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The "vdo" man page says:
--vdoHashZoneThreads=thread count
Specifies the number of threads across which to subdivide parts
of the VDO processing based on the hash value computed from the
block data. The value must be at least 1 and less than or equal
to 100. vdoHashZonesThreads, vdoLogicalThreads and vdoPhysi-
calThreads must be either all zero or all non-zero. The default
is 2.
The minimum value is in fact 0, and the default is 1.
The message output by "vdo create --help" has the correct values.
I haven't checked the other values yet.
vdo-6.1.1.99-2.el7:
--vdoHashZoneThreads=thread count
Specifies the number of threads across which to subdivide parts of the VDO processing based on the hash value computed from the block data. The value must be at least 0 and less than or equal
to 100. vdoHashZonesThreads, vdoLogicalThreads and vdoPhysicalThreads must be either all zero or all non-zero. The default is 1.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2018:3094
The "vdo" man page says: --vdoHashZoneThreads=thread count Specifies the number of threads across which to subdivide parts of the VDO processing based on the hash value computed from the block data. The value must be at least 1 and less than or equal to 100. vdoHashZonesThreads, vdoLogicalThreads and vdoPhysi- calThreads must be either all zero or all non-zero. The default is 2. The minimum value is in fact 0, and the default is 1. The message output by "vdo create --help" has the correct values. I haven't checked the other values yet.