Fujitsu B120 manual System components and expansions, The SCSI hard disk subsystem

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.

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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.

Please take note of the safety information in the chapter "Important notes".

8.1The 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.

!	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).

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