5MASM磁盘组中的磁盘LUN数为什么推荐设置为活动路径4倍，有什么依据？
还是我理解的有问题，望大神解惑。
官方文档原文：
The number of LUNs (Oracle ASM disks) for each disk group should be at least equal to four times the number of active I/O paths. For example, if a disk group has two active I/O paths, then minimum of eight LUNs should be used. The LUNs should be of equal size and performance for each disk group.
An I/O path is a distinct channel or connection between storage presenting LUNs and the server. An active I/O path is an I/O path in which the I/O load on a LUN is multiplexed through multipathing software.
参考官方资料：
在官方文档《Automatic Storage Management Administrator’s Guide》的“2 Exploring Considerations for Oracle ASM Storage”》“Recommendations for Storage Preparation”部分。
文档地址：
Oracle 19c ASM 文档
我个人是这么理解的，仅供参考: 假如 两条active LUN,假如是RAC两节点，那就有四种分布，（2,0),(1,1),(1,1),(0,2), 所以一个节点最多是两条actice 的lun , 因为要实现链路可切换的情况，那一节点至少还应该要有两条备用链路，那一节点总共就是4条，二节点同上，因此至少就是 2* 2 *2=8,所以总结一一下那其实就是官方文档说的 The number of LUNs (Oracle ASM disks) for each disk group should be at least equal to four times the number of active I/O paths.
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