Intel SASWT4I Hardware User Guide - Page 13

- Disk Write Cache: The data written / (done) signal is returned when data is written to the drive or only to the drive's cache. ✧ On (default): Write-back mode enabled. Faster, because it does not wait for the disk, but data will be lost if power is lost. ✧ Off: Write-through mode enabled. Slower, but ensures data is on the disk. • Redundancy through: - Configuration stored in non-volatile RAM and on the drives (COD). - Hot-swap support. SAS and SATA Features • Provides four independent PHYs, each supporting 3.0 Gbps and 1.5 Gbps SAS and SATA data transfers. • Scalable interface that supports up to 14 physical devices and 2 logical devices in IR mode, or up to 122 physical devices in IT mode. • Transfers data using SCSI information units. • Supports SSP to enable communication with other SAS devices. • Supports SMP to communicate topology management information. • Allows addressing of multiple SATA targets through an expander if using SATA 2.0- compliant hard disk drives. Operating System Support The Intel® RAID Controller SASWT4I supports major operating systems, including: • Microsoft Windows Server 2008*, Microsoft Windows Server 2003*, and Microsoft Windows XP* • Red Hat* Enterprise Linux 4.0 and 5.0 • SuSE* Linux Enterprise Server 9 and 10 Note: The operating systems supported by this controller may not be supported by your server board. See the Tested Operating System List for your server board at http://support.intel.com/support/motherboards/server/. See also the Tested Hardware and Operating System List for the Intel® RAID Controller SASWT4I to make sure the operating system you are using with the controller is supported. Intel® RAID Controller SASWT4I Hardware User's Guide 3