question: public void start ( ) throws IOException { logger . info ( String . format ( "Starting Storage process" ) ) ; ProcessBuilder startBuilder = process ( getStartCommand ( ) ) ; setStorageEnv ( startBuilder . environment ( ) ) ; Process starter = startBuilder . start ( ) ; try { sleeper . sleepQuietly ( SCRIPT_EXECUTE_WAIT_TIME_MS ) ; int code = starter . exitValue ( ) ; if ( code == 0 ) { logger . info ( "Storage process has been started" ) ; instanceState . setStorageProxyAlive ( true ) ; } else { logger . error ( "Unable to start Storage process. Error code: {}" , code ) ; } logProcessOutput ( starter ) ; } catch ( Exception e ) { logger . warn ( "Starting Storage process has an error" , e ) ; } }
target:  Start the storage engine (Redis, Memcached).