3Ware 9550SX-4LP User Guide - Page 228

Chapter 10. Maintaining Your Controller Viewing Battery Information The Battery Backup Unit (BBU) is an add-on card that can be attached to a 3ware 9000 RAID controller to supply power from a battery pack in the event of a system power loss. This allows the controller to use write-caching for optimal performance and to preserve data in the event of a system power failure. When fully charged, the battery preserves the contents of the cache memory for up to 72 hours. When power is restored, the cached write data is written to the disks. Two different BBU models are available, one for 9500S controllers (BBU9500S-01) and one for 9550SX and 9590SE controllers (BBU-9550SX-01). Note: When the BBU status is not "Ready," write caching is automatically disabled on all units attached to the controller. You can see information about a battery backup unit attached to your controller in both 3DM 2 and 3BM. To view information about a BBU in 3DM 2 • On the menu bar, choose Monitor > Battery Backup. The Battery Backup Page appears, on which you can see details and status about the unit. This page is refreshed every 30 seconds. For details about the fields on this page, see "Battery Backup Page" on page 110. To view information about a BBU in 3BM • At the main 3BM screen, tab to the Information button and press Enter. On the pop-up menu, select Battery Backup and press Enter. The Battery Backup Unit screen appears. The fields on this screen are the same as those available through 3DM. For details about the fields, see "Battery Backup Page" on page 110. 218 3ware Serial ATA RAID Controller User Guide