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Title
Replace Disks or Storage Backend -
Description
Disks or Backend storage where QoreStor reside needs to be replaced or removed. -
Resolution
Quest recommends using Logical Volume Management (LVM) when configuring the storage locations for your QoreStor data repository and metadata directories. The use of LVM provides for more flexibility than traditional disk partitioning and allows for much easier storage expansion in the future.
These example procedures show how you can remove a disk from an existing logical volume, either to replace the disk or to use the disk as part of a different volume. In order to remove a disk, you must first move the extents on the LVM physical volume to a different disk or set of disks.
Moving Extents to Existing Physical Volumes
In this example, the logical volume is distributed across four physical volumes in the volume groupmyvg.# pvs -o+pv_used PV VG Fmt Attr PSize PFree Used /dev/sda1 myvg lvm2 a- 17.15G 12.15G 5.00G /dev/sdb1 myvg lvm2 a- 17.15G 12.15G 5.00G /dev/sdc1 myvg lvm2 a- 17.15G 12.15G 5.00G /dev/sdd1 myvg lvm2 a- 17.15G 2.15G 15.00GThis examples moves the extents off of/dev/sdb1so that it can be removed from the volume group.- If there are enough free extents on the other physical volumes in the volume group, you can execute the
pvmovecommand on the device you want to remove with no other options and the extents will be distributed to the other devices.# pvmove /dev/sdb1 /dev/sdb1: Moved: 2.0% ... /dev/sdb1: Moved: 79.2% ... /dev/sdb1: Moved: 100.0%After thepvmovecommand has finished executing, the distribution of extents is as follows:# pvs -o+pv_used PV VG Fmt Attr PSize PFree Used /dev/sda1 myvg lvm2 a- 17.15G 7.15G 10.00G /dev/sdb1 myvg lvm2 a- 17.15G 17.15G 0 /dev/sdc1 myvg lvm2 a- 17.15G 12.15G 5.00G /dev/sdd1 myvg lvm2 a- 17.15G 2.15G 15.00G - Use the
vgreducecommand to remove the physical volume/dev/sdb1from the volume group.# vgreduce myvg /dev/sdb1 Removed "/dev/sdb1" from volume group "myvg" # pvs PV VG Fmt Attr PSize PFree /dev/sda1 myvg lvm2 a- 17.15G 7.15G /dev/sdb1 lvm2 -- 17.15G 17.15G /dev/sdc1 myvg lvm2 a- 17.15G 12.15G /dev/sdd1 myvg lvm2 a- 17.15G 2.15G
The disk can now be physically removed or allocated to other users.Moving Extents to a New Disk
In this example, the logical volume is distributed across three physical volumes in the volume groupmyvgas follows:# pvs -o+pv_used PV VG Fmt Attr PSize PFree Used /dev/sda1 myvg lvm2 a- 17.15G 7.15G 10.00G /dev/sdb1 myvg lvm2 a- 17.15G 15.15G 2.00G /dev/sdc1 myvg lvm2 a- 17.15G 15.15G 2.00GThis example procedure moves the extents of/dev/sdb1to a new device,/dev/sdd1.- Create a new physical volume from
/dev/sdd1.# pvcreate /dev/sdd1 Physical volume "/dev/sdd1" successfully created - Add the new physical volume
/dev/sdd1to the existing volume groupmyvg.# vgextend myvg /dev/sdd1 Volume group "myvg" successfully extended # pvs -o+pv_used PV VG Fmt Attr PSize PFree Used /dev/sda1 myvg lvm2 a- 17.15G 7.15G 10.00G /dev/sdb1 myvg lvm2 a- 17.15G 15.15G 2.00G /dev/sdc1 myvg lvm2 a- 17.15G 15.15G 2.00G /dev/sdd1 myvg lvm2 a- 17.15G 17.15G 0
- Use the
pvmovecommand to move the data from/dev/sdb1to/dev/sdd1.# pvmove /dev/sdb1 /dev/sdd1 /dev/sdb1: Moved: 10.0% ... /dev/sdb1: Moved: 79.7% ... /dev/sdb1: Moved: 100.0% # pvs -o+pv_used PV VG Fmt Attr PSize PFree Used /dev/sda1 myvg lvm2 a- 17.15G 7.15G 10.00G /dev/sdb1 myvg lvm2 a- 17.15G 17.15G 0 /dev/sdc1 myvg lvm2 a- 17.15G 15.15G 2.00G /dev/sdd1 myvg lvm2 a- 17.15G 15.15G 2.00G
- After you have moved the data off
/dev/sdb1, you can remove it from the volume group.# vgreduce myvg /dev/sdb1 Removed "/dev/sdb1" from volume group "myvg"
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Additional Information
https://support.quest.com/technical-documents/qorestor/5.0.1/installation-guide/4#TOPIC-1069270 https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/logical_volume_manager_administration/disk_remove_ex