102
The xSeries 255 contains 10 standard bays with the option of adding an additional six HDD bays. The six standard slim-line hot-swap HDD bays are located on the
upper left half of the front of both tower and rack models. Four removable media bays are located on the right-side front of the chassis. The top bay contains the
standard floppy disk drive and the second bay from the top contains the standard CD-ROM drive. The remaining two removable media bays support tape or optical
drive options.
The standard Ultra320 hot-swap backplane supports six hot-swap HDD bays. The backplane is connected to the integrated dual-channel, Ultra160 SCSI controller
through a standard 16-bit LVD SCSI cable. If internal RAID support is required, this cable can be used to connect the backplane to a supported RAID controller. A
second optional hot-swap backplane with six hot-swap HDD bays is supported for installation directly below the standard backplane. The optional backplane can
be configured as an independent SCSI bus with the addition of an optional SCSI storage controller or it can be configured with the six standard hot-swap HDD bays
by connecting each of the hot-swap backplanes to separate connectors of a two- or four-channel RAID controller. The optional backplane cannot be connected to
the integrated SCSI controller if the standard backplane remains connected, and there is no accommodation for connecting the two backplanes directly.
Supported internal tape drives include a 34-inch terminated SCSI cable for connecting optional tape drives to either a supported SCSI controller or to channel A of
the integrated SCSi controller if the hot-swap backplane is connected to an optional controller. The standard CD-ROM is cabled to the IDE port on the planar through
a two-drop IDE cable.
External attachment of supported SCSI devices requires installation of the optional External SCSI Interface Kit (P/N 32P8164), which provides a SCSI cable with an
external 0.8mm VHDCI connector that attaches to the rear of the chassis and connects at the other end to the 68-pin connector of channel B on the planar.
For additional information regarding internal cabling, refer to Appendix F: Internal Cabling Overview.
Total Memory
1
Quantity of RDIMMs Added
2
512MB
(2 x 256MB models)
1GB
(2 x 512MB models)
256MB
(P/N 33L3281)
512MB
(P/N 33L3283)
1GB
(P/N 33L3285)
1GB
standard
2
-
-
2GB
-
6
-
-
-
2GB
-
2
-
3GB
-
10
-
-
-
3GB
4
2
-
4GB
-
6
4
-
-
4GB
8
2
-
5GB
-
2
8
-
-
5GB
4
6
-
-
6GB
-
2
4
7GB
-
2
4
4
-
7GB
4
2
4
-
8GB
-
6
4
9GB
-
2
-
8
10GB
3
-
-
4
8
-
10GB
-
2
8
12GB
3
12GB
3
-
-
12
This table does not represent all possible memory configurations. Four-way interleaving is assumed for the
purposes of this table. Memory modules may vary in price per MB. Selection of smaller RDIMMs may provide
a more cost-effective alternative to using larger RDIMMs.
1. Network operating systems may limit the maximum amount of addressable memory. See operating system
specifications for further information.
2. To obtain the Quantity of memory identified in the “Total Memory” column, select the appropriate row and
order the quantity of RDIMMs identified in all columns for that row.
3. Requires removal of standard RDIMMs.
xSeries 255 Internal SCSI Cabling
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