Dne 09. 07. 19 v 11:47 Simon ELBAZ napsal(a):
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 ?
Hi
Open field is counted in DM driver.
Whenever device is opened - +1 - closed -1.
You should be able to check 'lsof' to check and see if there are any userspace
openners. But you will not see 'kernel' opens this ways.
So i.e. if you mount DM device - it should be 1 open.
Occasionally you can hit some bug in target drivers - then counters can go
crazy and become confusing - then your solution is to collect as much
info as possible - and reboot....
Regards
Zdenek
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