HP Xw8400 Workstation RAID Support - Page 7

RAID 1 Arrays (Mirrored) Block 1 Block 2 Block 3 Block 4 Block 5 Block 6 Block 7 Block 8 Logical Drive Size = Half of total physical capacity All data written to both drives Block 1 Block 2 Block 3 Block 4 Block 5 Block 6 Block 7 Block 8 Block 1 Block 2 Block 3 Block 4 Block 5 Block 6 Block 7 Block 8 Drive A Drive B Physical Drives • RAID 1 = Mirror • Data is written to two physical drives in real time • On single disk failure - no system downtime All data immediately available from other drive • Duplicate drive rebuilt upon replacement • Physical space is cut in half (for example, two 40GB drives needed for • 40GB of space) • With no loss of data, RAID 1 is perfect for applications requiring very high availability/security 7