2 - I use this implementation of iSCSI http://jscsi.org/. And it is this class that saves my blobs http://grepcode.com/file/repo1.maven.org/maven2/org.jscsi/target/2.5.2/org/jscsi/target/storage/JCloudsStorageModule.java?av=f
As far as I can see, the questions you have are related to jSCSI, which is not part of jclouds. Have you tried asking on the jSCSI mailing list [1]?
ap [1] https://github.com/disy/jSCSI/blob/master/pom.xml#L65-L72
