Apple Xserve G5 - Manual (Page 75)

Xserve G5 Troubleshooting - 1 General Information
General Information
What’s New
Hot-Pluggable Serial ATA Drives
Xserve G5 includes three hard drive bays at the front of the server; Xserve G5 (Cluster
Node) includes just one hard drive. Both versions support hot-pluggable Apple serial ATA
(SATA) drive modules.
In the Xserve G5 server, drive bays are numbered 1–3, beginning with the far left bay. The
bay in which a drive is installed determines its master/slave position, thereby eliminating
the need for jumpers or special drive configuration. The drive installed in bay 1 is the
master drive and should have the operating system installed on it.
In both models, you can replace or install hard drives while the server is running; you do
not need to shut down or open the server first. A status light on the front of each drive
indicates when it is safe to remove the drive without losing data. For more information, see
“Hard Drive” in the Take Apart chapter.
DDR Memory
The server’s logic board includes eight memory slots, arranged in two banks. The slots
accept error-correcting Double-Data-Rate (DDR) Synchronous Dynamic Random-Access
Memory (SDRAM) devices. Memory can be expanded to a maximum of 8 gigabytes.
DIMMs used in Xserve G5 must fit these specifications:
• PC3200 error-correcting DDR SDRAM, also known as DDR-400
• 2.5 volt
• 64-bit wide, 184-pin module
• 18 memory devices maximum
• Unbuffered (not registered or buffered)
• Maximum height of 1.25 inches
For more information, see “DIMMs” in the Take Apart chapter.
Important: DIMMs must always be installed in pairs of equal size, from the center
outward. Memory from older Macintosh computers is not compatible with Xserve G5. Do
not use older memory, even if it fits into the DIMM slots.