HP StoreVirtual 4000 9.0 HP StorageWorks P4000 SAN Solution User Guide - Page 207
What it means, Configurable for, Primary or Remote, Volume, Volume characteristic
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Volume characteristic Configurable for Primary or Remote Volume Data Protection Level Both Type Both Provisioning Primary What it means The data protection level indicates the number and configuration of data copies created on storage systems in the cluster. There are six levels of data protection • Network RAID-0 (None) • Network RAID-5 (Single Parity) • Network RAID-6 (Dual Parity) • Network RAID-10 (2-Way Mirror) • Network RAID-10+1 (3-Way Mirror) • Network RAID-10+2 (4-Way Mirror) The default value = Network RAID-10. For information about the data protection levels, see "Planning data protection" on page 190. • Primary volumes are used for data storage. • Remote volumes are used for configuring Remote Copy for business continuance, backup and recovery, or data mining/migration. Default value = Primary • Fully provisioned volumes are the same size on the SAN as the size presented to the application server. • Thinly provisioned volumes have less space reserved on the SAN than the size presented to the application server. As data is stored on the volume, the SAN/iQ software automatically increases the amount of space allocated on the SAN. The default value = Full for the following data protection levels. • Network RAID-0 (None) • Network RAID-10 (2-Way Mirror) • Network RAID-10+1 (3-Way Mirror) • Network RAID-10+2 (4-Way Mirror) The default value = Thin for the following data protection levels. • Network RAID-5 (Single Parity) • Network RAID-6 (Dual Parity) Thin provisioning is the best practice configuration for Network RAID-5 and Network RAID-6 volumes. NOTE: The SAN/iQ software allocates space as needed. However, thin provisioning carries the risk that, if all warnings are ignored, an application server will fail a write because the SAN has run out of disk space. P4000 SAN Solution user guide 207
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