filerOptions.collection=cmdServer.Flag.String("filer.collection","","all data will be stored in this collection")
filerOptions.port=cmdServer.Flag.Int("filer.port",8888,"filer server http listen port")
filerOptions.grpcPort=cmdServer.Flag.Int("filer.port.grpc",0,"filer grpc server listen port, default to http port + 10000")
filerOptions.publicPort=cmdServer.Flag.Int("filer.port.public",0,"filer server public http listen port")
filerOptions.defaultReplicaPlacement=cmdServer.Flag.String("filer.defaultReplicaPlacement","","Default replication type if not specified during runtime.")
filerOptions.redirectOnRead=cmdServer.Flag.Bool("filer.redirectOnRead",false,"whether proxy or redirect to volume server during file GET request")