diff --git a/api/api_full.go b/api/api_full.go
index 43587d58e..fc1d70d0f 100644
--- a/api/api_full.go
+++ b/api/api_full.go
@@ -191,7 +191,7 @@ type FullNode interface {
 	// ClientImport imports file under the specified path into filestore.
 	ClientImport(ctx context.Context, ref FileRef) (*ImportRes, error)
 	// ClientRemoveImport removes file import
-	ClientRemoveImport(ctx context.Context, importID int64) error
+	ClientRemoveImport(ctx context.Context, importID int) error
 	// ClientStartDeal proposes a deal with a miner.
 	ClientStartDeal(ctx context.Context, params *StartDealParams) (*cid.Cid, error)
 	// ClientGetDealInfo returns the latest information about a given deal.
@@ -393,11 +393,11 @@ type SectorLocation struct {
 
 type ImportRes struct {
 	Root     cid.Cid
-	ImportID int64
+	ImportID int
 }
 
 type Import struct {
-	Key int64
+	Key int
 	Err string
 
 	Root     *cid.Cid
diff --git a/api/apistruct/struct.go b/api/apistruct/struct.go
index 7e127b3d4..89edc1762 100644
--- a/api/apistruct/struct.go
+++ b/api/apistruct/struct.go
@@ -113,7 +113,7 @@ type FullNodeStruct struct {
 
 		ClientImport          func(ctx context.Context, ref api.FileRef) (*api.ImportRes, error)                                     `perm:"admin"`
 		ClientListImports     func(ctx context.Context) ([]api.Import, error)                                                        `perm:"write"`
-		ClientRemoveImport    func(ctx context.Context, importID int64) error                                                        `perm:"admin"`
+		ClientRemoveImport    func(ctx context.Context, importID int) error                                                          `perm:"admin"`
 		ClientHasLocal        func(ctx context.Context, root cid.Cid) (bool, error)                                                  `perm:"write"`
 		ClientFindData        func(ctx context.Context, root cid.Cid, piece *cid.Cid) ([]api.QueryOffer, error)                      `perm:"read"`
 		ClientMinerQueryOffer func(ctx context.Context, miner address.Address, root cid.Cid, piece *cid.Cid) (api.QueryOffer, error) `perm:"read"`
@@ -354,7 +354,7 @@ func (c *FullNodeStruct) ClientListImports(ctx context.Context) ([]api.Import, e
 	return c.Internal.ClientListImports(ctx)
 }
 
-func (c *FullNodeStruct) ClientRemoveImport(ctx context.Context, importID int64) error {
+func (c *FullNodeStruct) ClientRemoveImport(ctx context.Context, importID int) error {
 	return c.Internal.ClientRemoveImport(ctx, importID)
 }
 
diff --git a/cli/client.go b/cli/client.go
index 414c04cd8..7846dd243 100644
--- a/cli/client.go
+++ b/cli/client.go
@@ -140,14 +140,14 @@ var clientDropCmd = &cli.Command{
 		defer closer()
 		ctx := ReqContext(cctx)
 
-		var ids []int64
+		var ids []int
 		for i, s := range cctx.Args().Slice() {
-			id, err := strconv.ParseInt(s, 10, 64)
+			id, err := strconv.ParseInt(s, 10, 0)
 			if err != nil {
 				return xerrors.Errorf("parsing %d-th import ID: %w", i, err)
 			}
 
-			ids = append(ids, id)
+			ids = append(ids, int(id))
 		}
 
 		for _, id := range ids {
diff --git a/node/impl/client/client.go b/node/impl/client/client.go
index 3eb3736bc..16024a0da 100644
--- a/node/impl/client/client.go
+++ b/node/impl/client/client.go
@@ -296,7 +296,7 @@ func (a *API) ClientImport(ctx context.Context, ref api.FileRef) (*api.ImportRes
 	}, nil
 }
 
