[DRBD-user] drbd resyncing entire device after each reboot

Robert Altnoeder robert.altnoeder at linbit.com
Mon Oct 8 11:07:55 CEST 2018

This is interesting:
> Oct  5 21:36:44 claire kernel: [  381.510789] block drbd0: attached to UUIDs 0000000000000004:0000000000000000:B6D88D552E97D8B6:B6D78D552E97D8B7
> Oct  5 21:36:45 claire kernel: [  382.310680] block drbd0: self 0000000000000004:0000000000000000:B6D88D552E97D8B6:B6D78D552E97D8B7 bits:0 flags:0
A current UUID of 4 indicates freshly created DRBD meta data (in other
words, someone ran 'drbdadm create-md' on it)

and this one I find surprising:
> Oct  5 21:36:47 claire kernel: [  384.275789] block drbd0: updated sync uuid 0001000000000004:0000000000000000:B6D88D552E97D8B6:B6D78D552E97D8B7
...because that's just 1 bit away from a value of 4 again, which seems
unlikely if this number was generated randomly.
On the other hand, this may be an intentionally chosen value that I
don't know about. Will have to check.


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