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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.
This tree contains the LVM2 and device-mapper tools and libraries. For more information about LVM2 read the changelog in the WHATS_NEW file. Installation instructions are in INSTALL. There is no warranty - see COPYING and COPYING.LIB. Tarballs are available from: ftp://sourceware.org/pub/lvm2/ ftp://sources.redhat.com/pub/lvm2/ https://github.com/lvmteam/lvm2/releases The source code is stored in git: https://sourceware.org/git/?p=lvm2.git git clone git://sourceware.org/git/lvm2.git mirrored to: https://github.com/lvmteam/lvm2 git clone https://github.com/lvmteam/lvm2.git git clone git@github.com:lvmteam/lvm2.git Mailing list for general discussion related to LVM2: linux-lvm@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/linux-lvm Mailing lists for LVM2 development, patches and commits: lvm-devel@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/lvm-devel lvm2-commits@lists.fedorahosted.org (Read-only archive of commits) Subscribe from https://fedorahosted.org/mailman/listinfo/lvm2-commits Mailing list for device-mapper development, including kernel patches and multipath-tools: dm-devel@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/dm-devel Website: https://sourceware.org/lvm2/ Report upstream bugs at: https://bugzilla.redhat.com/enter_bug.cgi?product=LVM%20and%20device-mapper or open issues at: https://github.com/lvmteam/lvm2/issues The source code repository used until 7th June 2012 is accessible here: http://sources.redhat.com/cgi-bin/cvsweb.cgi/LVM2/?cvsroot=lvm2.