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【LVM】LVM自动扩容脚本

2024-08-12 19:03:29   218人阅读

当新增物理磁盘时，自动扩容到：/dev/vg0/data
例如，如下是原始的：
  1. [root@localhost ~]# pvs
  2.   PV         VG     Fmt  Attr PSize  PFree
  3.   /dev/sdb   vg0    lvm2 a--  10.00g    0 
  4.   /dev/sdc   vg0    lvm2 a--  10.00g    0 
  6. [root@localhost ~]# vgs
  7.   VG     #PV #LV #SN Attr   VSize  VFree
  8.   vg0      2   1   0 wz--n- 19.98g    0 
  10. [root@localhost ~]# lvs
  11.   LV   VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  12.   data vg0    -wi-ao---- 19.98g                                                    
  14. [root@localhost ~]# df -Th
  15. Filesystem              Type      Size  Used Avail Use% Mounted on
  16. /dev/mapper/vg0-data    ext3       19G   52M   18G   1% /data
如果添加了物理磁盘，该脚本会自动比对哪些物理磁盘没有进行LVM扩展，并将未LVM扩展的磁盘扩展到/dev/vg0/data。
比如，新添加了两块物理磁盘，分别为/dev/sdd 和/dev/sde，执行该脚本后的结果：
  1. [root@localhost ~]# pvs
  2.   PV         VG     Fmt  Attr PSize  PFree
  3.   /dev/sdb   vg0    lvm2 a--  10.00g    0 
  4.   /dev/sdc   vg0    lvm2 a--  10.00g    0 
  5.   /dev/sdd   vg0    lvm2 a--  15.00g    0 
  6.   /dev/sde   vg0    lvm2 a--  15.00g    0 
  8. [root@localhost ~]# vgs
  9.   VG     #PV #LV #SN Attr   VSize  VFree
  10.   vg0      4   1   0 wz--n- 49.98g    0 
  12. [root@localhost ~]# lvs
  13.   LV   VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  14.   data vg0    -wi-ao---- 49.98g                                                    
  16. [root@localhost ~]# df -Th
  17. Filesystem              Type      Size  Used Avail Use% Mounted on
  18. /dev/mapper/vg0-data    ext3       50G   52M   47G   1% /data
自动LVM扩展脚本如下：
  1. #!/bin/bash
  3. #################################################
  4. # Create by ssslinppp
  5. # 201699 15:16:58
  6. ##################################################
  8. log_file_extendLvm="/data/logs/log_file_extendLvm.log"
  9. echo "====================================================" > $log_file_extendLvm
  10. echo "Begin to extendLVM at `date "+%Y-%m-%d %H:%M:%S"`" >> $log_file_extendLvm
  12. vg_name="vg0"
  13. lv_name="/dev/vg0/data"
  15. fdisk_info="/data/fdisk_info"
  16. pvs_info="/data/pvs_info"
  17. diffSet="/data/diffSet"
  19. displayInfo()
  20. {
  21. 	echo "---cmd: df -Th--------------------- " >> $log_file_extendLvm
  22.     df -Th /data >> $log_file_extendLvm 2>&1
  23.     echo "---cmd: pvs------------------------ " >> $log_file_extendLvm
  24.     pvs >> $log_file_extendLvm 2>&1
  25.     echo "---------------------------- " >> $log_file_extendLvm
  26. }
  28. getUnLvmDisk()
  29. {
  30. 	fdisk -l | grep /dev/[sh]d.: | awk -F ‘ ‘ ‘{print $2}‘ | awk -F ‘:‘ ‘{print $1}‘ > $fdisk_info
  31. 	pvs | grep /dev/[sh]d. | awk -F ‘ ‘ ‘{print $1}‘ > $pvs_info
  33. 	#get Difference set
  34. 	sort $fdisk_info $pvs_info $pvs_info | uniq -u > $diffSet
  36.     echo "-----------------------------" >> $log_file_extendLvm
  37. 	echo "fdisk_info is :" >> $log_file_extendLvm
  38. 	cat $fdisk_info >> $log_file_extendLvm
  39. 	echo "pvs_info is :" >> $log_file_extendLvm
  40. 	cat $pvs_info >> $log_file_extendLvm
  41. 	echo "diffSet is:" >> $log_file_extendLvm
  42. 	cat $diffSet >> $log_file_extendLvm
  43. 	echo "----------------------------" >> $log_file_extendLvm
  45. 	rm -rf $fdisk_info
  46. 	rm -rf $pvs_info
  47. }
  49. extendLV()
  50. {
  51. 	# example: change "sdb" to "/dev/sdb"
  52. 	dev_disk=`echo $dev_disk|sed ‘/dev/!s/^/\/dev\//‘`
  54. 	if [ ! -e $dev_disk ];then 
  55.   		echo "[ERROR] $dev_disk do not exists" >> $log_file_extendLvm
  56.   		echo "error"
  57.   		exit -1
  58. 	fi
  60. 	if [ `pvs | grep $dev_disk | wc -l` = "1" ];then
  61.   		echo "[ERROR] $dev_disk(as PE) has already extend to $vg_name" >> $log_file_extendLvm
  62.   		echo "error"
  63.   		exit -2
  64. 	fi
  66.     # step 1 :extend vg
  67.     echo "step 1- exec cmd: vgextend vg0 $dev_disk" >> $log_file_extendLvm
  68.     vgextend -f vg0 $dev_disk >> $log_file_extendLvm 2>&1
  70.     # step 2 :extend lv
  71.     echo "step 2- exec cmd: lvextend -l 100%VG $lv_name" >> $log_file_extendLvm
  72.     lvextend -l 100%VG $lv_name >> $log_file_extendLvm 2>&1
  74.     # step 3: resize2fs /dev/vg0/data
  75.     echo "step 3- exec cmd: resize2fs $lv_name" >> $log_file_extendLvm
  76.     resize2fs $lv_name >> $log_file_extendLvm 2>&1
  77. }
  79. # display info
  80. echo "Before extendLVM..." >> $log_file_extendLvm
  81. displayInfo
  83. getUnLvmDisk
  84. cat  $diffSet | while read dev_disk
  85. do
  86. 	if [ $dev_disk != "/dev/sda" ] && [ `echo $dev_disk | wc -L` == 8 ];then
  87. 		# exec extendLVM
  88. 		extendLV
  89. 	fi
  90. done
  92. # display info
  93. echo "After extendLVM... " >> $log_file_extendLvm
  94. displayInfo
  96. echo "extendLVM finish success" >> $log_file_extendLvm
  98. echo "success"


来自为知笔记(Wiz)


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