A very low amount of free space and a high number for pages in and out probably indicates a lack of VM and, with very high pages in and out, probably a lack of physical RAM.
非常低的空闲空间量和较高的换入或换出页数可能表明VM不足，非常高的换入和换出页数可能表明物理ram不足。
The ability to find regions of free space quickly is critical for maximizing write performance, which is something that XFS is very good at.
XFS擅长于迅速发现空闲空间区域，这种能力对于最大化写性能很关键。
This would normally free up space in the file system but because of the internal snapshot there is very little change in the amount of free space in the file system.
这通常会释放文件系统中的空间，但由于内部快照很小，所以文件系统中的空闲空间变化也很小。
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