![]() Once one or more of the disks are available to LVM as Physical Volumes, the storage capacity is combined into Volume Groups (VGs). This command displays all of the Physical Volumes configured on the server. The second command sets the total capacity of storage disk c as a PV.ĭisplay PV capacity and additional information: # pvdisplay The first command designates partition 1 on storage disk b as a PV. These two command examples are slightly different. To implement LVM, first designate a drive as a Physical Volume.Ĭommand to create a PV: # pvcreate /dev/sdb1 # pvcreate /dev/sdc You can mix and match drive types to create PVs. It is interesting to note that, as opposed to RAID, PVs do not have to be the same size or or on disks that are the same speed. ![]() They have identifiers and metadata that describes each PV. Physical Volumes (PV) are disks or partitions that are available to LVM as potential storage capacity. Just as we saw above, you must physically install a drive in the server. Obviously, there needs to be a storage disk available. Source: Red Hat LVM Architecture Overview 1. Three hard disk drives are combined into one volume group that is then carved into two logical volumes. The VGs are carved into one or more Logical Volumes (LVs), which then are treated as traditional partitions. The PVs are then added to one or more Volume Groups (VGs). This is accomplished by designating the storage disks as Physical Volumes (PV), or storage capacity useable by LVM. With LVM, those same three disks are considered to be 3 TB of aggregated storage capacity. With traditional storage, three 1 TB disks are handled individually. Storage space is managed by combining or pooling the capacity of the available drives. Traditional storage capacity is based on individual disk capacity. ![]() If you need a reminder on /etc/fstab, check out Tyler Carrigan's article An introduction to the Linux /etc/fstab file here on Enable Sysadmin. Configure the space to mount at bootĮdit the /etc/fstab file to mount the filesystem at boot. Note: The -h option displays the output of du in capacity terms that are easy for humans to understand, such as GB or TB.
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