPS (standby power supply) with a fully charged battery
The following table describes the DPE’s high-availability
configurations.
These configurations provide more redundancy, and therefore a
higher degree of system availability. The drive fan packs and SP fan
pack provide redundant cooling for all the configurations listed
above.
0
1
2
3
4
5
6
7
8
9
Database
drives for
LIC
(0 thru 2)
Vault
drives for
caching
(0 thru 8)
DPE Rackmount
Configuration
SPs
LCCs
Power
supplies
Disk
modules
SPSs
Maximum - HA
2
2
2
2
2
2
3 or more
9 or more
0 (no write caching)
2 (high-availability write caching)
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