IBM p5 550 Technical Overview And Introduction

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26 p5-550 Technical Overview and Introduction2.6 Internal serial portsThe serial ports S1 and S2, at the rear of the system, are only available if the system is notmanaged using a Hardware Management Console (HMC). In this case, the S1 and S2 portssupport the attachment of serial console and modem.If an HMC is connected, a virtual serial console is provided by the HMC (logical device vsa0under AIX) and also a modem can be connected to the HMC. The S1 and S2 ports are notusable in this case.If additional serial port functionality is needed, optional PCI adapters are available (PCI 8-portadapter FC 2943 or PCI 128-port adapter FC 2944).2.7 Internal storageThere is one dual channel Ultra320 SCSI controller managed by the EADS-X chips,integrated into the system planar, that is used to drive the internal disk drives. The eightinternal drives plug into the disk drive backplane, which has two separate SCSI buses withfour disk drives per bus.The internal disk drive can be used in two different modes based on whether the SCSI RAIDEnablement Card (FC 5709) is installed (see 2.7.3, “RAID options” on page 27).The p5-550 supports a split 8-pack disk drive backplane that is designed for hot-pluggabledisk drives. The disk drive backplane docks directly to the system planar. The virtual SCSIEnclosure Services (VSES) hot-plug control functions are provided by the Ultra320 SCSIcontrollers.2.7.1 Internal media devicesThe p5-550 provides two slim-line media bays for an optional DVD-ROM (FC 2640) andoptional DVD-RAM (FC 5751), and one media bay for a tape drive. These features aresummarized in Table 2-3.Table 2-3 Available tape drives2.7.2 Internal hot swappable SCSI disksThe p5-550 can have up to eight hot-swappable disk drives plugged in the two 4-pack diskdrives backplanes. The hot-swap process is controlled by the SCSI enclosure service (SES),which is located in the 4-pack disk drives backplane (AIX assigns the name ses0 to the first4-pack, and ses1 to the second, if present). The two hot-swappable 4-pack disk drivesbackplanes can accommodate the devices listed in Table 2-4.Feature code Description6258 4-mm 36/72 GB tape (LVD)6134 8-mm 60/150 GB tape (LVD)6120 VXA 80/160 GB tape (LVD)