Centos 7.9 xfs 文件系统测试

1.xfs文件系统的特点
XFS是一种高性能的日志文件系统,
它是由SGI公司设计的,被称为业界最先进的、最具可升级性的文件系统技术。
最初是从unix(irix)移植到linux系统上的。
从centos7开始，xfs成为了默认的文件系统

2.centos8中的xfs
2.1最大单文件大小:500TB
最大分区大小: 1024TB

2.2相比较之下，centos6 的ext4:
最大单文件大小:16TB
最大分区大小: 16TB
可见对于大型文件系统的支持，xfs比ext4要好得多https://www.cndba.cn/hbhe0316/article/5018

3.xfs相关的工具程序属于哪个包及安装
找不到mkfs.xfs命令时，可以用yum安装

[root@ansible ~]# yum install xfsprogs -y

4.查看xfs相关工具的版本

[root@ansible ~]# mkfs.xfs -V
mkfs.xfs version 4.5.0

查看帮助：不指定参数时，会打印帮助信息

[root@ansible ~]# mkfs.xfs
no device name given in argument list
Usage: mkfs.xfs
/* blocksize */         [-b log=n|size=num]
/* metadata */          [-m crc=0|1,finobt=0|1,uuid=xxx]
/* data subvol */       [-d agcount=n,agsize=n,file,name=xxx,size=num,
(sunit=value,swidth=value|su=num,sw=num|noalign),
sectlog=n|sectsize=num
/* force overwrite */   [-f]
/* inode size */        [-i log=n|perblock=n|size=num,maxpct=n,attr=0|1|2,
projid32bit=0|1]
/* no discard */        [-K]
/* log subvol */        [-l agnum=n,internal,size=num,logdev=xxx,version=n
sunit=value|su=num,sectlog=n|sectsize=num,
lazy-count=0|1]
/* label */             [-L label (maximum 12 characters)]
/* naming */            [-n log=n|size=num,version=2|ci,ftype=0|1]
/* no-op info only */   [-N]
/* prototype file */    [-p fname]
/* quiet */             [-q]
/* realtime subvol */   [-r extsize=num,size=num,rtdev=xxx]
/* sectorsize */        [-s log=n|size=num]
/* version */           [-V]
devicename
<devicename> is required unless -d name=xxx is given.
<num> is xxx (bytes), xxxs (sectors), xxxb (fs blocks), xxxk (xxx KiB),
xxxm (xxx MiB), xxxg (xxx GiB), xxxt (xxx TiB) or xxxp (xxx PiB).
<value> is xxx (512 byte blocks).

五例子:格式化一个分区为xfs文件系统并挂载https://www.cndba.cn/hbhe0316/article/5018

[root@ansible ~]# fdisk -l
Disk /dev/sdb: 10.7 GB, 10737418240 bytes, 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000db7bd
Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   209469439   103685120   8e  Linux LVM
Disk /dev/mapper/centos-root: 97.7 GB, 97710505984 bytes, 190840832 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-swap: 8455 MB, 8455716864 bytes, 16515072 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
[root@ansible ~]# mkfs.xfs /dev/sdb
meta-data=/dev/sdb               isize=512    agcount=4, agsize=655360 blks
=                       sectsz=512   attr=2, projid32bit=1
=                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=2621440, imaxpct=25
=                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2
=                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
[root@ansible ~]# mount /dev/sdb /data
[root@ansible ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 3.9G     0  3.9G   0% /dev
tmpfs                    3.9G     0  3.9G   0% /dev/shm
tmpfs                    3.9G  8.7M  3.9G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root   91G  2.0G   90G   3% /
/dev/sda1               1014M  171M  844M  17% /boot
tmpfs                    799M     0  799M   0% /run/user/0
/dev/sdb                  10G   33M   10G   1% /data

加入/etc/fstab文件