【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

[/code]新增物理磁盘：[/b]
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

[/code]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"

[/code]

来自为知笔记(Wiz)

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