Hi , I have a requirement for Hadoop Implementation against external shared storage in a virtualized environment . In order to implement this I need to understand
a) Hadoop replication behaviour with external storage where disks are allocated to data nodes as logical volumes . If I want to implement in such a way that if 2 replicas of data blocks are getting allocated on same node then hadoop counts it as 1 replica . b) Is there any feature where by hadoop has awareness of Storage Volume LUN-IDs and can accordingly place data block replicas . c) Is there any study available for hdfs read/write behavior against storage easy-tiering feature . Thanks Ashish
