HP ML150 HP ProLiant Intel-based 100-series G6 server technology - Page 13

Battery backed write cache The BBWC is required for capacity expansion (adding one or more physical disks to an existing array). The controller recalculates parity and balances the data across all the disks. During the expansion, the BBWC preserves data and logical structures on the array. The HP 650 mAh P-Series battery extends battery life up to 48 hours before recharging is necessary. NOTE: The Smart Array P212 does not support 512 MB BBWC, and is only upgradeable to 256 MB BBWC Zero Memory RAID Using Zero Memory RAID (ZMR), administrators can create a RAID 0-1 configuration without using any additional memory. Smart Array P410, P411, and P212 controllers include ZMR. The P212 controller does not include ZMR on the external connector. ZMR supports up to eight drives in Zero Memory Mode, or seven drives and one tape drive. ZMR mode does not support Modular Smart Array (MSA) products. ZMR does not include any caching. All systems can be upgraded to a BBWC memory module that can significantly increase performance. NOTE: Smart Array Advanced Pack is not available on Zero Memory configurations. Software RAID HP has developed a software RAID solution based on the Smart Array firmware. The B110i SATA Software RAID supports the Array Configuration Utility (ACU), ACU-CLI (command line interface), Simple Network Management Protocol (SNMP) agents, and Web-Based Enterprise Management (WBEM) providers. Supported on the ProLiant DL160, DL170h, DL180, and ML150 G6 servers, the B110i features an OS-specific driver from HP that uses the embedded ICH10R controller. It can utilize RAID 0, 1, and 1+0 and supports a maximum of two logical drives. The B110i supports up to four 1.5Gb or 3Gb SATA drives. Administrators can migrate drives to a hardware-based Smart Array controller in a seamless procedure that maintains the user data and RAID configuration. For a listing of the complete feature set and support information for the B110i SATA Software RAID, download the B110i user guide at http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01706551/c01706551.pdf Smart Array Advanced Pack HP Smart Array Advanced Pack (SAAP) firmware provides advanced functionality within Smart Array controllers. This firmware further enhances performance, reliability, and data availability. SAAP is hosted on the Smart Array controller hardware firmware stack. It can be enabled beginning with the present generation of Smart Array controllers. SAAP requires a license key for activation. After activation, administrators can use several standard capabilities: • RAID 6 with Advanced Data Guarding (ADG) protects against failure of any two drives. It requires a minimum of four drives, but only two will be available for data. ADG can tolerate multiple simultaneous drive failures without downtime or data loss, and it is ideal for applications requiring large logical volumes because it can safely protect a single volume of up to 56 disk drives. RAID ADG also offers lower implementation costs and greater usable capacity per U than RAID 1. 13