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When using lvmetad, 'pvs' still evaluates full filters
on all devices (lvmetad only provides info about PVs,
but pvs needs to report info about all devices, at
least sometimes.)
Because some filters read the devices, pvs still reads
every device, even with lvmetad (i.e. lvmetad is no help
for the pvs command.) Because the device reads are not
being managed by the standard label scan layer, but only
happen incidentally through the filters, there is nothing
to control and limit the bcache content and the open file
descriptors for the devices. When there are a lot of devs
on the system, the number of open fd's excedes the limit
and all opens begin failing.
The proper solution for this would be for pvs to really
use lvmetad and not scan devs, or for pvs to do a proper
label scan even when lvmetad is enabled. To avoid any
major changes to the way this has worked, just work around
this problem by dropping bcache and closing the fd after
pvs evaluates the filter on each device.
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