HP AiO400r HP StorageWorks All-in-One Storage System User Guide (440583-006, J - Page 78

Physical storage Item Description Notes Hot spare required A hot spare is a hard drive reserved as a spare for storage space configured as RAID 1, 1+0, 5, or 6. A hot spare automatically replaces a hard drive when it fails. When the failed hard drive is replaced, its replacement becomes the new hot spare. A hot spare is assigned at the array level. A LUN that does not require a hot spare may be assigned one anyway if another LUN on the same array requires a hot spare. * Minimum number of physical disks The minimum number of physical disks that the allocated storage will be spread across. Storage may be provisioned across more disks, but this setting determines the minimum number of disks reserved for the allocated storage. For better performance, increase the minimum number of physical disks Assigned logical disk The storage area can be assigned to an existing logical disk, or it can be assigned a new disk, which is created upon completion of the scheduled tasks for the storage wizard. RAID stripe size The number of bytes or kilobytes of data in each RAID stripe (block of data). The RAID stripe size selected affects performance. For the best performance, select the stripe size closest to the size of the files being saved. ASM provides the following values: 8 KB, 16 KB, 32KB, 64 KB, 128 KB, and 256 KB.* Snapshot storage space (percentage of size) Amount of storage space (as a percentage of This value may be modified in order the volume) that is reserved for storing snapshots to match the change rate of the of the storage area. data in the storage area. Other storage settings Percent full warning threshold The percent full value that when reached changes the storage status to Warning and issues a warning alert. The warning indicates that storage use has surpassed the percentage full value. For example, if you enter 75%, you see a warning (yellow asterisk) in the content pane when storage is at 75 percent full. The percent full warning threshold is set by default to 80%. Percent full warning threshold values are ASM-specific; percent full warning threshold values selected in the Quota Management MMC snap-in are not adopted by ASM. All other Quota Management MMC snap-in settings are adopted by ASM. See Setting a percent full warning threshold on page 80. Enforce allocated limit (quota) Sets an enforced quota for the amount of storage available to a shared folder or local storage application. When the storage space allocated to a component is full, no further data can be saved to this component. This item is available for shared folders and local storage component. See Enforcing an allocated storage limit for shared folders and local storage applications on page 81. Application server volume mount type Indicates whether the storage area is hosted on This setting does not apply to a mount point or drive letter. shared folders. *After you have allocated and configured storage for an application component, user-defined application, or shared folder using a wizard, you can change the allocated space size, change the percent full warning threshold, and change the enforced allocated limit (shared folders and local storage applications). However, you cannot change the RAID level, RAID stripe size, Hot Spares, or Physical Disk Type. 78 Hosting storage for applications and shared folders