OSDI 2023 paper (https://www.usenix.org/conference/osdi23/presentation/min)

git clone https://github.com/jaehongm/eZNS
cd eZNS
git submodule update --init

eZNS is currently only tested with the small-zone SSD described in the paper. You may use any small-zone SSD (regardless of real-hardware or software-emulated), but it must support all mandatory commands in the ZNS standard (e.g., Zone Reset, Get Zone Info, etc). Due to the lack of commands, eZNS does not support bdev_zone_block in SPDK.

eZNS is implemented as a bdev module (bdev_detzone) in SPDK. Source codes are located at ./modules/bdev/detzone. You can run rpc.py to find available RPC commands.

./scripts/rpc.py --help
./scripts/rpc.py bdev_detzone_create --help
./scripts/rpc.py bdev_detzone_delete --help
./scripts/rpc.py bdev_detzone_ns_create --help
./scripts/rpc.py bdev_detzone_ns_delete --help

We provide a sample configuration JSON file (ezns_rdma.json) used in the paper. It creates an NVMe-over-Fabrics RDMA target with four eZNS namespaces over a single small-zone SSD.

You can enable/disable features in vbdev_detzone_internal.h. Most of the parameters are also configurable, but we recommend you read the paper and take some time with the codes before making a change.

This version DOES NOT guarantee full recovery after shutdown. (Current recovery procedure does not apply to the latest data structure.) We highly recommend users perform RESET for all zones before running eZNS.