W i e b e T e c h L L C
Appendix C: Glossary
CV | Cache Volume |
| Cache is memory used to speed up data transfer to and from a |
| disk. A Cache Volume is assigned to each UDV for execution of the |
| data transaction. Each CV can have different cache memory size. |
| Types of Cache Volume: |
| Dedicated Cache is a Cache Volume that is assigned to a |
| specified UDV. |
| Global Cache is a Cache Volume that is shared by all UDVs. |
| Degrade mode |
| Degrade mode is a status alert on the GUI to show which VG |
| has degraded or failed. |
GUI | Graphical User Interface |
HBA | Host Bus Adapter |
| HBA is a device that connects the host system to a storage |
| system and allows users to pass and retrieve data on this |
| bus. |
Host | Host System |
| A computer, typically a server or a workstation, which |
| operates and monitors the storage system. |
LUN | Logical Unit Number |
| LUN is the identifying number assigned to a UDV that allows the |
| host system to distinguish between different UDVs. |
PD | Physical Disk |
| The PD refers to the actual hard drive that can be selected to |
| be a member of a volume group. |
RAID | Redundant Array of Independent Disks |
| RAID is a disk array consisting of two or more disks to provide fault |
| tolerance and better performance. There are different RAID levels |
| with different degrees of the data protection. Please see Appendix |
| A.2 for more information on RAID levels and minimum |
| requirements. |
| Reserved |
| This disk was part of a VG and contains data from the VG. |
| The reserved status may be caused by removal of drive while |
| system was running. In reserved status, this disk can only be |
| used to rebuild the VG. To make this disk usable, perform a |
| Free Disc by manually selecting the disk and click |
| . |
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