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Ubuntu 16.04 with LVM have delay around LVM mount.
$ dmesg
<snip>
[ 1.126338] FDC 0 is a S82078B
[ 1.830136] tsc: Refined TSC clocksource calibration: 3392.321 MHz
[ 1.830140] clocksource: tsc: mask: 0xffffffffffffffff max_cycles:
0x30e5f904771, max_idle_ns: 440795373543 ns
[ 6.984151] EXT4-fs (dm-0): mounted filesystem with ordered data
mode. Opts: (null)
[ 10.421370] systemd[1]: systemd 229 running in system mode.
(+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP
+LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID
+ELFUTILS +KMOD -IDN)
[ 10.421397] systemd[1]: Detected virtualization kvm.
<snip>
LVM partition will be activated by scripts/local-top/lvm2 in initrd.
But scripts/local-top/lvm2 does not take care of resume variable which
is set from UUID base RESUME.
$ cat /usr/share/initramfs-tools/scripts/local-top/lvm2
<snip>
activate() {
<snip>
/dev/mapper/*)
<snip>
}
activate "$ROOT"
activate "$resume"
<snip>
And then, scripts/local-premount/resume in initrd will always wait 5
seconds for activating LVM swap.
After mounting root filesystem, systemd will activate LVM swap.
$ cat /usr/share/initramfs-tools/scripts/local-premount/resume
<snip>
SWAPTYPE=$(wait-for-root "${resume}" ${RESUMEDELAY:-5})
<snip>
RESUME is defined at /etc/initramfs-tools/conf.d/resume which is
created by plugininstall.py.
So plugininstall.py needs to support non-UUID base RESUME,
e.g. RESUME=/dev/mapper/ubuntu--vg-swap_1.
$ sudo su -c 'echo RESUME=/dev/mapper/ubuntu--vg-swap_1 \
> /etc/initramfs-tools/conf.d/resume'
$ sudo update-initramfs -u && sudo reboot
$ dmesg # after boot
<snip>
[ 1.095876] FDC 0 is a S82078B
[ 1.507060] EXT4-fs (dm-0): mounted filesystem with ordered data
mode. Opts: (null)
[ 1.807522] tsc: Refined TSC clocksource calibration: 3392.321 MHz
[ 1.807526] clocksource: tsc: mask: 0xffffffffffffffff max_cycles:
0x30e5f904771, max_idle_ns: 440795373543 ns
[ 2.648513] systemd[1]: systemd 229 running in system mode.
(+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP
+LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID
+ELFUTILS +KMOD -IDN)
[ 2.648542] systemd[1]: Detected virtualization kvm.
** Affects: initramfs-tools (Ubuntu)
Importance: Undecided
Status: New
--
UUID base RESUME always wait 5 seconds for activating LVM swap
https://bugs.launchpad.net/bugs/1581801
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seeded packages, which is subscribed to initramfs-tools in Ubuntu.
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