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Systemd integration for starting newly-degraded arrays. 

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>
This commit is contained in:
NeilBrown 2013-12-02 16:08:04 +11:00
parent 9ca39acb3e
commit 169ffac7ad
4 changed files with 17 additions and 1 deletions
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2
Makefile
View File

@ -285,6 +285,8 @@ install-udev: udev-md-raid-arrays.rules udev-md-raid-assembly.rules
install-systemd: systemd/mdmon@.service
$(INSTALL) -D -m 644 systemd/mdmon@.service $(DESTDIR)$(SYSTEMD_DIR)/mdmon@.service
$(INSTALL) -D -m 644 systemd/mdadm-last-resort@.timer $(DESTDIR)$(SYSTEMD_DIR)/mdadm-last-resort@.timer
$(INSTALL) -D -m 644 systemd/mdadm-last-resort@.service $(DESTDIR)$(SYSTEMD_DIR)/mdadm-last-resort@.service
uninstall:
rm -f $(DESTDIR)$(MAN8DIR)/mdadm.8 $(DESTDIR)$(MAN8DIR)/mdmon.8 $(DESTDIR)$(MAN4DIR)/md.4 $(DESTDIR)$(MAN5DIR)/mdadm.conf.5 $(DESTDIR)$(BINDIR)/mdadm

7
systemd/mdadm-last-resort@.service Normal file
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@ -0,0 +1,7 @@
[Unit]
Description=Activate md array even though degraded
DefaultDependencies=no
[Service]
Type=oneshot
ExecStart=/sbin/mdadm --run /dev/%i

6
systemd/mdadm-last-resort@.timer Normal file
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@ -0,0 +1,6 @@
[Unit]
Description=Timer to wait for more drives before activating degraded array.
DefaultDependencies=no
[Timer]
OnActiveSec=30

3
udev-md-raid-assembly.rules
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@ -12,7 +12,8 @@ LABEL="md_inc"
# remember you can limit what gets auto/incrementally assembled by
# mdadm.conf(5)'s 'AUTO' and selectively whitelist using 'ARRAY'
ACTION=="add", RUN+="/sbin/mdadm --incremental $devnode --offroot"
ACTION=="add", IMPORT{program}="/sbin/mdadm --incremental --export $devnode --offroot"
ACTION=="add", ENV{MD_STARTED}=="*unsafe*", ENV{MD_FOREIGN}=="no", ENV{SYSTEMD_WANTS}+="mdadm-last-resort@$env{MD_DEVICE}.timer"
ACTION=="remove", ENV{ID_PATH}=="?*", RUN+="/sbin/mdadm -If $name --path $env{ID_PATH}"
ACTION=="remove", ENV{ID_PATH}!="?*", RUN+="/sbin/mdadm -If $name"