On my typical system I have at least 3 partitions: - sda1 (EF00) - sda2 (8300; ext4 for /boot) - sda3 (8E00; LVM PV) In my LVM PV I have logical volumes for "/", "/usr/portage", "/var/log" and SWAP. Well, in my case sda3 is often full encrypted using LUKS before I add LVM on top but this shouldn't have an effect on the problem I am reporting. Sometimes I have multiple disks (i.e. sdb, sdc) which will have one large LVM partition. But these partition/volumes are getting mounted by the system using localmount service, not by genkernel. The problem: Sometimes (I don't know what's triggering this), after running the system for a while, LVM will become unable to see my logical volumes. They are still mounted and accessible but I will notice when I want to create LVM snapshots to backup the system when LVM reports it can't create the snapshot because the LVs/PVs are missing (`pvs` and `lvs` don't list them anymore). Howver that's only the case for sda, the LVM PV/LV genkernel mounts/activate. The PVs/LVs from my additional disks the local system mounts/activate are still present and show up. I tried to - restart udev (`/etc/init.d/udev restart`) - Re-run the `udevadm trigger` (with "--verbose" I see the dm-* in the list) - restart lvmetad (`/etc/init.d/lvmetad restart`) - restart lvm (`/etc/init.d/lvm restart`) but nothing helps. SO I went into "/dev/mapper" and noticed that the PVs/LVs the local system mounts/activates are shown up as symlinks but the PVs/LVs genkernel's initramfs mounts/activate aren't symlinks: > # ls -lv /dev/mapper/ > total 0 > crw------- 1 root root 10, 236 Oct 8 12:55 control > brw------- 1 root root 250, 6 Oct 8 12:55 dataVault > brw------- 1 root root 250, 0 Oct 8 12:55 root > lrwxrwxrwx 1 root root 7 Oct 8 12:55 dataStorage-volBackup -> ../dm-8 > lrwxrwxrwx 1 root root 7 Oct 8 13:05 dataStorage-volSrv -> ../dm-7 > brw------- 1 root root 250, 3 Oct 8 12:55 systemStorage-volLog > brw------- 1 root root 250, 2 Oct 8 12:55 systemStorage-volPortage > brw------- 1 root root 250, 5 Oct 8 12:55 systemStorage-volRoot > brw------- 1 root root 250, 1 Oct 8 12:55 systemStorage-volSwap I run `rm /dev/mapper/systemStorage-volPortage && /etc/init.d/udev restart` and voilà, udev re-created the device node as symlink. And _now_ the systemStorage PV shows up again with _all_ its logical volumes (although the other still not symlinked). Again, I don't now why/when this will happen. After a fresh boot I don't have symlinks for the systemStoarge group however the group and its volumes appear in `pvs` and `lvs` and I can create snapshots. So it doesn't seem to be a general problem. Only after a while... However that sounds like https://bugzilla.redhat.com/show_bug.cgi?id=869254 My system's LVM is build against UDEV (i.e. I am using sys-fs/lvm2[udev]) and I have set 'obtain_device_list_from_udev = 1' and 'external_device_info_source = "udev"' in /etc/lvm/lvm.conf. So I guess the root cause is, that LVM from genkernel doesn't support UDEV and therefore don't create symlinked device nodes. Tested with =sys-apps/genkernel-3.4.52.4-r2 which is using LVM at v2.02.88. My system's LVM is at v2.02.145-r2. # emerge --info Portage 2.3.1 (python 3.4.5-final-0, default/linux/amd64/13.0, gcc-5.4.0, glibc-2.23-r2, 4.4.23-gentoo x86_64) ================================================================= System uname: Linux-4.4.23-gentoo-x86_64-Intel-R-_Xeon-R-_CPU_E3-1275_V2_@_3.50GHz-with-gentoo-2.3 KiB Mem: 32844824 total, 23276240 free KiB Swap: 4194300 total, 4194300 free Timestamp of repository gentoo: Fri, 07 Oct 2016 21:30:36 +0000 sh bash 4.4 ld GNU ld (Gentoo 2.26.1 p1.0) 2.26.1 app-shells/bash: 4.4::gentoo dev-lang/perl: 5.24.0-r1::gentoo dev-lang/python: 2.7.12::gentoo, 3.4.5::gentoo dev-util/cmake: 3.6.2::gentoo dev-util/pkgconfig: 0.29.1::gentoo sys-apps/baselayout: 2.3::gentoo sys-apps/openrc: 0.22.2::gentoo sys-apps/sandbox: 2.10-r2::gentoo sys-devel/autoconf: 2.69-r2::gentoo sys-devel/automake: 1.13.4-r1::gentoo, 1.14.1-r1::gentoo, 1.15-r2::gentoo sys-devel/binutils: 2.25.1-r1::gentoo, 2.26.1::gentoo sys-devel/gcc: 5.4.0::gentoo sys-devel/gcc-config: 1.8-r1::gentoo sys-devel/libtool: 2.4.6-r2::gentoo sys-devel/make: 4.2.1::gentoo sys-kernel/linux-headers: 4.4::gentoo (virtual/os-headers) sys-libs/glibc: 2.23-r2::gentoo
OK, I got my static lvm2 with UDEV support into the initramfs (see bug 442078). However when set 'external_device_info_source = "udev"' in /etc/lvm/lvm.conf (which get copied into the initramfs) the lvm part will fail with many > Udev database has incomplete information about device <device> errors. That's because lvm with UDEV supports expect /run/udev/ to be populated which isn't in the initramfs. I think > In other words, if udev is not running before you activate lvm, you may have problems. (from https://bugs.gentoo.org/show_bug.cgi?id=559026#c10) describes the problem best :/ Sounds like I have to use LVM2 without UDEV support, i.e. with > obtain_device_list_from_udev=0 > external_device_info_source="none" But I still don't understand why it suddenly stop working. I.e. why LVM works after boot for a while (i.e. all volumes show up, I can create snapshots...) and suddenly LVM no longer sees its volumes.
Bug has been closed via the following commit: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=ed4c4b10e62a57129bb7da924f850e65bdf47b71 commit ed4c4b10e62a57129bb7da924f850e65bdf47b71 Author: Robin H. Johnson <robbat2@gentoo.org> AuthorDate: 2017-09-03 06:34:32 +0000 Commit: Robin H. Johnson <robbat2@gentoo.org> CommitDate: 2017-09-03 06:44:08 +0000 sys-kernel/genkernel: bump, lots of improvements - Improvements to the bincache system. - Updates initramfs tools to ensure they compile on ~arch glibc. -- busybox 1.27.2 -- mdadm 4.0 -- lvm 2.02.173 -- gpg 1.4.22 The following not well tested with new glibc at this time: - dmraid - fuse - iscsi - unionfs-fuse Closes: https://bugs.gentoo.org/442078 Closes: https://bugs.gentoo.org/524346 Closes: https://bugs.gentoo.org/596540 Closes: https://bugs.gentoo.org/627398 Closes: https://bugs.gentoo.org/628020 Closes: https://bugs.gentoo.org/609342 Package-Manager: Portage-2.3.6, Repoman-2.3.3 sys-kernel/genkernel/Manifest | 5 + sys-kernel/genkernel/genkernel-3.5.2.0.ebuild | 165 ++++++++++++++++++++++++++ sys-kernel/genkernel/genkernel-9999.ebuild | 17 +-- 3 files changed, 179 insertions(+), 8 deletions(-)
