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Not sure if this is related to bz 1691277
Description of problem:
Previous build on RHEL7.5 with similar number of luns attached is able to boot successfully.
However with RHEL7.6 the server drops to maintenance mode.
This does not appear to be a problem with multiple signatures on the partitions as bz 1671036 also don't believe it is bz 1666612
Version-Release number of selected component (if applicable):
lvm2-2.02.180-10.el7_6.3.x86_64.rpm
How reproducible:
every boot
Steps to Reproduce:
1. attach 1000+ luns
2. boot
Actual results:
boot enters maintenance mode
Expected results:
server to boot
Additional info:
There was no lvm filter set and looks like hitting too many open files.
However this worked previously with lvm on RHEL7.5
Has something changed in handling of opening of devices between these versions.
Will attach lvmdump output and sosreport from a failed boot.
Assumption is - it's duplicate of bug 1666612.
If the fixing of udev rules fixes the issue - please close as duplicate.
Also see the bug 1671036 comment 32.
Yep this looks like the tool gets out of file descriptors.
From light look over 7.6 branch - it does look like there is limitation for 256 MAX_IO.
Can we see output of:
# cat /proc/sys/fs/file-nr
Also as an instant workaround - please setup proper 'white-listing' filter that accepts only those devices that can be really PV
and reject every other block device in system (global_filter)
This should greatly enhance overal performance for lvm & lvmetad.