3Ware 9550SX-4LP User Guide - Page 128

Chapter 7. Configuring Your Controller When Yes, the unit write cache and the disk drive write cache will be disabled if the unit degrades. This setting has no effect on non-redundant arrays. Write cache will be automatically re-enabled when the unit returns to normal. When No, the unit and disk drive write cache will remain enabled (if it is enabled), in the event that the unit degrades. This policy can only be set in 3BM and CLI. • Staggered method. Indicates whether the type of staggered spin-up is ATA-6 or SATA OOB (Out Of Band). By default, when Staggered Spinup is enabled, the ATA-6 scheme is used. If your drives support the SATA OOB method, select that method in 3BM. There is no electronic method for the controller to know if a drive supports this method, so it must be set manually. For staggering to work properly, the drives must support the selected method. This policy can only be set and only shows in 3BM. Some additional policies can be set at the unit level. For more information, see Chapter 8, "Configuring Units." Viewing Controller Policies You can view the current state of controller policies in 3DM, in the Other Controller Settings section at the bottom of the Controller Settings Page, as shown in Figure 49. However, only the Auto-Rebuild, Auto-Carving, and Carve Size policies can be changed on this page. The other policies can be changed in 3BM or through the CLI. For a summary of the initial default settings, see Table 5, "Initial Default Settings for Policies," on page 17. 118 3ware Serial ATA RAID Controller User Guide