fix: support placement groups

Change-Id: I8b3dfef59dccdc29d1f584656edd1f3a88cd5711
feature: support provisioned IOPS

Change-Id: I4c67b093172bdbe1b854eebaa6e7e113c0b2ef15
Version bump to 6.1.8

Change-Id: I31e227dc31dcaf5e67095374d6c0acf1bb0b4364