Add a new hard disk and expand the root partition capacity without rebooting in the RHEL7 virtual machine

Add a new 5G hard drive to VMware

Show current partition

# fdisk-l

Usually when you add a new hard disk to a virtual machine, you may see that the new drive is not loaded automatically. This is because the SCSI bus connected to the hard drive needs to be re-scanned to make the new hard drive visible.

Here is a simple command to rescan the SCSI bus and SCSI devices.

Determine the host bus number

# LS /sys/class/scsi_host/

Host0   host11  host14  host17  host2   host22  host25  host28  host30  Host4  host7host1   host12  host15  host18  host20  host23  host26  host29  host31  host5  host8host10  host13  host16  host19  host21  host24  Host27  host3   host32  host6  host9

Re-scan the SCSI bus to add devices

#  For I in $ (ls/sys/class/scsi_host/), do echo "---" > /sys/class/SC Si_host/$i/scan; Done

Re-display the partition. This time found that the new hard drive has been automatically loaded.

# fdisk -l

...    5368536870912010485760   sectors1  + bytessector size (logical  bytesi bytes

Display the filesystem, you can see that the root partition of the VG is RHEL,VL is root, the partition type is XFS

# DF-HT

Filesystem Type Size used Avail use%mounted on/dev/mapper/rhel-root XFS 4. 0G 1. 8G 2. 3G /Devtmpfs Devtmpfs 227M0227M0% /Devtmpfs Tmpfs 237M0237M0%/dev/Shmtmpfs Tmpfs 237M8.5M229M4% /Runtmpfs Tmpfs 237M0237M0%/sys/fs/Cgroup/DEV/SDA1 XFS 497M 168M 329M the% /Boottmpfs Tmpfs 48M058,0%/run/user/0

Build/dev/sda2 as PV

# PVCREATE/DEV/SDB

" /dev/sdb " successfully created

Since the system already has Vg:rhel, the new PV is added to this VG directly.

# Vgextend Rhel/dev/sdb

" Rhel " successfully extended

Add 5G of space to Vl:root

# lvextend-l +5g/dev/rhel/root

  3.97 Gib (10168.97 Gib (2296  extents).  Logical volume root successfully resized.

Add the remaining space to the Vl:root

# lvextend-l +100%free/dev/rhel/root

  8.97 Gib (22969.00 Gib (2305  extents).  Logical volume root successfully resized.

The modified configuration needs to be activated after LV expansion

# Xfs_growfs/dev/rhel/root

Meta-data=/dev/mapper/rhel-root isize= theAgcount=4, agsize=260096Blks= sectsz= +Attr=2, projid32bit=1= crc=0finobt=0Data= bsize=4096blocks=1040384, imaxpct= -= sunit=0Swidth=0blksnaming=version2Bsize=4096Ascii-ci=0Ftype=0Log=internal bsize=4096blocks=2560, version=2= sectsz= +sunit=0Blks, lazy-count=1Realtime=none extsz=4096blocks=0, rtextents=0data blocks changed from1040384To2360320

Re-display the file system, you can see the root partition size increased from 4G to 9G

# DF-HT

Filesystem Type Size used Avail use%mounted on/dev/mapper/rhel-root XFS 9. 0G 1. 8G 7. 3G /Devtmpfs Devtmpfs 227M0227M0% /Devtmpfs Tmpfs 237M0237M0%/dev/Shmtmpfs Tmpfs 237M8.5M229M4% /Runtmpfs Tmpfs 237M0237M0%/sys/fs/Cgroup/DEV/SDA1 XFS 497M 168M 329M the% /Boottmpfs Tmpfs 48M058,0%/run/user/0

Add a new hard disk and expand the root partition capacity without rebooting in the RHEL7 virtual machine