Mdadm does not wait enough time when mdmon is started by systemd.
It causes various problems with behaviour of a RAID volume with external metadata.
For example: mdmon does not update a value of checkpoint during migration
and second RAID5 volume is read-only after reboot done during
container reshape (both problems occur with IMSM matadata).
If a type of process start-up is changed to 'forking', systemctl will
wait until mdmon (parent) process exits after calling fork.
This way mdmon will always be fully initialized after start_mdmon
and these problems will not occur.
In this case it is recommended to add a path to PIDFile, so that systemd
does not have to guess a PID of the mdmon process.
Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Reviewed-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Reviewed-by: Lukasz Dorau <lukasz.dorau@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Redirecting output to /dev/null is unnecessary and hides any error
messages there might be. So leave as defaults which are none,
journal, inherit.
Signed-off-by: NeilBrown <neilb@suse.de>
As mdmon doesn't inherit environment from mdadm when it is started
by system, it cannot inherit IMSM_NO_PLATFORM.
But if an imsm array as assembled then mdmon really should handle it
whether there is a platform present or not.
So always set this var.
Signed-off-by: NeilBrown <neilb@suse.de>
When the md device actually appears we want to stop the timer and not
bother with the mdadm-last-resort@.server. In particular, running
that causes confusing messages and is in general best avoided.
Fortuantely this can simply be achieved with a Conflicts= line
Signed-off-by: NeilBrown <neilb@suse.de>
This systemd unit file runs mdadm in --monitor mode.
It is started by a SYSTEMD_WANTS signal from udev whenever
an md array is started that would benefit from mdadm --monitor.
Commandline arguments can be provided by a script
/usr/lib/systemd/scripts/mdadm_env.sh
which should write an
MDADM_MONITOR_ARGS=....
line to /run/sysconfig/mdadm
A script to extra args from SUSE's /etc/sysconfig/mdadm file
is provided.
If no mdadm_env.sh is provided, then args are "--scan" which
requires "mail" or "program" to be set in /etc/mdadm.conf.
I believe this is suitable for Fedora.
Signed-off-by: NeilBrown <neilb@suse.de>
Normally "mdadm -I" will not start an array if it has reason to
expect further devices.
This means that if a device is removed while the host is shut down,
"mdadm -I" will never start the device.
If the array is know to the host, it make sense to start the array
anyway after a reasonable timeout.
This patch adds systemd/udev infrastructure so that 30 seconds after
a known array first becomes able to be assembled as a degraded array,
the array will be assembled even if more devices are still expected.
Signed-off-by: NeilBrown <neilb@suse.de>
While not strictly necessary for systemd, it is cleaner to avoid
forking when running from a management daemon. So add a --foreground
option to mdmon.
Signed-off-by: NeilBrown <neilb@suse.de>
If launching mdmon via systemctl fails, we fall back to the old method
of fork/exec. This allows for having mdmon launched via systemctl
which avoids problems with it getting killed by systemd due to it
ending up in the parent's cgroup (udev).
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Pawel Baldysiak
NeilBrown
Jes Sorensen