Package: lvm2 Version: 2.02.95-7 Severity: important Tags: patch Hi,
I started using bcache and I've experienced two problems in two different installations, both related to LVM: Case 1: When using LVM for the root FS and the physical volume is a bcache device the LVM fails to detect the PV. The reason is that bcache works with udev rules which may need some time to be triggered. More specifically, in this case I had an MD-raid-1 and an SSD device combined as a bcache device which is then used as PV. During the boot process LVM runs after mdadm but that time between them is not enough for the udev rules (inside initramfs) to present the bcache device and thus LVM does not detect it. Adding a timetout in the initramfs lvm script does the trick Case 2: That's more tricky: Using LVM on an SSD. Then using one of the LVs as the cache device for bcache which is then used as PV for LVM. IOW: LVM over BCACHE over LVM. Here the problem is that the init scripts need another round of VG activation in order to detect the second layer of LVM. The attached patch fixes both of this cases. I'm not sure if there's a more optimal way of achieving this. Thanks, Stefanos -- System Information: Debian Release: jessie/sid APT prefers testing APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 3.10.5-v2-v (SMP w/4 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Versions of packages lvm2 depends on: ii dmsetup 2:1.02.74-7 ii initscripts 2.88dsf-41 ii libc6 2.17-7 ii libdevmapper-event1.02.1 2:1.02.74-7 ii libdevmapper1.02.1 2:1.02.74-7 ii libreadline5 5.2+dfsg-2 ii libudev0 175-7.2 ii lsb-base 4.1+Debian12 lvm2 recommends no packages. lvm2 suggests no packages. -- Configuration Files: /etc/init.d/lvm2 changed [not included] /etc/lvm/lvm.conf changed [not included] -- debconf-show failed -- debsums errors found: debsums: changed file /usr/share/initramfs-tools/scripts/local-top/lvm2 (from lvm2 package)
diff --git a/debian/lvm2.init b/debian/lvm2.init index df599c5..0232bdd 100644 --- a/debian/lvm2.init +++ b/debian/lvm2.init @@ -27,7 +27,7 @@ do_start() case "$1" in start) log_action_begin_msg "Setting up LVM Volume Groups" - do_start + do_start && sleep 2 && do_start case "$?" in 0|1) log_action_end_msg 0 ;; 2) log_action_end_msg 1 ;; diff --git a/debian/tree/lvm2/usr/share/initramfs-tools/scripts/local-top/lvm2 b/debian/tree/lvm2/usr/share/initramfs-tools/scripts/local-top/lvm2 index 8fdd1f8..3b64f63 100755 --- a/debian/tree/lvm2/usr/share/initramfs-tools/scripts/local-top/lvm2 +++ b/debian/tree/lvm2/usr/share/initramfs-tools/scripts/local-top/lvm2 @@ -24,6 +24,9 @@ activate_vg() return 1 fi + # Wait for udev rules to present more devices + sleep 2 + # Take care of lilo boot arg, risky activating of all vg case "$dev" in fe[0-9]*)
