Bull DPX/20, Installing And Maintaining

Page: 15 / 69

1–7
Chapter 1. About the storage system
Factory configuration
To make installation simpler, the storage systems are configured at the factory as
follows:
D
The SP SCSI ID is 0.
D
Drives are installed in consecutive slots from the top of the chassis downward.
For example, if the storage system has five drives, they are in the top five slots
(A0, B0, A1, B1, A2).
D
Drive modules are bound into logical units (LUNs) as follows:
Number of drives LUN configuration
3, 4, or 5 All drives bound as one RAID-5 group
6 First five drives bound as one RAID-5 group;
Sixth drive bound as a hot spare
7 First five drives bound as one RAID-5 group;
Sixth and seventh drives bound as one
RAID-1 group
D
Caching enabled with the following parameters:
– Cache memory allocation:
4 Mbytes for system buffers
4 or 28 Mbytes for the read cache, depending on SP memory size
– Variable prefetching enabled for read caching
What next
If you are installing
only one
storage system on a SCSI bus — Continue to Chapter 2.
If you are installing multiple storage systems on a SCSI bus — Continue to Chapter 3.
End of Chapter