How to extend logical volume space (给逻辑卷扩展空间)
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How to extend logical volume space (给逻辑卷扩展空间)
1. 新增硬盘
在VM上给相应客户机添加新硬盘(本次新增的硬盘空间为100G)
在客户机上操作/proc/scsi/scsi文件,使硬盘能够被认到(如果可以重启,请或略此步骤)
[root@hz-jenkins scsi]# pwd/proc/scsi[root@hz-jenkins scsi]# echo "scsi add-single-device 2 0 1 0" > /proc/scsi/scsi# 查看 scsi文件,最后那个设备就是新增的[root@hz-jenkins scsi]# cat scsiAttached devices:Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: NECVMWar Model: VMware IDE CDR10 Rev: 1.00 Type: CD-ROM ANSI SCSI revision: 05Host: scsi2 Channel: 00 Id: 00 Lun: 00 Vendor: VMware Model: Virtual disk Rev: 1.0 Type: Direct-Access ANSI SCSI revision: 02Host: scsi2 Channel: 00 Id: 01 Lun: 00 Vendor: VMware Model: Virtual disk Rev: 1.0 Type: Direct-Access ANSI SCSI revision: 02
备注:
“scsi add-single-device x y z u”中,x, y, z, u 分别是指以下的2 0 1 0
Host: scsi2 Channel: 00 Id: 01 Lun: 00
检查是否成功,可以通过fdisk -l或者查看/dev/sd?进行查看
[root@hz-jenkins scsi]# fdisk -l..Disk /dev/sdb: 100 GiB, 107374182400 bytes, 209715200 sectors..[root@hz-jenkins scsi]# ll /dev/sd?brw-rw---- 1 root disk 8, 0 Dec 1 11:01 /dev/sdabrw-rw---- 1 root disk 8, 16 Dec 1 16:35 /dev/sdb[root@hz-jenkins scsi]# fdisk -l
2. 创建硬盘分区
(此处建3个主分区,Type为8e,大小分别为40G, 40G, 20G,目的是为了空间不用时可以收回)
[root@hz-jenkins scsi]# fdisk /dev/sdb..# 创建后,可以看到/dev/sdb1,2,3三个块文件[root@hz-jenkins scsi]# ll /dev/sdb*brw-rw---- 1 root disk 8, 16 Dec 1 16:42 /dev/sdbbrw-rw---- 1 root disk 8, 17 Dec 1 16:43 /dev/sdb1brw-rw---- 1 root disk 8, 18 Dec 1 16:43 /dev/sdb2brw-rw---- 1 root disk 8, 19 Dec 1 16:43 /dev/sdb3
3. 创建PV
[root@hz-jenkins ~]# pvcreate /dev/sdb? Physical volume "/dev/sdb1" successfully created Physical volume "/dev/sdb2" successfully created Physical volume "/dev/sdb3" successfully created[root@hz-jenkins ~]# pvdisplay..."/dev/sdb3" is a new physical volume of "20.00 GiB"--- NEW Physical volume ---PV Name /dev/sdb3VG Name PV Size 20.00 GiBAllocatable NOPE Size 0 Total PE 0Free PE 0Allocated PE 0PV UUID ApvQgx-olTW-dODR-jztk-0NZJ-HnZa-Tp1d9L.."/dev/sdb2" is a new physical volume of "40.00 GiB".."/dev/sdb1" is a new physical volume of "40.00 GiB"..
创建PV后,可以通过pvdisplay查看到新增的3个pv的详细信息
4. 扩展VG
[root@hz-jenkins scsi]# vgextend fedora /dev/sdb[1-3] Volume group "fedora" successfully extended[root@hz-jenkins scsi]# vgdisplay.. VG Size 199.50 GiB PE Size 4.00 MiB Total PE 51071 Alloc PE / Size 25474 / 99.51 GiB Free PE / Size 25597 / 99.99 GiB VG UUID XGkRbq-lWNj-6jVp-1T52-eaEi-2yGC-guOm75[root@hz-jenkins scsi]#
扩展后,通过vgdisplay命令可以看到,新增的Free Size 为99.99GiB
5. 扩展LV
通过 pvdisplay, vgdisplay 可以查看有多少空间(或多少PE数)可以使用
[root@hz-jenkins scsi]# pvdisplay.. --- Physical volume --- PV Name /dev/sdb1 VG Name fedora PV Size 40.00 GiB / not usable 4.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 10239 Free PE 10239 Allocated PE 0 PV UUID KRvzJZ-l7xp-IdrL-3QbQ-8bHN-sPnU-OWSy7G --- Physical volume --- PV Name /dev/sdb2 Total PE 10239 Free PE 10239 Allocated PE 0.. --- Physical volume --- PV Name /dev/sdb3 Total PE 5119 Free PE 5119 Allocated PE 0..
接下去进行lv扩展,使用lvresize命令(此处先扩大40G,按/dev/sdb1的大小10239个PE)
[root@hz-jenkins scsi]# lvresize -l +10239 /dev/fedora/home Extending logical volume home to 59.53 GiB Logical volume home successfully resized[root@hz-jenkins scsi]# df -vh
使用resize2fs命令,使lv空间更改生效
[root@hz-jenkins scsi]# df -vh /homeFilesystem Size Used Avail Use% Mounted on/dev/mapper/fedora-home 20G 18G 546M 98% /home[root@hz-jenkins scsi]# resize2fs /dev/fedora/homeresize2fs 1.42.12 (29-Aug-2014)Filesystem at /dev/fedora/home is mounted on /home; on-line resizing requiredold_desc_blocks = 2, new_desc_blocks = 4The filesystem on /dev/fedora/home is now 15604736 (4k) blocks long.[root@hz-jenkins scsi]# df -vh /homeFilesystem Size Used Avail Use% Mounted on/dev/mapper/fedora-home 59G 18G 39G 32% /home#
备注:
以上vg name: fedora, lv name: home命名不是很好
一般vg name用vg_开头,lv name用lv_开头,所以更好的命名应该为 vg_fedora, lv_home
把剩下的60G(/dev/sdb2, /dev/sdb3)也扩进/home
10239+5119=15358
[root@hz-jenkins ~]# lvresize -l +15358 /dev/fedora/home Extending logical volume home to 119.52 GiB Logical volume home successfully resized[root@hz-jenkins ~]# df -vh /homeFilesystem Size Used Avail Use% Mounted on/dev/mapper/fedora-home 59G 18G 39G 32% /home[root@hz-jenkins ~]# resize2fs /dev/fedora/homeresize2fs 1.42.12 (29-Aug-2014)Filesystem at /dev/fedora/home is mounted on /home; on-line resizing requiredold_desc_blocks = 4, new_desc_blocks = 8The filesystem on /dev/fedora/home is now 31331328 (4k) blocks long.[root@hz-jenkins ~]# df -vh /homeFilesystem Size Used Avail Use% Mounted on/dev/mapper/fedora-home 118G 18G 95G 16% /home[root@hz-jenkins ~]#
参考文档:
1. LVM 理论与实践
http://vbird.dic.ksu.edu.tw/linux_basic/0420quota_3.php
2. Linux不重启添加识别硬盘
http://www.myhack58.com/Article/48/66/2015/66573.htm
http://blog.itpub.net/7348112/viewspace-765000/
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