-func (a *API) ClientRemoveImport(ctx context.Context, importID int64) error {
+func (a *API) ClientRemoveImport(ctx context.Context, importID int) error {
 	return a.imgr().Remove(importID)
 }
 
diff --git a/node/modules/client.go b/node/modules/client.go
index 780aa91ee..a24709beb 100644
--- a/node/modules/client.go
+++ b/node/modules/client.go
@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"github.com/filecoin-project/lotus/lib/bufbstore"
+	"golang.org/x/xerrors"
 
 	blockstore "github.com/ipfs/go-ipfs-blockstore"
 	"github.com/libp2p/go-libp2p-core/host"
@@ -36,7 +37,12 @@ import (
 )
 
 func ClientMultiDatastore(lc fx.Lifecycle, r repo.LockedRepo) (dtypes.ClientMultiDstore, error) {
-	mds, err := importmgr.NewMultiDstore(r, "/client")
+	ds, err := r.Datastore("/client")
+	if err != nil {
+		return nil, xerrors.Errorf("getting datastore out of reop: %w", err)
+	}
+
+	mds, err := importmgr.NewMultiDstore(ds)
 	if err != nil {
 		return nil, err
 	}
diff --git a/node/repo/fsrepo.go b/node/repo/fsrepo.go
index 682983415..9a3ec9ca4 100644
--- a/node/repo/fsrepo.go
+++ b/node/repo/fsrepo.go
@@ -226,11 +226,10 @@ type fsLockedRepo struct {
 	repoType RepoType
 	closer   io.Closer
 
-	ds      map[string]datastore.Batching
-	multiDs map[string]map[int64]datastore.Batching
-	dsErr   error
-	dsOnce  sync.Once
-	dsLk    sync.Mutex
+	ds     map[string]datastore.Batching
+	dsErr  error
+	dsOnce sync.Once
+	dsLk   sync.Mutex
 
 	storageLk sync.Mutex
 	configLk  sync.Mutex
diff --git a/node/repo/fsrepo_ds.go b/node/repo/fsrepo_ds.go
index 473e4bafa..7075bda79 100644
--- a/node/repo/fsrepo_ds.go
+++ b/node/repo/fsrepo_ds.go
@@ -1,13 +1,11 @@
 package repo
 
 import (
-	"fmt"
-	"github.com/ipfs/go-datastore"
-	"golang.org/x/xerrors"
-	"io/ioutil"
 	"os"
 	"path/filepath"
-	"strconv"
+
+	"github.com/ipfs/go-datastore"
+	"golang.org/x/xerrors"
 
 	dgbadger "github.com/dgraph-io/badger/v2"
 	badger "github.com/ipfs/go-ds-badger2"
@@ -24,9 +22,7 @@ var fsDatastores = map[string]dsCtor{
 
 	// Those need to be fast for large writes... but also need a really good GC :c
 	"staging": badgerDs, // miner specific
-}
 
-var fsMultiDatastores = map[string]dsCtor{
 	"client": badgerDs, // client specific
 }
 
@@ -68,78 +64,11 @@ func (fsr *fsLockedRepo) openDatastores() (map[string]datastore.Batching, error)
 	return out, nil
 }
 
