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nodetool datapaths

Displays the data file directories for the node.

Synopsis

nodetool [connection_options] datapaths

Description

nodetool datapaths shows the configured data directories for the Cassandra node. These are the filesystem paths where Cassandra stores SSTables and other data files.

Examples

Basic Usage

nodetool datapaths

Sample Output

/var/lib/cassandra/data

Or for multiple data directories:

/mnt/disk1/cassandra/data
/mnt/disk2/cassandra/data
/mnt/disk3/cassandra/data

Configuration

Data paths are configured in cassandra.yaml:

# cassandra.yaml
data_file_directories:
    - /var/lib/cassandra/data

# Or multiple directories:
data_file_directories:
    - /mnt/disk1/cassandra/data
    - /mnt/disk2/cassandra/data

Use Cases

Verify Configuration

# Confirm data directory paths
nodetool datapaths

Disk Space Monitoring

# Check space on data directories
for path in $(nodetool datapaths); do
    echo "$path: $(df -h $path | tail -1 | awk '{print $4}') free"
done

Troubleshooting

# Verify data directories exist and are accessible
nodetool datapaths | xargs -I {} ls -la {}

Best Practices

Data Path Guidelines

  1. Dedicated disks - Use separate disks for data
  2. Monitor space - Track disk usage per path
  3. Fast storage - SSDs recommended for data paths
  4. JBOD configuration - Multiple paths for JBOD setups
Command Relationship
info Node information including paths
tablestats Table disk usage
status Cluster overview