H3C CAS 接口获取到的虚机的磁盘使用信息与系统内部查看不一致？

1.虚机详情接口 --各个磁盘使用信息

2.使用率接口 -- 各个磁盘使用率

3.登录虚机后，查看各个磁盘使用情况

三者有时候一致，有时候前两个一致，但与实际不一致

能解释一下原因吗

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