IBM System x iDataPlex dx360 M3 User Manual page 30

The following illustration shows a 3U chassis. The 3U chassis contains a power
supply and a fan assembly that provide operating power and cooling for all
components in the chassis. Depending on your server configuration, it also provides
support for the installation of up to twelve 3.5-inch hot-swap SAS or SATA hard disk
drives (SAS and SATA hard disk drives cannot be used within the same server).
The 3U chassis supports one system-board tray that must contain a RAID adapter
to control operation of these hard disk drives.
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System x iDataPlex dx360 M3: User's Guide