-func (fsr *fsLockedRepo) openMultiDatastores() (map[string]map[int64]datastore.Batching, error) {
-	out := map[string]map[int64]datastore.Batching{}
-
-	for p, ctor := range fsMultiDatastores {
-		path := fsr.join(filepath.Join(fsDatastore, p))
-		if err := os.MkdirAll(path, 0755); err != nil {
-			return nil, xerrors.Errorf("mkdir %s: %w", path, err)
-		}
-
-		di, err := ioutil.ReadDir(path)
-		if err != nil {
-			return nil, xerrors.Errorf("readdir '%s': %w", path, err)
-		}
-
-		out[p] = map[int64]datastore.Batching{}
-
-		for _, info := range di {
-			path := filepath.Join(path, info.Name())
-
-			prefix := datastore.NewKey(p)
-
-			id, err := strconv.ParseInt(info.Name(), 10, 64)
-			if err != nil {
-				log.Errorf("error parsing multi-datastore id for '%s': %w", path, err)
-				continue
-			}
-
-			// TODO: optimization: don't init datastores we don't need
-			ds, err := ctor(path)
-			if err != nil {
-				return nil, xerrors.Errorf("opening datastore %s: %w", prefix, err)
-			}
-
-			ds = measure.New("fsrepo."+p+"."+info.Name(), ds)
-
-			out[p][id] = ds
-		}
-	}
-
-	return out, nil
-}
-
-func (fsr *fsLockedRepo) openMultiDatastore(ns string, idx int64) (datastore.Batching, error) {
-	ctor, ok := fsMultiDatastores[ns]
-	if !ok {
-		return nil, xerrors.Errorf("no multi-datastore with namespace '%s'", ns)
-	}
-
-	si := fmt.Sprintf("%d", idx)
-	path := fsr.join(filepath.Join(fsDatastore, ns, si))
-
-	ds, err := ctor(path)
-	if err != nil {
-		return nil, xerrors.Errorf("opening datastore %s: %w", path, err)
-	}
-
-	ds = measure.New("fsrepo."+ns+"."+si, ds)
-
-	return ds, nil
-}
-
 func (fsr *fsLockedRepo) Datastore(ns string) (datastore.Batching, error) {
 	fsr.dsOnce.Do(func() {
-		var err error
-		fsr.ds, err = fsr.openDatastores()
-		if err != nil {
-			fsr.dsErr = err
-			return
-		}
-
-		fsr.multiDs, fsr.dsErr = fsr.openMultiDatastores()
+		fsr.ds, fsr.dsErr = fsr.openDatastores()
 	})
+
 	if fsr.dsErr != nil {
 		return nil, fsr.dsErr
 	}
@@ -147,99 +76,5 @@ func (fsr *fsLockedRepo) Datastore(ns string) (datastore.Batching, error) {
 	if ok {
 		return ds, nil
 	}
-
-	k := datastore.NewKey(ns)
-	parts := k.List()
-	if len(parts) != 2 {
-		return nil, xerrors.Errorf("expected multi-datastore namespace to have 2 parts")
-	}
-
-	fsr.dsLk.Lock()
-	defer fsr.dsLk.Unlock()
-
-	mds, ok := fsr.multiDs[parts[0]]
-	if !ok {
-		return nil, xerrors.Errorf("no multi-datastore with namespace %s", ns)
-	}
-
-	idx, err := strconv.ParseInt(parts[1], 10, 64)
-	if err != nil {
-		return nil, xerrors.Errorf("parsing mult-datastore index('%s'): %w", parts[1], err)
-	}
-
-	ds, ok = mds[idx]
-	if !ok {
-		ds, err = fsr.openMultiDatastore(parts[0], idx)
-		if err != nil {
-			return nil, xerrors.Errorf("opening multi-datastore: %w", err)
-		}
-
-		mds[idx] = ds
-	}
-
-	return ds, nil
-}
-
-func (fsr *fsLockedRepo) ListDatastores(ns string) ([]int64, error) {
-	k := datastore.NewKey(ns)
-	parts := k.List()
-	if len(parts) != 1 {
-		return nil, xerrors.Errorf("expected multi-datastore namespace to have 1 part")
-	}
-
-	fsr.dsLk.Lock()
-	defer fsr.dsLk.Unlock()
-
-	mds, ok := fsr.multiDs[parts[0]]
-	if !ok {
-		return nil, xerrors.Errorf("no multi-datastore with namespace %s", ns)
-	}
-
-	out := make([]int64, 0, len(mds))
-	for i := range mds {
-		out = append(out, i)
-	}
-
-	return out, nil
-}
-
-func (fsr *fsLockedRepo) DeleteDatastore(ns string) error {
-	k := datastore.NewKey(ns)
-	parts := k.List()
-	if len(parts) != 2 {
-		return xerrors.Errorf("expected multi-datastore namespace to have 2 parts")
-	}
-
-	mds, ok := fsr.multiDs[parts[0]]
-	if !ok {
-		return xerrors.Errorf("no multi-datastore with namespace %s", ns)
-	}
-
-	idx, err := strconv.ParseInt(parts[1], 10, 64)
-	if err != nil {
-		return xerrors.Errorf("parsing mult-datastore index('%s'): %w", parts[1], err)
-	}
-
-	fsr.dsLk.Lock()
-	defer fsr.dsLk.Unlock()
-
-	ds, ok := mds[idx]
-	if !ok {
-		return xerrors.Errorf("no multi-datastore with at index (namespace %s)", ns)
-	}
-
-	delete(mds, idx)
-
-	if err := ds.Close(); err != nil {
-		return xerrors.Errorf("closing datastore: %w", err)
-	}
-
-	path := fsr.join(filepath.Join(fsDatastore, parts[0], parts[1]))
-
-	log.Warnw("removing sub-datastore", "path", path, "namespace", ns)
-	if err := os.RemoveAll(path); err != nil {
-		return xerrors.Errorf("remove '%s': %w", path, err)
-	}
-
-	return nil
+	return nil, xerrors.Errorf("no such datastore: %s", ns)
 }
diff --git a/node/repo/importmgr/mgr.go b/node/repo/importmgr/mgr.go
index 464f4ac33..d3139918e 100644
--- a/node/repo/importmgr/mgr.go
+++ b/node/repo/importmgr/mgr.go
@@ -42,7 +42,7 @@ type StoreMeta struct {
 	Labels map[string]string
 }
 
