lvm 通过增加新硬盘扩容逻辑卷

迷南。 2022-01-17 00:41 547阅读 0赞

ls /dev/sda >/dev/null 2>&1;  
if \[ $? = 0 \]; then  
/sbin/pvcreate /dev/sda  
/sbin/vgcreate domuvg /dev/sda  
/sbin/lvcreate -L 1G -n swap domuvg  
/sbin/mkswap /dev/domuvg/swap  
/sbin/swapon /dev/domuvg/swap  
echo "/dev/domuvg/swap swap swap defaults 0 0" >> /etc/fstab  
  
mkdir -p /alidata  
/sbin/lvcreate -l +100%FREE -n alidata domuvg  
/sbin/mkfs.ext4 /dev/domuvg/alidata  
if \[ \`ls -r /alidata |wc -l\` = 0 \]; then  
/bin/mount /dev/domuvg/alidata /alidata  
echo "/dev/domuvg/alidata /alidata ext4 defaults 0 0" >> /etc/fstab  
fi  
  
fi

使用此脚本对/dev/sda做LVM，并且分成2个分区。

场景：sda做了lvm，现在容量不够，需要扩容，新添加了sdb，把sdb的容量扩容到sda里面，增加sda的容量。

1、查看现在物理卷情况  
\[root@localhost ~\]\# pvdisplay  
\--- Physical volume ---  
PV Name /dev/sda  
VG Name domuvg  
PV Size 8.00 GiB / not usable 4.00 MiB  
Allocatable yes (but full)  
PE Size 4.00 MiB  
Total PE 2047  
Free PE 0  
Allocated PE 2047  
PV UUID v8b8aP-6Lq6-I3gR-f1p6-89nu-Bk67-tPA5hh  
  
2、针对sdb建立物理卷  
\[root@localhost ~\]\# pvcreate /dev/sdb  
Physical volume "/dev/sdb" successfully created  
  
3、查看现在物理卷情况  
\[root@localhost ~\]\# pvdisplay  
\--- Physical volume ---  
PV Name /dev/sda  
VG Name domuvg  
PV Size 8.00 GiB / not usable 4.00 MiB  
Allocatable yes (but full)  
PE Size 4.00 MiB  
Total PE 2047  
Free PE 0  
Allocated PE 2047  
PV UUID v8b8aP-6Lq6-I3gR-f1p6-89nu-Bk67-tPA5hh  
  
"/dev/sdb" is a new physical volume of "5.00 GiB"  
\--- NEW Physical volume ---  
PV Name /dev/sdb  
VG Name  
PV Size 5.00 GiB  
Allocatable NO  
PE Size 0  
Total PE 0  
Free PE 0  
Allocated PE 0  
PV UUID yOWwty-2dfz-5DN4-aSgH-VijX-1LAT-fb8irp  
  
4、添加sdb到现在的卷组中  
\[root@localhost ~\]\# vgextend domuvg /dev/sdb  
Volume group "domuvg" successfully extended  
  
5、查看现在物理卷情况  
\[root@localhost ~\]\# pvdisplay  
\--- Physical volume ---  
PV Name /dev/sda  
VG Name domuvg  
PV Size 8.00 GiB / not usable 4.00 MiB  
Allocatable yes (but full)  
PE Size 4.00 MiB  
Total PE 2047  
Free PE 0  
Allocated PE 2047  
PV UUID v8b8aP-6Lq6-I3gR-f1p6-89nu-Bk67-tPA5hh  
  
\--- Physical volume ---  
PV Name /dev/sdb  
VG Name domuvg  
PV Size 5.00 GiB / not usable 4.00 MiB  
Allocatable yes  
PE Size 4.00 MiB  
Total PE 1279  
Free PE 1279  
Allocated PE 0  
PV UUID yOWwty-2dfz-5DN4-aSgH-VijX-1LAT-fb8irp  
  
  
6、查看卷组的情况  
\[root@localhost ~\]\# vgdisplay  
\--- Volume group ---  
VG Name domuvg  
System ID  
Format lvm2  
Metadata Areas 2  
Metadata Sequence No 4  
VG Access read/write  
VG Status resizable  
MAX LV 0  
Cur LV 2  
Open LV 2  
Max PV 0  
Cur PV 2  
Act PV 2  
VG Size 12.99 GiB  
PE Size 4.00 MiB  
Total PE 3326  
Alloc PE / Size 2047 / 8.00 GiB  
Free PE / Size 1279 / 5.00 GiB  
VG UUID VJ4tsH-IFB3-Ft1O-Rnxc-nFfw-hDNE-ggB0Az  
  
7、扩展lv的容量  
\[root@localhost ~\]\# lvextend -l +100%FREE /dev/domuvg/alidata \#全部扩容到/dev/domuvg/alidata此逻辑卷上  
Size of logical volume domuvg/alidata changed from 7.00 GiB (1791 extents) to 11.99 GiB (3070 extents).  
Logical volume alidata successfully resized  
  
8、查看容量  
\[root@localhost ~\]\# df -Ph  
Filesystem Size Used Avail Use% Mounted on  
/dev/sdc2 7.3G 1.1G 5.9G 15% /  
tmpfs 939M 0 939M 0% /dev/shm  
/dev/mapper/domuvg-alidata 6.8G 16M 6.4G 1% /alidata \#大小没有扩容  
  
9、使用resize2fs扩容  
\[root@localhost ~\]\# resize2fs /dev/domuvg/alidata  
resize2fs 1.41.12 (17-May-2010)  
Filesystem at /dev/domuvg/alidata is mounted on /alidata; on-line resizing required  
old desc\_blocks = 1, new\_desc\_blocks = 1  
Performing an on-line resize of /dev/domuvg/alidata to 3143680 (4k) blocks.  
The filesystem on /dev/domuvg/alidata is now 3143680 blocks long.  
  
\[root@localhost ~\]\# df -Ph  
Filesystem Size Used Avail Use% Mounted on  
/dev/sdc2 7.3G 1.1G 5.9G 15% /  
tmpfs 939M 0 939M 0% /dev/shm  
/dev/mapper/domuvg-alidata 12G 18M 12G 1% /alidata  
由最初的8G扩容到了12G，增加了5G。

转载于:https://blog.51cto.com/myunix/1700869