1,885
edits
Changes
Created page with 'When the students are done lab 3, they should have: * fedora1 This VM has a GUI and no free space in the VG. VG #PV #LV #SN Attr VSize VFree vg_fedora1 1 ...'
When the students are done lab 3, they should have:
* fedora1
This VM has a GUI and no free space in the VG.
VG #PV #LV #SN Attr VSize VFree
vg_fedora1 1 2 0 wz--n- 9.80G 0
LV VG Attr LSize
lv_root vg_fedora1 -wi-ao 8.83G
lv_swap vg_fedora1 -wi-ao 992.00M
PV VG Fmt Attr PSize PFree
/dev/vda2 vg_fedora1 lvm2 a- 9.80G 0
* fedora2
This VM has a GUI and free space in the VG.
VG #PV #LV #SN Attr VSize VFree
vg_fedora2 1 3 0 wz--n- 9.80G 3.95G
LV VG Attr LSize
lv_home vg_fedora2 -wi-ao 1000.00M
lv_root vg_fedora2 -wi-ao 3.91G
lv_swap vg_fedora2 -wi-ao 992.00M
PV VG Fmt Attr PSize PFree
/dev/vda2 vg_fedora2 lvm2 a- 9.80G 3.95G
* fedora3
This VM has no GUI installed.
VG #PV #LV #SN Attr VSize VFree
vg_fedora3 1 3 0 wz--n- 9.80G 3.83G
LV VG Attr LSize
lv_home vg_fedora3 -wi-ao 1.00G
lv_root vg_fedora3 -wi-ao 4.00G
lv_swap vg_fedora3 -wi-ao 992.00M
PV VG Fmt Attr PSize PFree
/dev/vda2 vg_fedora3 lvm2 a- 9.80G 3.83G
* host (disk pack)
Four PVs, minimum VG size 60G
Single filesystem on vg_main/root, size 50G
At least 10G available space in VG
20% of disk space unallocated (min 15G)
Recommendations for the revised LVM lab:
* Start with the GUI tool, which may help them visualize what is happening.
* Continue with performing exactly the same operations on another VM using command-line tools.
* Next, the will add a second virtual disk to a VM and migrate /home to its own filesystem.
* On the real system (disk pack), they will add a partition as a PV and grow the root filesystem (minimal risk).
* They will then migrate a VM from its original virtual disk to a new, slightly larger virtual disk.
Investigation 1: How are LVMs managed using system-config-lvm?
* On fedora2, perform some LVM operations using the system-config-lvm graphical tool:
** Grow the home filesystem to 2G
** Create a new 2G LV containing an ext4 filesystem named lv_archive and mount it at /archive
** Backup /etc into /archive
** Shrink lv_archive to 1G
** Try shrinking / and observe that it is not permitted
Investigation 2: How are LVMs managed from the command line?
* Repeat the operations from Investigation 1, using fedora3:
** Grow the home filesystem to 2G
** Create a new 2G LV containing an ext4 filesystem and mount it at /archive (lvcreate, mkfs, mount, edit fstab, reboot to confirm automatic mount)
** Backup /etc into /archive
** Shrink lv_archive to 1G (umount, resize2fs, lvreduce, resize2fs, mount)
** Try shrinking / and observe that it is not permitted
Investigation 3: How can a PV be added to an existing VG?
* Provision fedora1 with an additional 5G virtual disk
* Add that virtual disk to the existing volume group
* Create lv_home (1G), and migrate /home onto it (lvcreate, mkfs, mount, mv, rm, umount, edit fstab, mount)
Investigation 4: How can I use LVM to manage storage on my disk pack?
* On the host (disk pack):
** Create a new logical partition (minimum 5G, leaving at least 10G free space in the extended partition)
** Add that partition as a PV into the existing VG
** Grow the root filesystem to fill the available space (this will provide sufficient space for Investigation 5)
Investigation 5: How can I migrate data off a failing disk or to a larger disk?
* Migrate fedora3 from one virtual disk to another:
** Add a 12G virtual disk to fedora3
** Partition that second disk in a manner similar to the first disk.
** Copy the /dev/vda1 contents to /dev/vdb1.
** Add the remaining space on /dev/vdb to the existing VG.
** Migrate the data off the first disk onto the second.
** Remove the first disk from the volume group.
** Install grub on the second disk.
** Shut down the VM.
** Remove the first virtual disk from the VM.
** Start up the VM from the new virtual disk.
* fedora1
This VM has a GUI and no free space in the VG.
