Chapter 1. Overview of EVMS / 1.2. Plug-In Layers | ||||
|---|---|---|---|---|
 | Chapter 1. Overview of EVMS | 1.3. Supported File Systems |  | |
Chapter 1. Overview of EVMS / 1.2. Plug-In Layers | ||||
|---|---|---|---|---|
| Chapter 1. Overview of EVMS | 1.3. Supported File Systems | | |
EVMS abstracts the storage objects in functional layers to make storage management more user-friendly. The following table describes the current EVMS plug-in layers for managing storage devices and file systems:
Table 1.1. EVMS Plug-In Layers
|
Storage Managers |
Description |
Plug-Ins |
|---|---|---|
|
Device |
Manages the physical and logical devices |
Device Mapper (DM) |
|
Segment |
Manages the partitioning of physical and logical devices into smaller segments of free space. Segment managers can be stacked. For example, a cluster segment can contain other storage objects or volumes. |
Uses Device Mapper (DM) Segment managers include DOS, GPT, System/390* (S/390), Cluster, BSD, Mac, and BBR For more information, see Section 4.1, “Understanding Disk Segmentation”. |
|
Regions |
Manages the combination of multiple storage objects |
LVM/LVM2 for containers and region, MD for RAIDs, and DM for multipath I/O |
|
EVMS Features |
Manages EVMS features |
Drive linking (linear concatenation), Bad Block Relocation (BBR), and Snapshot |
|
File System Interface Modules (FSIM) |
Manages the interface between the file system managers and the segment managers |
For information, see Section 1.3, “Supported File Systems”. |
|
Cluster Manager Interface Modules |
Manages the interface between the cluster manager and the file systems and devices |
HeartBeat 2 |
