Added translation from chunks to bytes in help and log (#308)

* added translation from chunks to bytes in help and log

cmd/bee/cmd/start.go

@@ -18,6 +18,7 @@ import (
 
 	"github.com/ethersphere/bee/pkg/logging"
 	"github.com/ethersphere/bee/pkg/node"
+	"github.com/ethersphere/bee/pkg/swarm"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )
@@ -151,7 +152,7 @@ func (c *command) initStartCmd() (err error) {
 	}
 
 	cmd.Flags().String(optionNameDataDir, filepath.Join(c.homeDir, ".bee"), "data directory")
-	cmd.Flags().Uint64(optionNameDBCapacity, 5000000, "db capacity in chunks")
+	cmd.Flags().Uint64(optionNameDBCapacity, 5000000, fmt.Sprintf("db capacity in chunks, multiply by %d to get approximate capacity in bytes", swarm.ChunkSize))
 	cmd.Flags().String(optionNamePassword, "", "password for decrypting keys")
 	cmd.Flags().String(optionNamePasswordFile, "", "path to a file that contains password for decrypting keys")
 	cmd.Flags().String(optionNameAPIAddr, ":8080", "HTTP API listen address")

pkg/localstore/localstore.go

@@ -166,7 +166,15 @@ func New(path string, baseKey []byte, o *Options, logger logging.Logger) (db *DB
 	if db.capacity == 0 {
 		db.capacity = defaultCapacity
 	}
-	db.logger.Infof("db capacity: %v", db.capacity)
+
+	capacityMB := float64(db.capacity*swarm.ChunkSize) * 9.5367431640625e-7
+
+	if capacityMB <= 1000 {
+		db.logger.Infof("database capacity: %d chunks (approximately %fMB)", db.capacity, capacityMB)
+	} else {
+		db.logger.Infof("database capacity: %d chunks (approximately %0.1fGB)", db.capacity, capacityMB/1000)
+	}
+
 	if maxParallelUpdateGC > 0 {
 		db.updateGCSem = make(chan struct{}, maxParallelUpdateGC)
 	}