VG #PV #LV #SN Attr VSize VFree
vg_fedora1 1 2 0 wz--n- 9.80G 0
LV VG Attr LSize
lv_root vg_fedora1 -wi-ao 8.83G
lv_swap vg_fedora1 -wi-ao 992.00M
PV VG Fmt Attr PSize PFree
/dev/vda2 vg_fedora1 lvm2 a- 9.80G 0
* fedora2
This VM has a GUI and free space in the VG.
VG #PV #LV #SN Attr VSize VFree
vg_fedora2 1 3 0 wz--n- 9.80G 3.95G
LV VG Attr LSize
lv_home vg_fedora2 -wi-ao 1000.00M
lv_root vg_fedora2 -wi-ao 3.91G
lv_swap vg_fedora2 -wi-ao 992.00M
PV VG Fmt Attr PSize PFree
/dev/vda2 vg_fedora2 lvm2 a- 9.80G 3.95G
* fedora3
This VM has no GUI installed.
VG #PV #LV #SN Attr VSize VFree
vg_fedora3 1 3 0 wz--n- 9.80G 3.83G
LV VG Attr LSize
lv_home vg_fedora3 -wi-ao 1.00G
lv_root vg_fedora3 -wi-ao 4.00G
lv_swap vg_fedora3 -wi-ao 992.00M
PV VG Fmt Attr PSize PFree
/dev/vda2 vg_fedora3 lvm2 a- 9.80G 3.83G
* host (disk pack)
Four PVs, minimum VG size 60G
Single filesystem on vg_main/root, size 50G
At least 10G available space in VG
20% of disk space unallocated (min 15G)
Recommendations for the revised LVM lab:
* Start with the GUI tool, which may help them visualize what is happening.
* Continue with performing exactly the same operations on another VM using command-line tools.
* Next, the will add a second virtual disk to a VM and migrate /home to its own filesystem.
* On the real system (disk pack), they will add a partition as a PV and grow the root filesystem (minimal risk).
* They will then migrate a VM from its original virtual disk to a new, slightly larger virtual disk.
Investigation 1: How are LVMs managed using system-config-lvm?
* On fedora2, perform some LVM operations using the system-config-lvm graphical tool:
** Grow the home filesystem to 2G
** Create a new 2G LV containing an ext4 filesystem named lv_archive and mount it at /archive
** Backup /etc into /archive
** Shrink lv_archive to 1G
** Try shrinking / and observe that it is not permitted
Investigation 2: How are LVMs managed from the command line?
* Repeat the operations from Investigation 1, using fedora3:
** Grow the home filesystem to 2G
** Create a new 2G LV containing an ext4 filesystem and mount it at /archive (lvcreate, mkfs, mount, edit fstab, reboot to confirm automatic mount)
** Backup /etc into /archive
** Shrink lv_archive to 1G (umount, resize2fs, lvreduce, resize2fs, mount)
** Try shrinking / and observe that it is not permitted
Investigation 3: How can a PV be added to an existing VG?
* Provision fedora1 with an additional 5G virtual disk
* Add that virtual disk to the existing volume group
* Create lv_home (1G), and migrate /home onto it (lvcreate, mkfs, mount, mv, rm, umount, edit fstab, mount)
Investigation 4: How can I use LVM to manage storage on my disk pack?
* On the host (disk pack):
** Create a new logical partition (minimum 5G, leaving at least 10G free space in the extended partition)
** Add that partition as a PV into the existing VG
** Grow the root filesystem to fill the available space (this will provide sufficient space for Investigation 5)
Investigation 5: How can I migrate data off a failing disk or to a larger disk?
* Migrate fedora3 from one virtual disk to another:
** Add a 12G virtual disk to fedora3
** Partition that second disk in a manner similar to the first disk.
** Copy the /dev/vda1 contents to /dev/vdb1.
** Add the remaining space on /dev/vdb to the existing VG.
** Migrate the data off the first disk onto the second.
** Remove the first disk from the volume group.
** Install grub on the second disk.
** Shut down the VM.
** Remove the first virtual disk from the VM.
** Start up the VM from the new virtual disk.