HP P4000 9.0 HP StorageWorks P4000 SAN Solution User Guide - Page 56
RAID devices by RAID type, Virtual RAID devices, Planning the RAID configuration, Data protection - vsa
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RAID devices by RAID type Each RAID type creates different sets of RAID devices. Table 11 on page 56 contains a description of the variety of RAID devices created by the different RAID types as implemented on various storage systems. Table 11 Information in the RAID setup report This item Device Name Device Type Device Status Subdevices Describes this The disk sets used in RAID. The number and names of devices varies by storage system and RAID level. The RAID level of the device. For example, in a P4300 G2, RAID 5 displays a Device Type of RAID 5 and subdevices as 8. The RAID status of the device. The number of disks included in the device. Virtual RAID devices If you are using the VSA, the only RAID available is virtual RAID. After installing the VSA, virtual RAID is configured automatically if you first configured the data disk in the VI Client. HP recommends installing VMware ESX Server on top of a server with a RAID 5 or RAID 6 configuration. Planning the RAID configuration The RAID configuration you choose for the storage system depends on your plans for data fault tolerance, data availability, and capacity growth. CAUTION: Plan your RAID configuration carefully. After you have configured RAID, you cannot change the RAID configuration without deleting all data on the storage system. Data protection Keeping multiple copies of your data ensures that data is safe and remains available in the case of disk failure. There are two ways to achieve data protection: • Configure RAID 1, RAID 10, RAID 5, RAID 5 + spare, RAID 50, or RAID 6 within each storage system to ensure data redundancy. • Always use Network RAID to mirror data volumes across storage systems in a cluster, regardless of RAID level, for added data protection and high availability. 56 Storage Configuration: Disk RAID and Disk Management
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