{"id":184,"date":"2018-11-02T11:20:09","date_gmt":"2018-11-02T05:50:09","guid":{"rendered":"https:\/\/liai.co.in\/blog\/?p=184"},"modified":"2021-10-27T13:57:49","modified_gmt":"2021-10-27T13:57:49","slug":"linux-lvm-brief-description-on-few-common-day-to-day-concepts","status":"publish","type":"post","link":"https:\/\/www.liainfraservices.com\/blog\/linux-lvm-brief-description-on-few-common-day-to-day-concepts\/","title":{"rendered":"Linux LVM | Brief description on few common day to day concepts"},"content":{"rendered":"<\/span> 6<\/span> min read<\/span><\/span>
<\/span> 4,403<\/span><\/div>

<\/h4>\n

Linux LVM creation<\/strong><\/em><\/h4>\n

Logical Volume Manager is a device mapping technology that provides the flexibility to expand and shrink the size of storage as per the requirement.<\/span><\/p><\/blockquote>\n

To create LVM, there are certain steps. Unlike RAID, it does not require same sized disk.<\/span><\/p>\n

It takes few physical volumes and makes a volume group out of it and then creates LVM from that volume group.<\/span><\/p>\n

Physical Volumes (eg: \/dev\/sdb1, \/dev\/sdc1 etc)\u00a0 —-> Volume Group\u00a0 —-> LVM<\/span><\/strong><\/p>\n

Note<\/span><\/strong>: We can create LVM using a single disk or using multiple disks.<\/span><\/p>\n

Let’s get started with some practical approach. You can follow the steps or if you are an advanced user, you can skip few steps and directly move to the command that interests you the most.<\/em><\/span><\/p>\n

\"\"<\/a><\/p>\n

<\/p>\n

\"Linux<\/p>\n

Log in to the Linux Server <\/span><\/p>\n

\"\"<\/p>\n

Check the disk attached to the server<\/span><\/p>\n

fdisk -l<\/span><\/p>\n

Based on the attached disk, you may get an output similar to the below<\/span><\/p>\n

Where \/dev\/sdc is a disk attached, but note: It does not have any partition (Disk \/dev\/sdc doesn’t contain a valid partition table)<\/span><\/p>\n

\"lvm<\/p>\n

\"\"Now, we have to create a partition and after that, we have to format that using appropriate filesystem type like ext3, ext4 etc but for LVM we have to make sure, we should NOT format the partition using any of the above filesystems.<\/span><\/p>\n

We have to set the as LVM.<\/span><\/p>\n

Process1: Make a partition of “\/dev\/sdc”<\/strong><\/h6>\n

fdisk \/dev\/sdc<\/p>\n

This will give you a prompt to enter some value.<\/span><\/p>\n

For help simply type \u201cm\u201d<\/span> and that would leave you with multiple options.<\/span><\/p>\n

For making \u201cnew\u201d partition, type \u201cn\u201d<\/span><\/span><\/p>\n

Select \u201cp\u201d<\/span> for Primary<\/span><\/p>\n

You can select 4 primary partitions<\/span><\/p>\n

\"\"<\/p>\n

\"\"After selecting \u201cp\u201d<\/span> select 1<\/span> for the first partition.<\/span><\/p>\n

Then give a size to the partition (+5G= 5GB)<\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"This will create the 1st partition with 5GB storage.<\/span><\/p>\n

If you have more space remained on the disk, you can create the 2nd partition the same way(p,2)<\/span><\/p>\n

Now as the partition is created, we have to make those partitions as LVM <\/span><\/p>\n

Now, we need to assign LVM to the partition, so we have to select that partition first.<\/span><\/p>\n

\"\"<\/p>\n

Type \u201ct\u201d<\/span> \u2192 Type<\/span><\/p>\n

Select partition \u2192 1<\/span><\/span><\/p>\n

List the items —> l<\/span><\/span><\/p>\n

\"\"<\/p>\n

From the above, we find the LVM has hexacode as 8e<\/span>.<\/span><\/p>\n

So, we will select that.<\/span><\/p>\n

That will give us the below message \u201cChanged system type of partition 1 to 8e (Linux LVM)\u201d<\/span><\/p>\n

\"\"<\/p>\n

\"\"Now, we have to write those changes to the disk, so we will use the option \u201cw\u201d<\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"Now, if you type fdisk -l<\/span>, you can see these two LVM partitions for \/dev\/sdc<\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"Now, we can use these disk partitions to create LVM.<\/span><\/p>\n

LVM creation process includes <\/strong><\/p>\n