1
Redundancy in Configurations
1-19
About the Deskside 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 figures illustrate which disk modules in a deskside
DPE are the database and cache vault drives.
A module designated as database or cache vault drive cannot be configured
as a hot spare
Figure 1-15
Disk Modules in a Deskside DPE
The following table describes the deskside DPE high availability
configurations.
9
8
7
6
5
4
3
2
1
0
14
12
11
10
13
15
19
18
17
16
cache
vault
(DPE)
9
8
7
6
5
4
3
2
1
0
10-Slot Deskside DPE
20-Slot Deskside DPE
Database
drives for
LIC
(0 thru2)
Vault
drives for
caching
(3 thru 8)