More info from the gdploy config:

action=create
devices=sda,sdb
names=vdo_sda,vdo_sdb
logicalsize=17000G,17000G
blockmapcachesize=128M
readcache=enabled
readcachesize=20M
emulate512=on
writepolicy=auto
ignore_vdo_errors=no
slabsize=32G,32G


action=create
devices=sda,sdb
names=vdo_sda,vdo_sdb
logicalsize=17000G,17000G
blockmapcachesize=128M
readcache=enabled
readcachesize=20M
emulate512=on
writepolicy=auto
ignore_vdo_errors=no
slabsize=32G,32G

On Tue, Jul 31, 2018 at 4:19 PM, Jayme <jaymef@gmail.com> wrote:
PLAY [gluster_servers] *********************************************************

TASK [Create VDO with specified size] ******************************************
failed: [HOST] (item={u'disk': u'/dev/sda', u'logicalsize': u'17000G', u'name': u'vdo_sda'}) => {"changed": false, "err": "usage: vdo create [-h] -n <volume> --device <devicepath>\n                  [--activate {disabled,enabled}]\n                  [--blockMapCacheSize <megabytes>]\n                  [--blockMapPeriod <period>]\n                  [--compression {disabled,enabled}]\n                  [--deduplication {disabled,enabled}]\n                  [--emulate512 {disabled,enabled}] [--force]\n                  [--indexMem <gigabytes>] [--readCache {disabled,enabled}]\n                  [--readCacheSize <megabytes>]\n                  [--sparseIndex {disabled,enabled}]\n                  [--vdoAckThreads <threadCount>]\n                  [--vdoBioRotationInterval <ioCount>]\n                  [--vdoBioThreads <threadCount>]\n                  [--vdoCpuThreads <threadCount>]\n                  [--vdoHashZoneThreads <threadCount>]\n                  [--vdoLogicalSize <megabytes>]\n                  [--vdoLogicalThreads <threadCount>]\n                  [--vdoLogLevel {critical,error,warning,notice,info,debug}]\n                  [--vdoPhysicalThreads <threadCount>]\n                  [--vdoSlabSize <megabytes>]\n                  [--writePolicy {async,sync,auto}] [-f <file>]\n                  [--logfile <pathname>] [--verbose]\nvdo create: error: argument --vdoSlabSize: must be an LVM-style size string\n", "item": {"disk": "/dev/sda", "logicalsize": "17000G", "name": "vdo_sda"}, "msg": "Creating VDO vdo_sda failed.", "rc": 2}
failed: [HOST] (item={u'disk': u'/dev/sdb', u'logicalsize': u'17000G', u'name': u'vdo_sdb'}) => {"changed": false, "err": "usage: vdo create [-h] -n <volume> --device <devicepath>\n                  [--activate {disabled,enabled}]\n                  [--blockMapCacheSize <megabytes>]\n                  [--blockMapPeriod <period>]\n                  [--compression {disabled,enabled}]\n                  [--deduplication {disabled,enabled}]\n                  [--emulate512 {disabled,enabled}] [--force]\n                  [--indexMem <gigabytes>] [--readCache {disabled,enabled}]\n                  [--readCacheSize <megabytes>]\n                  [--sparseIndex {disabled,enabled}]\n                  [--vdoAckThreads <threadCount>]\n                  [--vdoBioRotationInterval <ioCount>]\n                  [--vdoBioThreads <threadCount>]\n                  [--vdoCpuThreads <threadCount>]\n                  [--vdoHashZoneThreads <threadCount>]\n                  [--vdoLogicalSize <megabytes>]\n                  [--vdoLogicalThreads <threadCount>]\n                  [--vdoLogLevel {critical,error,warning,notice,info,debug}]\n                  [--vdoPhysicalThreads <threadCount>]\n                  [--vdoSlabSize <megabytes>]\n                  [--writePolicy {async,sync,auto}] [-f <file>]\n                  [--logfile <pathname>] [--verbose]\nvdo create: error: argument --vdoSlabSize: must be an LVM-style size string\n", "item": {"disk": "/dev/sdb", "logicalsize": "17000G", "name": "vdo_sdb"}, "msg": "Creating VDO vdo_sdb failed.", "rc": 2}
to retry, use: --limit @/tmp/tmpQQ9t92/vdo-create.retry

PLAY RECAP *********************************************************************
HOST : ok=0    changed=0    unreachable=0    failed=1