-func (m *Mgr) NewStore() (int64, *Store, error) {
+func (m *Mgr) NewStore() (int, *Store, error) {
 	id := m.mds.Next()
 	st, err := m.mds.Get(id)
 	if err != nil {
@@ -60,7 +60,7 @@ func (m *Mgr) NewStore() (int64, *Store, error) {
 	return id, st, err
 }
 
-func (m *Mgr) AddLabel(id int64, key, value string) error { // source, file path, data CID..
+func (m *Mgr) AddLabel(id int, key, value string) error { // source, file path, data CID..
 	meta, err := m.ds.Get(datastore.NewKey(fmt.Sprintf("%d", id)))
 	if err != nil {
 		return xerrors.Errorf("getting metadata form datastore: %w", err)
@@ -81,11 +81,11 @@ func (m *Mgr) AddLabel(id int64, key, value string) error { // source, file path
 	return m.ds.Put(datastore.NewKey(fmt.Sprintf("%d", id)), meta)
 }
 
-func (m *Mgr) List() []int64 {
+func (m *Mgr) List() []int {
 	return m.mds.List()
 }
 
-func (m *Mgr) Info(id int64) (*StoreMeta, error) {
+func (m *Mgr) Info(id int) (*StoreMeta, error) {
 	meta, err := m.ds.Get(datastore.NewKey(fmt.Sprintf("%d", id)))
 	if err != nil {
 		return nil, xerrors.Errorf("getting metadata form datastore: %w", err)
@@ -99,7 +99,7 @@ func (m *Mgr) Info(id int64) (*StoreMeta, error) {
 	return &sm, nil
 }
 
-func (m *Mgr) Remove(id int64) error {
+func (m *Mgr) Remove(id int) error {
 	if err := m.mds.Delete(id); err != nil {
 		return xerrors.Errorf("removing import: %w", err)
 	}
diff --git a/node/repo/importmgr/multistore.go b/node/repo/importmgr/multistore.go
index 705a3c947..e45fc0278 100644
--- a/node/repo/importmgr/multistore.go
+++ b/node/repo/importmgr/multistore.go
@@ -1,44 +1,47 @@
 package importmgr
 
 import (
+	"encoding/json"
 	"fmt"
-	"path"
+	"sort"
 	"sync"
-	"sync/atomic"
 
-	"github.com/hashicorp/go-multierror"
+	"go.uber.org/multierr"
 	"golang.org/x/xerrors"
 
 	"github.com/ipfs/go-datastore"
+	ktds "github.com/ipfs/go-datastore/keytransform"
+	"github.com/ipfs/go-datastore/query"
 )
 
-type dsProvider interface {
-	Datastore(namespace string) (datastore.Batching, error)
-	ListDatastores(namespace string) ([]int64, error)
-	DeleteDatastore(namespace string) error
-}
-
 type MultiStore struct {
-	provider  dsProvider
-	namespace string
+	ds datastore.Batching
 
-	open map[int64]*Store
-	next int64
+	open map[int]*Store
+	next int
 
 	lk sync.RWMutex
 }
 
-func NewMultiDstore(provider dsProvider, namespace string) (*MultiStore, error) {
-	ids, err := provider.ListDatastores(namespace)
-	if err != nil {
-		return nil, xerrors.Errorf("listing datastores: %w", err)
+var dsListKey = datastore.NewKey("/list")
+var dsMultiKey = datastore.NewKey("/multi")
+
+func NewMultiDstore(ds datastore.Batching) (*MultiStore, error) {
+	listBytes, err := ds.Get(dsListKey)
+	if xerrors.Is(err, datastore.ErrNotFound) {
+		listBytes, _ = json.Marshal([]int{})
+	} else if err != nil {
+		return nil, xerrors.Errorf("could not read multistore list: %w", err)
+	}
+
+	var ids []int
+	if err := json.Unmarshal(listBytes, &ids); err != nil {
+		return nil, xerrors.Errorf("could not unmarshal multistore list: %w", err)
 	}
 
 	mds := &MultiStore{
-		provider:  provider,
-		namespace: namespace,
-
-		open: map[int64]*Store{},
+		ds:   ds,
+		open: map[int]*Store{},
 	}
 
 	for _, i := range ids {
@@ -55,15 +58,15 @@ func NewMultiDstore(provider dsProvider, namespace string) (*MultiStore, error)
 	return mds, nil
 }
 
