Silicon Graphics Origin200, Owner'S Manual

Page: 41 / 288

Internal Drive Options and SCSI Channels
15
Note the following about installing DIMMs in an Origin200 module:
• DIMMs are installed in pairs, with one pair per bank.
• DIMM sockets are numbered, left to right in Figure 1-7: 1, 3, 5, 7, 8, 6, 4, 2.
• All modules must have at least one DIMM pair installed in Bank 0.
• DIMMs in each bank must be of the same type, but each bank may have a different
type of DIMM.
• Interleaving between banks and DIMMs is designed into the memory architecture;
you cannot alter the interleaving factors. Maximum interleaving is achieved with a
single bank.
Internal Drive Options and SCSI Channels
The Origin200 server provides bays for two sizes of internal drive options: 5.25-inch
drives and 3.5-inch drives.
5.25-Inch Drives and Drive Bay
The 5.25-inch drive bay can be used for two combinations of drive form-factor:
• one full-height drive
• two half-height drives or two 1-inch drives
The 5.25-inch drives are controlled by SCSI channel 1, and drive IDs are set by jumpers
on the drives. Drives are mounted in a removable peripheral carrier, shown in Figure 1-8.