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Description of problem:
According to help/manpage, --indexMem=0 should request default index memory size. 
 This value was accepted in vdo 6.1.0.0-6, but in vdo 6.1.0.34-8 this fails with:
vdo: error: option --indexMem: must be an index memory value

Version-Release number of selected component (if applicable):
vdo 6.1.0.34-8

How reproducible:
100%

Steps to Reproduce:
1.vdo create --device=DEVICE --name=NAME --indexMem=0

Actual results:
vdo: error: option --indexMem: must be an index memory value

Expected results:
vdo created with default index memory value

Additional info:

Have update help and man page to remove the reference to 0. Change should be available in VDO version 38 and greater.

Tested with vdo-6.1.0.46-9, both man vdo and vdo --help no longer mention possibility of --indexMem 0.

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/RHEA-2018:0871