lvdisplay "open" field computing

[Simon ELBAZ <selbaz@xxxxxxxxxxxx>]

Hi,

I am trying to understand how the open field is computed.

On a CentOS6 server, lvdisplay has the following output:

lvdisplay /dev/mapper/vg_obm-var_spool_imap
  --- Logical volume ---
  LV Path                /dev/vg_obm/var_spool_imap
  LV Name                var_spool_imap
  VG Name                vg_obm
  LV UUID                0oK7h0-tDZH-eUxE-AyBw-cK7x-U9pS-W7X4Uh
  LV Write Access        read/write
  LV Creation host, time panoramix.ch-perrens.fr, 2015-01-16 11:03:10 +0100
  LV Status              available
  # open                 2
  LV Size                1,92 TiB
  Current LE             504572
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:3

 And dmsetup show the following info:

# dmsetup info -c | grep "253" | grep " 3"
vg_obm-var_spool_imap                 253   3 L--w    2    2      0 LVM-1i1v6pEjab2WslaDQRvkf8eLk6QfBW4J0oK7h0tDZHeUxEAyBwcK7xU9pSW7X4Uh

Could you please give me some hint to understand how "open = 2" is obtained ?

Regards

-- 
Simon Elbaz
@Linagora
Mob: +33 (0) 6 38 99 18 34
Tour Franklin 31ème étage
100/101 Quartier Boieldieu
92042 La Défense
FRANCE

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