你有没有考虑过，XFS文件系统保留了多少块？这些值是可以通过以下命令获得的：
# xfs_info /root/test
meta-data=/dev/vda2 isize=256 agcount=4, agsize=6400 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=25600, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
查看xfs文件系统保留块数
[root@yunweixia.com ~]# xfs_io -x -c "resblks" /root/test reserved blocks = 8192 available reserved blocks = 8192
查看xfs文件系统保留快的百分比
保留块百分比为：100 * “保留块”/（agsize * agcount）用户可能会惊讶地看到小于 1% 的值，而较旧的文件系统通常默认为 5%。这条评论在fs/xfs/xfs_mount.c源代码解释了原因：
/* * We default to 5% or 8192 fsbs of space reserved, whichever is * smaller. This is intended to cover concurrent allocation * transactions when we initially hit enospc. These each require a 4 * block reservation. Hence by default we cover roughly 2000 concurrent * allocation reservations. */
原创文章，作者：运维侠，如若转载，请注明出处：https://www.yunweixia.com/knowledgebase/xfs-filesystem-reserved-blocks-count-explained.html
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