Open vStorage Ganesha Object FileSystem (GObjFS)
The Open vStorage Ganesha Object File System (GObjFS) provides a flat object store to an ASD (one raw block device). It was designed to be used with Alba/Open vStorage. The performance characteristic are hence tuned to be:
- Writes - High Throughput (high latency is fine as writes are in large chunks and where acknowledged to the application while in the write buffer)
- Reads - Low Latency and high throughput
It support the following functions:
- Get (ContainerID + Offset + Length)
- Put (Payload and return ContainerID+Offset) - no append
- Delete (ContainerID+Offset+Length)
At the most basic level this component divides an SSD into logical containers (256MB each).
This component will use the following:
- The kernel block device
- Block Allocation Bitmap (per container) - In memory structure where a bit (for every 16K) represents whether the block is used or empty. This BAB doesn’t have to be persistent across reboots.
- Each container will have a write lock
- There will be a containerID -> actual region on disk mapping
GObjFS is licensed under the GNU Affero General Public License v3.
File a bug
Open vStorage and its automation is quality checked to the highest level. Unfortunately we might have overlooked some tiny topics here or there. The Open vStorage GObjFS Project maintains a public issue tracker where you can report bugs and request features. This issue tracker is not a customer support forum but an error, flaw, failure, or fault in the Open vStorage software.