In short, NBStack is a storage system that provides an atomic write interface to user applications (like F2FS). Internally, NBStack eliminates file system ordered writes by giving access to the flash out-of-band area and organizing the blocks of an atomic write write back as a single linked list. Therefore, NBStack can achieve higher operations per second compared with F2FS.
For more information, please refer to our paper "Better atomic writes by exposing the flash out-of-band area to file systems" in LCTES 21.
Quick link:
- LCTES 21: https://pldi21.sigplan.org/home/LCTES-2021
- DOI link: https://doi.org/10.1145/3461648.3463843
Use FEMU to emulate an Open-Channel SSD for your QEMU virtual machine. We recommend FEMU commitID 464d8aab1810a738cd22187bd9a8ffd6a22c7683.
Our implementation is based on Linux kernel 5.1.
git clone https://github.com/WNLO-DSAL/NBStack
Do the additional tweaks described in https://github.com/ucare-uchicago/FEMU/wiki/FEMU-Best-Practice.
If your linux kernel source resides in /usr/src/kernels/linux
, you can use our script to apply kernel patch.
cd NBStack
./patch_kernel.sh
Check out patch_kernel.sh
for details.
Here's a nice article from kernelnewbies for buiding instructions.
Don't forget to enable lightNVM(NVM=y
) and disable pblk(NVM_PBLK=n
). After compilation, restart and login to the new kernel.
cd ~
git clone https://github.com/linux-nvme/nvme-cli
cd nvme-cli
make
make install
cd /path/to/NBStack/src/qblk
make -j16
./install
# This will create a block device /dev/qblkdev
# Check out block devices
lsblk
The physical format of NBFS and F2FS are the same. The following script works for both F2FS and NBFS.
cd /path/to/NBStack/src/qblk
./makef2fs
# This will format /dev/qblkdev as F2FS
cd /path/to/NBStack/src/nbfs
vim nbfs.h
Modify the nbfs.h
to choose the file system we wan't to run.
- F2FS: Comment out
#define USE_NBFS
- NBFS-L:
#define USE_NBFS
+#define NBFS_DURABILITY_MODE (0)
- NBFS-D:
#define USE_NBFS
+#define NBFS_DURABILITY_MODE (1)
- NBFS-U:
#define USE_NBFS
+#define NBFS_ULTRAFAST_MODE
make -j16
./install
./mountnbfs
# This will create a directory /mnt/qhw and mount /dev/qblkdev to /mnt/qhw
# Check out the mount:
mount | grep qhw
cd /path/to/NBStack
# Prepare for the tests
./preparetest.sh
cd scripts/lctes
# Push button tests
./mobibench.sh
cd /path/to/NBStack
# Prepare for the tests
./preparetest.sh
cd evaluations/2-TaskRunningTime
# Follow the instructions to test.
cat README.md