HP P3410A HP NetRAID Series User Guide - Page 30

Chapter 2 HP NetRAID Assistant • Change Config: Changes the parameters of a logical drive. To use this option, first select the logical drive or drives to change, then click Change Config. ◊ Cache: There are two Cache policies: ∗ Direct I/O specifies that only repeated reads to same locations are cached. ∗ Cached I/O specifies that all reads are cached. ◊ Read: There are three Read policies: ∗ Read Ahead tells the adapter to read sequentially ahead of requested data and cache the further data in memory, anticipating that the further data will be requested. ∗ Normal specifies that the controller does not use Read-Ahead for the current logical drive. ∗ Adaptive Read Ahead specifies that the adapter begins using Read-Ahead if the two most recent disk accesses occurred in sequential sectors. ◊ Write: There are two Write policies: ∗ Write-Back specifies that data is written to disk only when it is forced out of the cache. Write-back is efficient, because an entry may be written many times in the cache without a disk access. ∗ Write-Through specifies that data is written to disk at the same time as it is cached. Write-Through caching has a data security advantage over Write-Back caching. ◊ RAID Level: This option allows you to change the RAID level. ◊ Virtual Size: This selection is not available. Use HP NetRAID Express Tools to enable the Virtual Sizing parameter. ◊ Add Capacity: Use this option to add a physical disk to the logical drive. HP NetRAID reconstructs your data to incorporate the new physical drive into the array. Logical Drive Right Mouse Button Menu To access this menu, select (highlight) a logical drive in the Logical Devices box and click the right mouse button. The following pop-up menu options appear: • Delete (deletes the last array created, one at a time) 24