# Jfs With Redis
juicefs format \
    --storage cos \
    --bucket jfs-redis-******** \
    --access-key ******** \
    --secret-key ******** \
    "redis://127.0.0.1:6379/1" \
    jfs-redis
# 挂载
juicefs mount -d "redis://127.0.0.1:6379/1" /mnt/jfs-redis/
# 卸载
juicefs umount /mnt/jfs-redis/

# Jfs With sqlite
juicefs format \
    --storage cos \
    --bucket jfs-******** \
    --access-key ******** \
    --secret-key ******** \
    "sqlite3:///opt/jfs/jfs.db" \
    jfs
# 挂载
juicefs mount -d "sqlite3:///opt/jfs/jfs.db" /mnt/jfs/
# 卸载
juicefs umount /mnt/jfs/

$ which juicefs
/usr/local/bin/juicefs
$ ln -s /usr/local/bin/juicefs /sbin/mount.juicefs

sqlite3:///opt/jfs/jfs.db    /mnt/jfs       juicefs     _netdev,max-uploads=50,writeback,cache-size=204800     0  0

# 限制文件系统容量 (GiB)
$ juicefs config "sqlite3:///opt/jfs/jfs.db" --capacity 102400
# 限制文件数量 (inode 数)
$ juicefs config "sqlite3:///opt/jfs/jfs.db" --inodes 100000

# 示例
$ df -h | grep jfs
Filesystem      Size  Used Avail Use% Mounted on
JuiceFS:jfs     1.0P  8.0K  1.0P   1% /mnt/jfs

# 设定容量上限为 128 GiB
$ juicefs config "sqlite3:///opt/jfs/jfs.db" --capacity 128
2022/11/20 21:07:08.832094 juicefs[2253158] <INFO>: Meta address: sqlite3:///opt/jfs/jfs.db [interface.go:402]
  capacity: 0 GiB -> 128 GiB

# 再次查看发现大小为 128GiB
$ df -h | grep jfs
JuiceFS:jfs     128G  8.0K  128G   1% /mnt/jfs

# 示例
$ df -i
Filesystem       Inodes  IUsed    IFree IUse% Mounted on
/dev/vda2       3901440 367127  3534313   10% /
JuiceFS:jfs    10485762      2 10485760    1% /mnt/jfs

$ juicefs config "sqlite3:///opt/jfs/jfs.db" --inodes 3901440
2022/11/20 21:13:30.977616 juicefs[2255902] <INFO>: Meta address: sqlite3:///opt/jfs/jfs.db [interface.go:402]
    inodes: 0 -> 3901440
$ df -i
Filesystem       Inodes  IUsed    IFree IUse% Mounted on
/dev/vda2       3901440 367128  3534312   10% /
JuiceFS:jfs     3901440      2  3901438    1% /mnt/jfs

# 本地文件系统 io 性能
$ sync; dd if=/dev/zero of=/tmp/tempfile-12138 bs=1M count=1024; sync
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 5.563 s, 193 MB/s

# JuicfFS sqlite 元数据驱动性能
$ sync; dd if=/dev/zero of=/mnt/jfs/tmpfile bs=1M count=1024; sync
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 6.97672 s, 154 MB/s

# JuicfFS redis 元数据驱动性能
$ sync; dd if=/dev/zero of=/mnt/jfs-redis/tmpfile-12138 bs=1M count=1024; sync
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 5.59675 s, 192 MB/s

# juicefs bench -p 4 /tmp/
  Write big blocks count: 4096 / 4096 [==============================================================]  done
   Read big blocks count: 4096 / 4096 [==============================================================]  done
Write small blocks count: 400 / 400 [==============================================================]  done
 Read small blocks count: 400 / 400 [==============================================================]  done
  Stat small files count: 400 / 400 [==============================================================]  done
Benchmark finished!
BlockSize: 1 MiB, BigFileSize: 1024 MiB, SmallFileSize: 128 KiB, SmallFileCount: 100, NumThreads: 4
+------------------+------------------+--------------+
|       ITEM       |       VALUE      |     COST     |
+------------------+------------------+--------------+
|   Write big file |     153.98 MiB/s | 26.60 s/file |
|    Read big file |     148.60 MiB/s | 27.56 s/file |
| Write small file |   2064.9 files/s | 1.94 ms/file |
|  Read small file |   3150.8 files/s | 1.27 ms/file |
|        Stat file | 111847.4 files/s | 0.04 ms/file |
+------------------+------------------+--------------+

$ juicefs bench -p 4 /mnt/jfs
  Write big blocks count: 4096 / 4096 [==============================================================]  done
   Read big blocks count: 4096 / 4096 [==============================================================]  done
Write small blocks count: 400 / 400 [==============================================================]  done
 Read small blocks count: 400 / 400 [==============================================================]  done
  Stat small files count: 400 / 400 [==============================================================]  done
Benchmark finished!
BlockSize: 1 MiB, BigFileSize: 1024 MiB, SmallFileSize: 128 KiB, SmallFileCount: 100, NumThreads: 4
Time used: 72.0 s, CPU: 35.5%, Memory: 704.1 MiB
+------------------+------------------+---------------+
|       ITEM       |       VALUE      |      COST     |
+------------------+------------------+---------------+
|   Write big file |     148.25 MiB/s |  27.63 s/file |
|    Read big file |     144.29 MiB/s |  28.39 s/file |
| Write small file |     40.5 files/s | 98.83 ms/file |
|  Read small file |    715.9 files/s |  5.59 ms/file |
|        Stat file |   3759.0 files/s |  1.06 ms/file |
|   FUSE operation | 71735 operations |    2.99 ms/op |
|      Update meta |  4773 operations |   27.18 ms/op |
|       Put object |  1424 operations |  443.33 ms/op |
|       Get object |     0 operations |    0.00 ms/op |
|    Delete object |     0 operations |    0.00 ms/op |
| Write into cache |  1424 operations |  281.82 ms/op |
|  Read from cache |  1428 operations |  556.68 ms/op |
+------------------+------------------+---------------+

$ find .trash -name '*.tmp' | xargs rm -f