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Linux文件系统预留空间

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作者 echoCourage 2 分钟阅读 阅读次数:

查看当前的磁盘分区

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df -h

磁盘预留空间的查看

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tune2fs -l /dev/sda3

tune2fs 1.46.5 (30-Dec-2021)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          80d41da7-20fb-428e-b2b3-fe4368f7e951
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
Filesystem flags:         signed_directory_hash 
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              234332160
Block count:              937318144
Reserved block count:     46865907
Overhead clusters:        14997498
Free blocks:              913803802
Free inodes:              234067937
First block:              0
Block size:               4096
Fragment size:            4096
Group descriptor size:    64
Reserved GDT blocks:      1024
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Fri Mar  1 14:24:20 2024
Last mount time:          Thu Mar 28 13:53:06 2024
Last write time:          Thu Mar 28 13:53:05 2024
Mount count:              5
Maximum mount count:      -1
Last checked:             Fri Mar  1 14:24:20 2024
Check interval:           0 (<none>)
Lifetime writes:          251 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:	          256
Required extra isize:     32
Desired extra isize:      32
Journal inode:            8
First orphan inode:       6822187
Default directory hash:   half_md4
Directory Hash Seed:      1d3bc2b0-ac94-4344-a6c6-008910beaf7e
Journal backup:           inode blocks
Checksum type:            crc32c
Checksum:                 0x5d862ec3

分析当前的状态

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Reserved block count:     46865907  # 预留空间大小
Block size:               4096      # 块大小

预留空间占用大小: 46865907 * 4096 = 191962755072 字节, 即 178GB

调整这个预留空间的大小

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预留空间是为了给文件系统保留一些空间供系统管理员使用，在磁盘空间快满的时候防止系统崩溃

tune2fs -m <percentage> /dev/sdX
eg: tune2fs -m 10 /dev/vdb1

percentage: 百分比，比如 10，预留空间设置为 10%
/dev/sdX  : 磁盘分区, 比如: /dev/vdb1
系统相关, Linux相关, 系统优化
系统相关 Linux相关 系统优化
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