please reopen if this is still an issue
** Changed in: systemd (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1635729
Title:
bcache won't start on boot due to exotic block devices filtered in
udev rules
Status in systemd package in Ubuntu:
Won't Fix
Bug description:
If a bcache is created with a Curtis-Wright NVRAM card as caching
device, the bcache device will not show up on boot without manual
intervention.
Tracking this down show this being due to the fact, that line 9 of
/lib/udev/rules.d/60-persistent-storage.rules filters on a whitelist
of devices
(loop*|mmcblk*[0-9]|msblk*[0-9]|mspblk*[0-9]|nvme*|sd*|sr*|vd*|xvd*|bcache*|cciss*|dasd*|ubd*),
that doesn't include the NVRAM devices (umem*). A few steps later,
this results in bcache_register() not being called.
Trivially patching
-KERNEL!="loop*|mmcblk*[0-9]|msblk*[0-9]|mspblk*[0-9]|nvme*|sd*|sr*|vd*|xvd*|bcache*|cciss*|dasd*|ubd*",
GOTO="persistent_storage_end"
+KERNEL!="loop*|mmcblk*[0-9]|msblk*[0-9]|mspblk*[0-9]|nvme*|sd*|sr*|vd*|xvd*|bcache*|cciss*|dasd*|ubd*|umem*",
GOTO="persistent_storage_end"
resolves the issue.
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