HP Store Once 4900 Backup Maintenance and Service Guide

5 The HP p1228 RAID controller
Overview
The HP StoreOnce 4900 Backup system uses the HP p1228 RAID controller fitted with a RAID
cache module and SuperCapacitor. The HP StoreOnce 4900 Backup has two RAID controllers.
Cables connect the external SAS ports on the controller to the SAS storage in the disk enclosure(s).
The RAID cache module is seated on the RAID card and has one port to connect to the
SuperCapacitor (which is located in the center of the unit, clipped to the floor of the chassis behind
the disk cage).
Spares part numbers
Replacement spares part numbers for the p1228 card and SuperCapacitor module are as follows:
• HP p1228 RAID controller: 728099-001
• SuperCapacitor: 660093–001
• Cache module: 633540-001
• External SAS cable: 691973-003
This connects the RAID controller in the head server unit to the SAS disks in the disk enclosure.
The same cable is used if a second disk enclosure is installed (HP StoreOnce 4900 60TB
Capacity Expansion).
Figure 4 HP p1228 RAID card
Cache module2Connector to external SAS storage (Port 2E to drawer
2, Port 1E to drawer 1)
1
SuperCapacitor connector4SuperCapacitor (located in the center of the unit,
clipped to the floor of the chassis behind the disk
cage)
3
LEDs5
16 The HP p1228 RAID controller