VMware不关机扩容linux磁盘

注意在部分OS下，可能在扩容前 Disk 的相关 partition 信息在fdisk中是可以正常识别的，但是在 vsphere / esxi 对磁盘进行扩容以后

就发现 partition 丢了(特别是centos7.9 + fdisk -l + GPT)

这时候可以直接 parted /dev/sda

进入以后应该就会提示

Error: The backup GPT table is not at the end of the disk, as it should be.  This might mean that
another operating system believes the disk is smaller.  Fix, by moving the backup to the end (and
removing the old backup)?

直接进行Fix并扩容即可

也找到原本的扇区记录，然后进入fdisk ，修改 partition table 为 GPT，根据相关扇区记录，把分区重新建立回来即可

lvm类型的分区

1. vm层面完成磁盘扩容
2. 有时候会碰到vm无法感知到disk容量变化的情况出现，这时候需要手动rescan一下 echo 1 > /sys/class/block/sda/device/rescan
3. fdisk -l /dev/sda
4. 使用fdisk /dev/sda 删除重建需要扩容的分区(增大分区容量,保留原本的LVM2_member signature, 起始扇区与原本一致)
5. partprobe /dev/sda
6. pvresize /dev/sda3
7. lvextend /dev/cl/root /dev/sda3
8. xfs_growfs /dev/mapper/cl-root
9. 完成。。

vm disk as mount point

1. vm层面完成磁盘扩容
2. 同样手动rescan一下 echo 1 > /sys/class/block/sda/device/rescan
3. 根据文件系统类型执行fs扩容，如xfs_growfs / resize2fs
4. 例如⬇️

[root@192-168-157-39 ~]# lsblk /dev/sdb
NAME MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sdb    8:16   0  150G  0 disk /var/lib/containers
[root@192-168-157-39 ~]# echo 1 > /sys/class/block/sdb/device/rescan
[root@192-168-157-39 ~]# lsblk /dev/sdb
NAME MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sdb    8:16   0  155G  0 disk /var/lib/containers
[root@192-168-157-39 ~]# cat /etc/fstab |grep cont
/dev/sdb /var/lib/containers xfs defaults,pquota 0 0
[root@192-168-157-39 ~]# xfs_growfs /dev/sdb
meta-data=/dev/sdb               isize=512    agcount=4, agsize=9830400 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=39321600, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=19200, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 39321600 to 40632320
[root@192-168-157-39 ~]# df -h /var/lib/containers
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb        155G   19G  137G  12% /var/lib/containers
[root@192-168-157-39 ~]# lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0   50G  0 disk
├─sda1            8:1    0 1019M  0 part /boot
└─sda2            8:2    0   49G  0 part
  └─centos-root 253:0    0   49G  0 lvm  /
sdb               8:16   0  155G  0 disk /var/lib/containers
sr0              11:0    1  9.5G  0 rom
[root@192-168-157-39 ~]#

额外延伸：How to scan\detect new LUN’s & SCSI disks in Linux?