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8 System components and expansions
This chapter describes how to modify your server hardware (e.g. installing or removing boards or
accessible drives). Work steps which are identical for the tower and rack version are only described
for the tower version.
Memory and processor upgrading as well as replacement of the lithium battery are described in the
Technical Manual for the system board.
i
You will find an overview and a brief description of the installed system boards on the side
cover of the server. A detailed description of the system board is provided in the
corresponding Technical Manual.
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Please take note of the safety information in the chapter "Important notes".
8.1 The SCSI hard disk subsystem
The hard disk subsystem is available in an SCSI hot-replace version, consisting of the SCSI
backplane and up to four SCSI hard disk slide-in modules with an SCA (Single Connector
Attachment) interface. With a disk array controller the PRIMERGY B120 server can be expanded to
a high-availability system.
The SCSI hard disk subsystem features Ultra160 SCSI. Standard controllers and disk array
controller can be used as SCSI controllers. With a disk array controller and a corresponding RAID
configuration (Redundant Arrays of Independent Disks), a defective hard disk drive can be replaced
during operation (hot-replace).
When an SCSI hard disk drive is operated in a hot-replace-capable SCSI subsystem on a disk array
controller and is part of a disk array which operates in RAID Level 1 or 5, then it can be replaced in
the case of a defect during operation (hot-replace). To swap a hard disk, you need an SCSI hard
disk drive with the same or higher capacity. You will identify a defective SCSI hard disk drive by a
glowing orange indicator on the hard disk carrier (see "Operation controls"). The reconstruction of
the data (rebuild) on the new hard disk takes place automatically after the swap provided that the
disk array controller has been properly configured. Observe the instructions in the manual of the
disk array controller.
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Only if the orange indicator on the hard disk carrier remains bright may the hard disk be
replaced while the system is in operation.
So that the storage capacity of the hard disk can be recognized at a glance when the hard disk is
replaced, several prefabricated stickers with the storage capacities are provided with the server.
Each hard disk (slide-in module) should bear a sticker indicating its capacity on the front. Should no
suitable sticker be available, blank stickers for labeling are also provided. The stickers are color
coded for easier identification.
The SCSI IDs of the hard disk slide-in modules are permanently set and are assigned from the
bottom upward in the order 0, 1, 2 (with three slide-in modules) or 0, 1, 2, 3 (with four slide-in
modules).