diff --git a/localworker.go b/localworker.go
index a92f01a89..969007d93 100644
--- a/localworker.go
+++ b/localworker.go
@@ -58,7 +58,7 @@ type localWorkerPathProvider struct {
 }
 
 func (l *localWorkerPathProvider) AcquireSector(ctx context.Context, sector abi.SectorID, existing stores.SectorFileType, allocate stores.SectorFileType, sealing bool) (stores.SectorPaths, func(), error) {
-	paths, storageIDs, done, err := l.w.storage.AcquireSector(ctx, sector, existing, allocate, sealing)
+	paths, storageIDs, done, err := l.w.storage.AcquireSector(ctx, sector, l.w.scfg.SealProofType, existing, allocate, sealing)
 	if err != nil {
 		return stores.SectorPaths{}, nil, err
 	}
@@ -163,7 +163,7 @@ func (l *LocalWorker) FinalizeSector(ctx context.Context, sector abi.SectorID) e
 		return xerrors.Errorf("removing unsealed data: %w", err)
 	}
 
-	if err := l.storage.MoveStorage(ctx, sector, stores.FTSealed|stores.FTCache); err != nil {
+	if err := l.storage.MoveStorage(ctx, sector, l.scfg.SealProofType, stores.FTSealed|stores.FTCache); err != nil {
 		return xerrors.Errorf("moving sealed data to storage: %w", err)
 	}
 
diff --git a/resources.go b/resources.go
index 87058e80a..23dcc2085 100644
--- a/resources.go
+++ b/resources.go
@@ -4,21 +4,8 @@ import (
 	"github.com/filecoin-project/specs-actors/actors/abi"
 
 	"github.com/filecoin-project/sector-storage/sealtasks"
-	"github.com/filecoin-project/sector-storage/stores"
 )
 
-var FSOverheadSeal = map[stores.SectorFileType]int{ // 10x overheads
-	stores.FTUnsealed: 10,
-	stores.FTSealed:   10,
-	stores.FTCache:    70, // TODO: confirm for 32G
-}
-
-var FsOverheadFinalized = map[stores.SectorFileType]int{
-	stores.FTUnsealed: 10,
-	stores.FTSealed:   10,
-	stores.FTCache:    2,
-}
-
 type Resources struct {
 	MinMemory uint64 // What Must be in RAM for decent perf
 	MaxMemory uint64 // Memory required (swap + ram)
diff --git a/roprov.go b/roprov.go
index e6ec1e8f2..172cf7cf8 100644
--- a/roprov.go
+++ b/roprov.go
@@ -12,6 +12,7 @@ import (
 
 type readonlyProvider struct {
 	stor *stores.Local
+	spt  abi.RegisteredProof
 }
 
 func (l *readonlyProvider) AcquireSector(ctx context.Context, id abi.SectorID, existing stores.SectorFileType, allocate stores.SectorFileType, sealing bool) (stores.SectorPaths, func(), error) {
@@ -19,7 +20,7 @@ func (l *readonlyProvider) AcquireSector(ctx context.Context, id abi.SectorID, e
 		return stores.SectorPaths{}, nil, xerrors.New("read-only storage")
 	}
 
-	p, _, done, err := l.stor.AcquireSector(ctx, id, existing, allocate, sealing)
+	p, _, done, err := l.stor.AcquireSector(ctx, id, l.spt, existing, allocate, sealing)
 
 	return p, done, err
 }
diff --git a/sched.go b/sched.go
index 019febda4..c48440757 100644
--- a/sched.go
+++ b/sched.go
@@ -20,7 +20,7 @@ const mib = 1 << 20
 type WorkerAction func(ctx context.Context, w Worker) error
 
 type WorkerSelector interface {
-	Ok(ctx context.Context, task sealtasks.TaskType, a *workerHandle) (bool, error) // true if worker is acceptable for performing a task
+	Ok(ctx context.Context, task sealtasks.TaskType, spt abi.RegisteredProof, a *workerHandle) (bool, error) // true if worker is acceptable for performing a task
 
