partition_num 如何设置 ，根据使用手册 建议设置为硬盘的20倍
1、partition_num 的作用将storage 聚合为一个逻辑单元，其具体的作用是什么 加速查询速度？我理解越多数据分散越多需要聚合的越多，相对不是影响速度吗
2、例如下面的硬盘信息，如果设置partition_num的数量hhd
fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
Disk /dev/sda: 599.9 GB, 599932272640 bytes, 1171742720 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 262144 bytes / 524288 bytes
Disk label type: gpt
Disk identifier: 46BFFDEE-FA99-4C57-B39E-7E36C2EC1DDA
# Start End Size Type Name
1 2048 2099199 1G EFI System primary
2 2099200 35653631 16G Microsoft basic primary
3 35653632 245368831 100G Microsoft basic primary
4 245368832 1171740671 441.7G Microsoft basic primary