Hot-swap drives
Use this section to understand the cable routing for server models with hot-swap drives.
See the configuration that is applied to the server. 
•  Software RAID 
–  “Four 3.5-inch drives” on page 49
–  “Eight 3.5-inch drives” on page 51
–  “Eight 2.5-inch drives” on page 53
•  Hardware RAID
–  “Four 3.5-inch drives with one 8i RAID adapter” on page 50
–  “Eight 3.5-inch drives with one 8i RAID adapter” on page 52
–  “Eight 2.5-inch drives with one 8i RAID adapter” on page 54
–  “Sixteen 2.5-inch drives with one 16i RAID adapter” on page 55
–  “Sixteen 2.5-inch drives with two 8i RAID adapters” on page 56
–  “Four 3.5-inch and eight 2.5-inch drives with one 16i RAID adapter” on page 57
–  “Four 3.5-inch and eight 2.5-inch drives with two 8i RAID adapters” on page 58
Four 3.5-inch hot-swap drives
Use this section to understand the cable routing for server models with four 3.5-inch hot-swap drives.
Following are the options available for this configuration: 
•  “Software RAID” on page 49
•  “One 8i RAID adapter” on page 50
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ThinkSystem ST250 V2 Maintenance Manual