lvs,pvs,vgs each provide for output of specified columns (with optional
headers and field separators); HOWEVER this is still limited as (at
least on my debian pkg) PV and LV commands cannot be combined, thus
negating the possibility of anything even as simple as:
# vgs -o vg_name,lv_name,pv_name
Can't report LV and PV fields at the same time
Also, the man pages (at least those provided with the debian pkg)
aren't particularly detailed. They list some (but not all) of the
possible column headers and even exclude one of the default column
headers (I have no idea what optional column generates the "Log"
header).
While this can be segmented into separate commands, the whole idea was
concise presentation. I'm basically using perl to parse the output of
vgs,lvs,pvs with full columns and output the pertitent (at least to me
anyway) information.
I still haven't figured out how to figure out the disk usage of a
particular PV in a given LV. To illustrate:
# vgdisplay -v | grep -B3 Free
Finding all volume groups
Finding volume group "home"
PE Size 4.00 MB
Total PE 52205
Alloc PE / Size 52205 / 203.93 GB
Free PE / Size 0 / 0
--
PV Name /dev/sdb
PV UUID zTUa5N-NtiP-6aMh-6WJi-d3Xk-MSwN-enKL2P
PV Status allocatable
Total PE / Free PE 38156 / 0
--
PV Name /dev/hdb4
PV UUID 9QYlyj-1dS2-NkVQ-fmZ5-v5bp-N9J6-qirHn6
PV Status allocatable
Total PE / Free PE 14049 / 0
This returns the number of allocated PEs of a given PV to a particular
VG, but does not offer any indication of actual disk usage of those PE
on the PV in the LV. Similarly:
# vgs -o vg_name,devices
VG Devices
home /dev/sdb(0)
home /dev/hdb4(0)
Reveals which PVs are allocated to which VG -- but none of the options
appear to offer anything akin to `df` specific to a particular PV in
the LV. I'm looking for something like:
~# df -h /home
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/home-lvol0
201G 72G 122G 38% /home
But with a per PV breakdown -- someting like (numbers made up):
VG home Size Used Avail Use% Mounted on
LV /dev/home/lvol0 201G 72G 122G 38% /home
PV /dev/sdb(0) 160G 50G 110G 31%
PV /dev/hdb4(0) 41G 22G 19G 54%
--- Jonathan E Brassow <jbrassow@redhat.com> wrote:
> You can pretty much print things how you want by specifying the right
> things on the command line. 'lvs' and friends will default to
> printing out certain columns, but you can change that.
>
> prompt> lvs --noheadings # print things out without the headings
> prompt> lvs --noheadings -o lv_name #print just the lv names
> prompt> lvs --noheadings -o lv_name, uuid #print the lv names and
> their uuid
> etc
>
> for a more complete list, see the various man pages
>
> brassow
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