We want to try to implement a backup (with nodetool snapshot)
We already created "/var/lib/cass/data/KEYSPACE1/snapshot" mount point with a NFS disk and when issued nodetool snapshot we got this message:
"....Requested snapshot for: KEYSPACE1 Exception in thread "main" java.io.IOError: java.io.IOException: Unable to create hard link from /var/lib/cassandra/data/KEYSPACE1/NOTIFICATIONS-hc-688-Statistics.db to /var/lib/cassandra/data/KEYSPACE1/snapshots/UNS_STORE_uns_cassandra/NOTIFICATIONS-hc-688-Statistics.db (errno 18)
It is possible to do that? Can we point to another directory?
If you don't bother, can you explain how snapshot internally works?
Thank you so much.