【LVM】LVM自动扩容脚本

概要说明：

• /dev/mapper/vg0-data挂载在目录/data下；
• 当新增物理磁盘时，需要自动对/dev/mapper/vg0-data磁盘时进行扩容（自动化脚本）；

当新增物理磁盘时，自动扩容到：/dev/vg0/data

---

未新增物理磁盘时的系统情况：

[root@localhost ~]# pvs
  PV         VG     Fmt  Attr PSize  PFree
  /dev/sdb   vg0    lvm2 a--  10.00g    0 
  /dev/sdc   vg0    lvm2 a--  10.00g    0 
[root@localhost ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree
  vg0      2   1   0 wz--n- 19.98g    0 
[root@localhost ~]# lvs
  LV   VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  data vg0    -wi-ao---- 19.98g                                                    
[root@localhost ~]# df -Th
Filesystem              Type      Size  Used Avail Use% Mounted on
/dev/mapper/vg0-data    ext3       19G   52M   18G   1% /data

---

新增物理磁盘：

新添加了两块物理磁盘，分别为/dev/sdd 和/dev/sde，希望执行自动扩容脚本后，可以对/dev/vg0/data扩容；

下面是扩容后的结果：

[root@localhost ~]# pvs
  PV         VG     Fmt  Attr PSize  PFree
  /dev/sdb   vg0    lvm2 a--  10.00g    0 
  /dev/sdc   vg0    lvm2 a--  10.00g    0 
  /dev/sdd   vg0    lvm2 a--  15.00g    0 
  /dev/sde   vg0    lvm2 a--  15.00g    0 
[root@localhost ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree
  vg0      4   1   0 wz--n- 49.98g    0 
[root@localhost ~]# lvs
  LV   VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  data vg0    -wi-ao---- 49.98g                                                    
[root@localhost ~]# df -Th
Filesystem              Type      Size  Used Avail Use% Mounted on
/dev/mapper/vg0-data    ext3       50G   52M   47G   1% /data

---

自动LVM扩展脚本如下：

• 该脚本会自动比对哪些物理磁盘没有进行LVM扩展，并将未扩展的磁盘扩展到/dev/vg0/data；
• 不会扩展sda和hda磁盘；

#!/bin/bash
#################################################
# Create by ssslinppp
# 201699 15:16:58
##################################################
log_file_extendLvm="/data/logs/log_file_extendLvm.log"
echo "====================================================" > $log_file_extendLvm
echo "Begin to extendLVM at `date "+%Y-%m-%d %H:%M:%S"`" >> $log_file_extendLvm
vg_name="vg0"
lv_name="/dev/vg0/data"
fdisk_info="/data/fdisk_info"
pvs_info="/data/pvs_info"
diffSet="/data/diffSet"
displayInfo()
{
	echo "---cmd: df -Th--------------------- " >> $log_file_extendLvm
    df -Th /data >> $log_file_extendLvm 2>&1
    echo "---cmd: pvs------------------------ " >> $log_file_extendLvm
    pvs >> $log_file_extendLvm 2>&1
    echo "---------------------------- " >> $log_file_extendLvm
}
getUnLvmDisk()
{
	fdisk -l | grep /dev/[sh]d.: | awk -F ' ' '{print $2}' | awk -F ':' '{print $1}' > $fdisk_info
	# pvs | grep /dev/[sh]d. | awk -F ' ' '{print $1}' > $pvs_info
	pvscan | grep /dev/[sh]d. | awk -F ' ' '{print $2}' > $pvs_info
	#get Difference set
	# sort $fdisk_info $pvs_info $pvs_info | uniq -u > $diffSet
	grep -F -v -f $pvs_info $fdisk_info > $diffSet
    echo "-----------------------------" >> $log_file_extendLvm
	echo "fdisk_info is :" >> $log_file_extendLvm
	cat $fdisk_info >> $log_file_extendLvm
	echo "pvs_info is :" >> $log_file_extendLvm
	cat $pvs_info >> $log_file_extendLvm
	echo "diffSet is:" >> $log_file_extendLvm
	cat $diffSet >> $log_file_extendLvm
	echo "----------------------------" >> $log_file_extendLvm
	rm -rf $fdisk_info
	rm -rf $pvs_info
}
extendLV()
{
	# example: change "sdb" to "/dev/sdb"
	dev_disk=`echo $dev_disk|sed '/dev/!s/^/\/dev\//'`
	if [ ! -e $dev_disk ];then 
  		echo "[ERROR] $dev_disk do not exists" >> $log_file_extendLvm
  		echo "error"
  		exit -1
	fi
	if [ `pvs | grep $dev_disk | wc -l` = "1" ];then
  		echo "[ERROR] $dev_disk(as PE) has already extend to $vg_name" >> $log_file_extendLvm
  		echo "error"
  		exit -2
	fi
    # step 1 :extend vg
    echo "step 1- exec cmd: vgextend vg0 $dev_disk" >> $log_file_extendLvm
    vgextend -f vg0 $dev_disk >> $log_file_extendLvm 2>&1
    # step 2 :extend lv
    echo "step 2- exec cmd: lvextend -l 100%VG $lv_name" >> $log_file_extendLvm
    lvextend -l 100%VG $lv_name >> $log_file_extendLvm 2>&1
    # step 3: resize2fs /dev/vg0/data
    echo "step 3- exec cmd: resize2fs $lv_name" >> $log_file_extendLvm
    resize2fs $lv_name >> $log_file_extendLvm 2>&1
}
# display info
echo "Before extendLVM..." >> $log_file_extendLvm
displayInfo
getUnLvmDisk
cat  $diffSet | while read dev_disk
do
	if [ $dev_disk != "/dev/sda" ] && [ $dev_disk != "/dev/hda" ] && [ `echo $dev_disk | wc -L` == 8 ];then
		# exec extendLVM
		# echo "+++++++++++++++++ [$dev_disk]"
		extendLV
	fi
done
# display info
echo "After extendLVM... " >> $log_file_extendLvm
displayInfo
echo "extendLVM finish success" >> $log_file_extendLvm
echo "success"

来自为知笔记(Wiz)

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