MapR manages raw, unformatted devices directly to optimize performance and offer high availability. For data nodes, allocate at least 3 unmounted physical drives or partitions for MapR storage. MapR uses disk spindles in parallel for faster read/write bandwidth and therefore groups disks into sets of three.
MapR-FS. Provide at least 8 GB of free disk space for MapR-FS.
Disk. Provide 10 GB of free disk space in the /tmp directory and 128 GB of free disk space in the /opt directory. Services, such as JobTracker and TaskTracker, use the /tmp directory. Files, such as logs and cores, use the /opt directory.
Swap space. Provide sufficient swap space for stability, 10% more than the node's physical memory, but not less than 24 GB and not more than 128 GB.
ZooKeeper. On ZooKeeper nodes, dedicate a partition, if practicable, for the /opt/mapr/zkdata directory to avoid other processes filling that partition with writes and to reduce the possibility of errors due to a full /opt/mapr/zkdata directory. This directory is used to store snapshots that are up to 64 MB. Since the four most recent snapshots are retained, reserve at least 500 MB for this partition. Do not share the physical disk where /opt/mapr/zkdata resides with any MapR File System data partitions to avoid I/O conflicts that might lead to ZooKeeper service failures.
Where should we do these partitions???????????????????