I have a system currently using LVM2 that was originally set up on RHEL5 (where thin provisioning was not supported). This system would greatly benefit from the newer thin provisioning features, and so I am investigating upgrading to RHEL6 so that I may take advantage. My question is this: Can I convert existing LVM2 "thick" logical volumes into thinly-provisioned volumes on the fly? This page: https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Logical_Volume_Manager_Administration/thinly_provisioned_volume_creation.html lead me to believe that it is possible: "You can use the --thinpool parameter of the lvconvert command to convert an existing logical volume to a thin volume." with the following: lvconvert --thinpool vg001/lv1 --poolmetadata vg001/lv2 However, I seem to not understand how that works. From the example, I would assume that vg001/lv1 is the existing "thick" LV that I want to convert and that vg001/lv2 is an existing LV with enough space to become the metadata. So, I create a metadata LV with: test@testbox:~$ sudo lvcreate -L16G MyVG -n Metadata Logical volume "Metadata" created But when I attempt the conversion, I do not get what I would expect: test@testbox:~$ sudo lvconvert --thinpool MyVG/OldThickLV1 --poolmetadata MyVG/Metadata Converted MyVG/OldThickLV1 to thin pool. Then the OldThickLV1 disappears, leaving Metadata around: test@testbox:~$ sudo lvdisplay --- Logical volume --- LV Name Metadata VG Name MyVG LV UUID IZb6zP-D7iD-NswX-XcDZ-K5fN-sGBj-lCMiqO LV Write Access read/write LV Creation host, time testbox, 2014-02-14 13:50:04 -0500 LV Pool transaction ID 0 LV Pool metadata Metadata_tmeta LV Pool data Metadata_tdata LV Pool chunk size 64.00 KiB LV Zero new blocks no LV Status available # open 0 LV Size 16.00 GiB Allocated pool data 0.00% Allocated metadata 0.01% Current LE 4096 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:5 Am I doing something wrong here? Or am I going to have to create a new thin pool, new thin logical volumes, and copy the data over? Thanks, -- Jeremy _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
