On 11/19/2014 04:25 PM, Duncan wrote:
Most often, however, it's at resume, not original startup, which is
understandable as state at resume doesn't match state at suspend/
hibernate. The irritating thing, as previously discussed, is when one
device takes long enough to come back that mdraid or btrfs drops it out,
generally forcing the reboot I was trying to avoid with the suspend/
hibernate in the first place, along with a re-add and resync (for mdraid)
or a scrub (for btrfs raid).
If you want a practical solution you might want to look at
http://underdog.soruceforge.net (my project, shameless plug). The actual
user context return isn't in there but I use the project to build
initramfs images into all my kernels.
[DISCLAIMER: The cryptsetup and LUKS stuff is rock solid but the mdadm
incremental build stuff is very rough and so lightly untested]
You could easily add a drive preheat code block (spin up and status
check all drives with pause and repeat function) as a preamble function
that could/would safely take place before any glance is made towards the
resume stage.
extemporaneous example::
--- snip ---
cat <<'EOT' >>/opt/underdog/utility/preheat.mod
#!/bin/bash
# ROOT_COMMANDS+=( commands your preheat needs )
UNDERDOG+=( init.d/preheat )
EOT
cat <<'EOT' >>/opt/underdog/prototype/init.d/preheat
#!/bin/bash
function __preamble_preheat() {
whatever logic you need
return 0
}
__preamble_funcs+=( [preheat]=__preamble_preheat )
EOT
--- snip ---
install underdog, paste the above into a shell once. edit
/opt/underdog/prototype/init.d/preamble to put whatever logic in you need.
Follow the instructions in /opt/underdog/README.txt for making the
initramfs image or, as I do, build the initramfs into the kernel image.
The preamble will be run in the resultant /init script before the swap
partitions are submitted for attempted resume.
(The system does support complexity like resuming from a swap partition
inside an LVM/LV built over a LUKS encrypted media expanse, or just a
plain laptop with one plain partitioned disk, with zero changes to the
necessary default config.)
-- Rob.
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