Arvados

• GET /index.txt → one line per block stored on disk: hash+size <space> modtime_unix_timestamp
• GET /status.json → a json document something like this

{
 "volumes":[
  {"mount_point":"/data/disk0","bytes_free":4882337792,"bytes_used":5149708288},
  {"mount_point":"/data/disk1","bytes_free":39614472192,"bytes_used":3314229248}
 ]
}