-func (mds *MultiStore) path(i int64) string {
-	return path.Join("/", mds.namespace, fmt.Sprintf("%d", i))
+func (mds *MultiStore) Next() int {
+	mds.lk.Lock()
+	defer mds.lk.Unlock()
+
+	mds.next++
+	return mds.next
 }
 
-func (mds *MultiStore) Next() int64 {
-	return atomic.AddInt64(&mds.next, 1)
-}
-
-func (mds *MultiStore) Get(i int64) (*Store, error) {
+func (mds *MultiStore) Get(i int) (*Store, error) {
 	mds.lk.Lock()
 	defer mds.lk.Unlock()
 
@@ -72,40 +75,81 @@ func (mds *MultiStore) Get(i int64) (*Store, error) {
 		return store, nil
 	}
 
-	ds, err := mds.provider.Datastore(mds.path(i))
+	wds := ktds.Wrap(mds.ds, ktds.PrefixTransform{
+		Prefix: dsMultiKey.ChildString(fmt.Sprintf("%d", i)),
+	})
+
+	var err error
+	mds.open[i], err = openStore(wds)
+
+	stores := make([]int, 0, len(mds.open))
+	for k := range mds.open {
+		stores = append(stores, k)
+	}
+	sort.Ints(stores)
+
+	listBytes, err := json.Marshal(stores)
 	if err != nil {
-		return nil, err
+		return nil, xerrors.Errorf("could not marshal list: %w", err)
+	}
+	err = mds.ds.Put(dsListKey, listBytes)
+	if err != nil {
+		return nil, xerrors.Errorf("could not save stores list: %w", err)
 	}
 
-	mds.open[i], err = openStore(ds)
 	return mds.open[i], err
 }
 
-func (mds *MultiStore) List() []int64 {
+func (mds *MultiStore) List() []int {
 	mds.lk.RLock()
 	defer mds.lk.RUnlock()
-	out := make([]int64, 0, len(mds.open))
+
+	out := make([]int, 0, len(mds.open))
 	for i := range mds.open {
 		out = append(out, i)
 	}
+	sort.Ints(out)
 
 	return out
 }
 
-func (mds *MultiStore) Delete(i int64) error {
+func (mds *MultiStore) Delete(i int) error {
 	mds.lk.Lock()
 	defer mds.lk.Unlock()
 
 	store, ok := mds.open[i]
-	if ok {
-		if err := store.Close(); err != nil {
-			return xerrors.Errorf("closing sub-datastore %d: %w", i, err)
-		}
-
-		delete(mds.open, i)
+	if !ok {
+		return nil
+	}
+	delete(mds.open, i)
+	err := store.Close()
+	if err != nil {
+		return xerrors.Errorf("closing store: %w", err)
 	}
 
-	return mds.provider.DeleteDatastore(mds.path(i))
+	qres, err := store.ds.Query(query.Query{KeysOnly: true})
+	if err != nil {
+		return xerrors.Errorf("query error: %w", err)
+	}
+
+	b, err := store.ds.Batch()
+	if err != nil {
+		return xerrors.Errorf("batch error: %w", err)
+	}
+	for r := range qres.Next() {
+		if r.Error != nil {
+			_ = qres.Close()
+			_ = b.Commit()
+			return xerrors.Errorf("iterator error: %w", err)
+		}
+		b.Delete(datastore.NewKey(r.Key))
+	}
+	err = b.Commit()
+	if err != nil {
+		return xerrors.Errorf("commiting: %w", err)
+	}
+
+	return nil
 }
 
 func (mds *MultiStore) Close() error {
@@ -113,12 +157,10 @@ func (mds *MultiStore) Close() error {
 	defer mds.lk.Unlock()
 
 	var err error
-	for i, store := range mds.open {
-		cerr := store.Close()
-		if cerr != nil {
-			err = multierror.Append(err, xerrors.Errorf("closing sub-datastore %d: %w", i, cerr))
-		}
+	for _, s := range mds.open {
+		err = multierr.Append(err, s.Close())
 	}
+	mds.open = make(map[int]*Store)
 
 	return err
 }
diff --git a/node/repo/interface.go b/node/repo/interface.go
index c19a656af..17336d413 100644
--- a/node/repo/interface.go
+++ b/node/repo/interface.go
@@ -36,8 +36,6 @@ type LockedRepo interface {
 
 	// Returns datastore defined in this repo.
 	Datastore(namespace string) (datastore.Batching, error)
-	ListDatastores(namespace string) ([]int64, error)
-	DeleteDatastore(namespace string) error
 
 	// Returns config in this repo
 	Config() (interface{}, error)