\t\t\t\tCreating Logical Volumes
\n 1.
\n Prepare underlying block devices
\n Can use partitions of type 0x8e or software RAID devices
\n 2.
\n Create physical volumes
\n # pvcreate \/dev\/hda3
\n 3.
\n Create volume group containing physical volume
\n # vgcreate vg0 \/dev\/hda3
\n 4.
\n Create logical volumes inside volume groups
\n # lvcreate -L 256M -n data vg0
\n 5.
\n Format and mount logical volume (\/dev\/vg0\/data)<\/p>\n
Resizing Logical Volumes
\n Growing logical volumes and filesystems
\n lvextend can grow logical volumes
\n resize2fs can grow ext3 filesystems online or offline
\n Shrinking filesystems and logical volumes
\n Must be done offline (umount)
\n Requires a filesystem check (e2fsck) first
\n Filesystem then reduced (resize2fs)
\n Lastly, lvreduce can then reduce the volume<\/p>\n
Resizing Volume Groups
\n Volume Groups can be enlarged with:
\n # vgextend vg0 \/dev\/sdb1
\n Volume Groups can be reduced with:
\n # pvmove \/dev\/hda3
\n # vgreduce vg0 \/dev\/hda3<\/p>\n
Logical Volume Manager Snapshots
\n Snapshots are special Logical Volumes that are an exact copy of an existing Logical Volume at the time the snapshot is created
\n Snapshots are perfect for backups and other operations where a temporary copy of an existing dataset is needed
\n Snapshots only consume space where they are different from the original Logical Volume
\n Snapshots are allocated space at creation but do not use it until changes are made to the original Logical Volume or the Snapshot
\n When data is changed on the original Logical Volume the older data is copied to the Snapshot
\n Snapshots contain only data that has changed on the original Logical Volume or the Snapshot since the Snapshot was created. <\/p>\n
Using LVM Snapshots
\n1. Create snapshot of existing Logical Volume
\n # lvcreate -l 64 -s -n datasnap \/dev\/vg0\/data
\n2. Mount snapshot
\n # mkdir -p \/mnt\/datasnap
\n # mount -o ro \/dev\/vg0\/datasnap \/mnt\/datasnap
\n3. Perform backup
\n4. Remove snapshot
\n # umount \/mnt\/datasnap
\n # lvremove \/dev\/vg0\/datasnap\t\t<\/p>\n","protected":false},"excerpt":{"rendered":"
Creating Logical Volumes 1. Prepare underlying block devices Can use partitions of type 0x8e or software RAID devices 2. Create physical volumes # pvcreate \/dev\/hda3 3. Create volume group containing physical volume # vgcreate vg0 \/dev\/hda3 4. Create logical volumes inside volume groups # lvcreate -L 256M -n data vg0 5. Format and mount logical […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-238","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/kb.toderu.ro\/index.php?rest_route=\/wp\/v2\/posts\/238","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kb.toderu.ro\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kb.toderu.ro\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kb.toderu.ro\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kb.toderu.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=238"}],"version-history":[{"count":0,"href":"https:\/\/kb.toderu.ro\/index.php?rest_route=\/wp\/v2\/posts\/238\/revisions"}],"wp:attachment":[{"href":"https:\/\/kb.toderu.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=238"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kb.toderu.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=238"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kb.toderu.ro\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}