Red Hat Bugzilla – Bug 127367
lvscan -v fails to report mapping of logical to physical extents
Last modified: 2010-04-27 09:37:25 EDT
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040510 Description of problem: Entire output of lvdisplay -v is # /usr/sbin/lvdisplay -v /dev/vgob01/lv_var Using logical volume(s) on command line --- Logical volume --- LV Name /dev/vgob01/lv_var VG Name vgob01 LV UUID iQiNiG-1HO8-aRqg-I0e0-R531-Urpn-jARgIi LV Write Access read/write LV Status available # open 1 LV Size 1.46 GB Current LE 375 Segments 1 Allocation next free (default) Read ahead sectors 0 Block device 253:6 According to the man page, this command should report mapping of logical to physical extents (and did so in LVM 1). Adding extra "-v" options does not help. lvdisplay --help reveals some options not documented in the man page (nor in the man page for lvm), including --maps, which gives some of the desired information. Version-Release number of selected component (if applicable): lvm2-2.00.15-2 kernel-2.6.6-1.435.2.3 How reproducible: Always Steps to Reproduce: 1. pick a logical volume. 2. run lvdisplay -v against it. 3. Actual Results: No mapping information (-v adds only one line to the output) Expected Results: Mapping of logical to physical extents should be displayed. Additional info:
--maps is the way to do this now; or lvs --segments; will be improved (e.g. to include reverse mapping from pv->lv) in future
Man page example needs fixing. Suggest also lvs -o +devices
Fedora Core 2 is now maintained by the Fedora Legacy project for security updates only. If this problem is a security issue, please reopen and reassign to the Fedora Legacy product. If it is not a security issue and hasn't been resolved in the current FC3 updates or in the FC4 test release, reopen and change the version to match.
PV to LV mappings are available using something like: pvs --segments -o+lv_name,seg_start_pe,segtype Mentioning this on man page and closing - lvdisplay is unlikely to receive further enhancement.