Originally I've thought, that delayed uevents regarding raid partitions were
not related to md. To recap: if we assemble some md array as partitionable
array, add/change uevents regarding its partitions will not happen right
after assembly, only after next array related operation (mdadm -D, fdisk,
etc.). Similar thing happen when array is being stopped - remove uevents for
partitions will happen later. I made a post some time ago about it.
But now I have noticed, that analogus thing happens in the latest LVM
(2.02.29) - as it got the ability to use sysfs data to choose which devices
to consider during vgscan.
Now - if we're fresh after assembling some array as partitionable raid, and
on one of the partitions there is lvm group - vgscan -ay will not find any
lvm group on that partition.
It will find it during second attempt though, or if there was some array
related operation, i.e. -
fdisk /dev/md/d0
mdadm -D /dev/md/d0
- were ran after the assembly. Or if using sysfs is explicitely prohibited
in lvm.conf (sysfs_scan = 0), so it will consider all the nodes under /dev
as per lvm.conf, without using /sys/block as a hint.
If to peek into /sys/block/md* right after the assembly of the array,
there're no partition related directories. For example, if mdadm -As
assembles /dev/md/d0 with (already present) 4 partitions, /sys/block/md_d0
will have no md_d0p{1,2,3,4} dirs after the command. They will show up after
next array related command.
Analogously, if we stop the array with mdadm -S /dev/md/d0 , partitions will
remain until i.e. repeated mdadm -S /dev/md/d0
I'm not sure if this is the proper place to report this kinda of things
(maybe to kernel list ?), but I believe it to be sort of a bug. Any i.e.
hotplugged hard drive with partitions won't have those issues, be it udev,
lvm, etc.
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