如何调整格式化为XFS文件系统的LVM分区大小

Published by davidliu on

一、环境说明

如图示实例,红色箭头所指/usr空间已使用80%,对应的LVM分区为rootvg-usr。如何对rootvg-usr分区扩容?

图示实例中rootvg-usr所属的卷组为rootvg,尚有不到6GB的剩余可用空间用于扩容。

若PFree为0,如何对rootvg-usr扩容?

可通过缩减卷组rootvg下其他LVM分区大小(如rootvg-tivoli),腾出可用空间给rootvg-usr去扩容。

下面通过实验环境进行验证并给出具体操作步骤,实验环境如图示:

实验目标:缩减/tivoli空间大小(8GB->4GB),增加/usr空间大小(6GB->10GB)。

二、操作步骤

2.1缩减/tivoli空间大小(8GB->4GB)

2.1.1使用xfsdump备份/tivoli下数据

安装xfsdump:

# yum install xfsdump -y

备份数据到/app下:

# xfsdump -f /app/tivoli.dump /tivoli

提示输入label时不可忽略,过程如下:

xfsdump: using file dump (drive_simple) strategy

xfsdump: version 3.1.7 (dump format 3.0) – type ^C for status and control

 ============================= dump label dialog ==============================

please enter label for this dump session (timeout in 300 sec)

 -> tivolidump20210525

session label entered: “tivolidump20210525”

 ——————————— end dialog ———————————

xfsdump: level 0 dump of localhost.localdomain:/tivoli

xfsdump: dump date: Tue May 25 09:29:51 2021

xfsdump: session id: 50bd343c-6c09-4341-8ecc-434bea9d5006

xfsdump: session label: “tivolidump20210525”

xfsdump: ino map phase 1: constructing initial dump list

xfsdump: ino map phase 2: skipping (no pruning necessary)

xfsdump: ino map phase 3: skipping (only one dump stream)

xfsdump: ino map construction complete

xfsdump: estimated dump size: 19793664 bytes

xfsdump: /var/lib/xfsdump/inventory created

 ============================= media label dialog =============================

please enter label for media in drive 0 (timeout in 300 sec)

 -> tivolidump20210525

media label entered: “tivolidump20210525”

 ——————————— end dialog ———————————

xfsdump: creating dump session media file 0 (media 0, file 0)

xfsdump: dumping ino map

xfsdump: dumping directories

xfsdump: dumping non-directory files

xfsdump: ending media file

xfsdump: media file size 19584736 bytes

xfsdump: dump size (non-dir files) : 19409336 bytes

xfsdump: dump complete: 36 seconds elapsed

xfsdump: Dump Summary:

xfsdump:   stream 0 /app/tivoli.dump OK (success)

xfsdump: Dump Status: SUCCESS

[root@localhost /]#

2.1.2卸载分区

# umount /tivoli

2.1.3使用lvreduce收缩逻辑卷到所需的大小

# lvreduce -L 4G /dev/rootvg/tivoli

  WARNING: Reducing active logical volume to 4.00 GiB.

  THIS MAY DESTROY YOUR DATA (filesystem etc.)

Do you really want to reduce rootvg/tivoli? [y/n]: y

  Size of logical volume rootvg/tivoli changed from 8.00 GiB (2048 extents) to 4.00 GiB (1024 extents).

  Logical volume rootvg/tivoli successfully resized.

2.1.4使用xfs文件系统格式化分区

# mkfs.xfs -f /dev/rootvg/tivoli

meta-data=/dev/rootvg/tivoli     isize=512    agcount=4, agsize=262144 blks

         =                       sectsz=512   attr=2, projid32bit=1

         =                       crc=1        finobt=0, sparse=0

data     =                       bsize=4096   blocks=1048576, 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

2.1.5重新挂载分区

# mount /dev/rootvg/tivoli /tivoli

2.1.6使用xfsrestore恢复/tivoli下数据

# xfsrestore -f /app/tivoli.dump /tivoli

xfsrestore: using file dump (drive_simple) strategy

xfsrestore: version 3.1.7 (dump format 3.0) – type ^C for status and control

xfsrestore: searching media for dump

xfsrestore: examining media file 0

xfsrestore: dump description:

xfsrestore: hostname: localhost.localdomain

xfsrestore: mount point: /tivoli

xfsrestore: volume: /dev/mapper/rootvg-tivoli

xfsrestore: session time: Tue May 25 09:29:51 2021

xfsrestore: level: 0

xfsrestore: session label: “tivolidump20210525”

xfsrestore: media label: “tivolidump20210525”

xfsrestore: file system id: 91c5ee30-dd7e-4dbb-a336-6f3e77003f0b

xfsrestore: session id: 50bd343c-6c09-4341-8ecc-434bea9d5006

xfsrestore: media id: 81eef1ca-d96b-4701-86c1-08c8fb9c2cf6

xfsrestore: using online session inventory

xfsrestore: searching media for directory dump

xfsrestore: reading directories

xfsrestore: 84 directories and 235 entries processed

xfsrestore: directory post-processing

xfsrestore: restoring non-directory files

xfsrestore: restore complete: 0 seconds elapsed

xfsrestore: Restore Summary:

xfsrestore:   stream 0 /app/tivoli.dump OK (success)

xfsrestore: Restore Status: SUCCESS

2.1.7检查/tivoli下数据

# ls -l /tivoli

total 4

drwxr-xr-x. 7 1001 1001 4096 Jul 21  2020 zkui

经过上述操作,/tivoli空间已从8GB缩减到4GB。腾出4GB可用空间给rootvg-usr去扩容。

2.2增加/usr空间大小(6GB->10GB)

2.2.1使用lvextend增加逻辑卷到所需的大小

# lvextend -L +4G /dev/rootvg/usr -r

  Size of logical volume rootvg/usr changed from 6.00 GiB (1536 extents) to 10.00 GiB (2560 extents).

  Logical volume rootvg/usr successfully resized.

meta-data=/dev/mapper/rootvg-usr isize=512    agcount=4, agsize=393216 blks

         =                       sectsz=512   attr=2, projid32bit=1

         =                       crc=1        finobt=0 spinodes=0

data     =                       bsize=4096   blocks=1572864, imaxpct=25

         =                       sunit=0      swidth=0 blks

naming   =version 2              bsize=4096   ascii-ci=0 ftype=1

log      =internal               bsize=4096   blocks=2560, version=2

         =                       sectsz=512   sunit=0 blks, lazy-count=1

realtime =none                   extsz=4096   blocks=0, rtextents=0

data blocks changed from 1572864 to 2621440

2.2.2查看/usr空间大小

# df -Th /usr

Filesystem             Type  Size  Used Avail Use% Mounted on

/dev/mapper/rootvg-usr xfs    10G  1.5G  8.5G  16% /usr

发现/usr空间已从6GB增加到10GB。

分区调整后的空间如图示。

三、参考文章

3.1HOW TO REDUCE / SHRINK THE SIZE OF A LVM PARTITION FORMATTED WITH XFS FILESYSTEM?

https://yallalabs.com/linux/how-to-reduce-shrink-the-size-of-a-lvm-partition-formatted-with-xfs-filesystem/

3.2How to Extend a Logical Volume in LVM – for XFS, ext4 and swap filesystem

https://www.thegeeksearch.com/how-to-extend-a-logical-volume-in-lvm-for-xfs-ext4-and-swap-filesystem/

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