最近接到經理要求對RHEL7的LVM新分區擴容自動化，因為使用的是虛擬化平臺，故采用添加新磁盤的方式來做：

#!/bin/bash

##在線掃描新磁盤
##Step1: Recognize New Hard Disk##
Logdir=~/disk_log

if [ ! -d $Logdir ];then
	mkdir -p $Logdir
fi

SCSIHost=`ls -l /sys/class/scsi_host/ | grep "host" | tr -s " " | cut -d" " -f9`

for host in $SCSIHost
	do
		sudo echo "- - -" | sudo tee /sys/class/scsi_host/$host/scan >/dev/null 2>&1
 
	done

if [ $? -eq 0 ];then
        echo "`date  +"%Y/%m/%d %T %Z %:::z"`: Step1 -> SCSI Disk Rescanning is Successful" >> $Logdir/log_$HOSTNAME.txt
else
	echo "`date  +"%Y/%m/%d %T %Z %:::z"`: Step1 -> SCSI Disk Rescanning is Faied, Script is Interrupted" >> $Logdir/log_$HOSTNAME.txt
fi

##創建新的磁盤分區
 
##Step2: Create New Disk Partition##
NewSD=`sudo fdisk -l | grep "Disk /dev/sd"  | sort | tail -1 | cut -d" " -f2 | cut -d":" -f1`

sudo fdisk $NewSD <<EOF
n
p
1

t
8e
wq
EOF

if [ $? -eq 0 ];then
        echo "`date  +"%Y/%m/%d %T %Z %:::z"`: Step2 -> SCSI Disk Partition Creation is Successful" >> $Logdir/log_$HOSTNAME.txt
 
else
	echo "`date  +"%Y/%m/%d %T %Z %:::z"`: Step2 -> SCSI Disk Partition Creation is Faied, Script is Interrupted" >> $Logdir/log_$HOSTNAME.txt
	exit
fi

##LVM在線擴容
##Step3: Extend Disk by LVM##
NewPV=`sudo fdisk -l | grep ^$NewSD | cut -d" " -f1`
VG=`sudo vgs | tail -1 | awk ‘{print$1}‘`
LVRoot=`sudo lvscan | grep ACTIVE | grep root | cut -d"‘" -f2`
sudo pvcreate $NewPV && sudo vgextend $VG $NewPV

if [ $? -eq 0 ];then
	echo "`date  +"%Y/%m/%d %T %Z %:::z"`: Step3 -> VG Exention is Successful" >> $Logdir/log_$HOSTNAME.txt
	sudo lvextend -r -l +100%FREE $LVRoot
else
	echo "`date  +"%Y/%m/%d %T %Z %:::z"`: Step3 -> VG Exention is Failed" >> $Logdir/log_$HOSTNAME.txt
	exit
fi

if [ $? -eq 0 ];then
        echo "`date  +"%Y/%m/%d %T %Z %:::z"`: Step3 -> LV and File System Extention is Successful" >> $Logdir/log_$HOSTNAME.txt
else
	echo "`date  +"%Y/%m/%d %T %Z %:::z"`: Step3 -> LV and File System Extention is Faied, Script is Interrupted" >> $Logdir/log_$HOSTNAME.txt
	exit
fi

exit 0

目前采用的添加新磁盤後，手動運行腳本，個人認為可以添加條件判斷語句，放到crontab，這樣以後只需配合外部工具，客戶可以實現自動添加新磁盤和擴容。

目前暫時只能想到這個方式，希望能得到各位的指正，讓我能優化這個腳本，增強其移植性和容錯性。

本文出自 “那美克星” 博客，請務必保留此出處http://yangqiao.blog.51cto.com/5542284/1925253

Shell腳本一鍵擴展LVM新分區