 	Cmp(ctx context.Context, task sealtasks.TaskType, a, b *workerHandle) (bool, error) // true if a is preferred over b
 }
@@ -178,7 +178,7 @@ func (sh *scheduler) onWorkerFreed(wid WorkerID) {
 	for i := 0; i < sh.schedQueue.Len(); i++ {
 		req := (*sh.schedQueue)[i]
 
-		ok, err := req.sel.Ok(req.ctx, req.taskType, w)
+		ok, err := req.sel.Ok(req.ctx, req.taskType, sh.spt, w)
 		if err != nil {
 			log.Errorf("onWorkerFreed req.sel.Ok error: %+v", err)
 			continue
@@ -212,7 +212,7 @@ func (sh *scheduler) maybeSchedRequest(req *workerRequest) (bool, error) {
 	needRes := ResourceTable[req.taskType][sh.spt]
 
 	for wid, worker := range sh.workers {
-		ok, err := req.sel.Ok(req.ctx, req.taskType, worker)
+		ok, err := req.sel.Ok(req.ctx, req.taskType, sh.spt, worker)
 		if err != nil {
 			return false, err
 		}
diff --git a/selector_alloc.go b/selector_alloc.go
index c7d06a7bc..0a7850424 100644
--- a/selector_alloc.go
+++ b/selector_alloc.go
@@ -5,26 +5,25 @@ import (
 
 	"golang.org/x/xerrors"
 
+	"github.com/filecoin-project/specs-actors/actors/abi"
+
 	"github.com/filecoin-project/sector-storage/sealtasks"
 	"github.com/filecoin-project/sector-storage/stores"
 )
 
 type allocSelector struct {
-	best []stores.StorageInfo
+	index stores.SectorIndex
+	alloc stores.SectorFileType
 }
 
 func newAllocSelector(ctx context.Context, index stores.SectorIndex, alloc stores.SectorFileType) (*allocSelector, error) {
-	best, err := index.StorageBestAlloc(ctx, alloc, true)
-	if err != nil {
-		return nil, err
-	}
-
 	return &allocSelector{
-		best: best,
+		index: index,
+		alloc: alloc,
 	}, nil
 }
 
-func (s *allocSelector) Ok(ctx context.Context, task sealtasks.TaskType, whnd *workerHandle) (bool, error) {
+func (s *allocSelector) Ok(ctx context.Context, task sealtasks.TaskType, spt abi.RegisteredProof, whnd *workerHandle) (bool, error) {
 	tasks, err := whnd.w.TaskTypes(ctx)
 	if err != nil {
 		return false, xerrors.Errorf("getting supported worker task types: %w", err)
@@ -43,7 +42,12 @@ func (s *allocSelector) Ok(ctx context.Context, task sealtasks.TaskType, whnd *w
 		have[path.ID] = struct{}{}
 	}
 
-	for _, info := range s.best {
+	best, err := s.index.StorageBestAlloc(ctx, s.alloc, spt, true)
+	if err != nil {
+		return false, xerrors.Errorf("finding best alloc storage: %w", err)
+	}
+
+	for _, info := range best {
 		if _, ok := have[info.ID]; ok {
 			return true, nil
 		}
diff --git a/selector_existing.go b/selector_existing.go
index 46dd3278e..14e6dbefd 100644
--- a/selector_existing.go
+++ b/selector_existing.go
@@ -5,9 +5,10 @@ import (
 
 	"golang.org/x/xerrors"
 
+	"github.com/filecoin-project/specs-actors/actors/abi"
+
 	"github.com/filecoin-project/sector-storage/sealtasks"
 	"github.com/filecoin-project/sector-storage/stores"
-	"github.com/filecoin-project/specs-actors/actors/abi"
 )
 
 type existingSelector struct {
@@ -25,7 +26,7 @@ func newExistingSelector(ctx context.Context, index stores.SectorIndex, sector a
 	}, nil
 }
 
-func (s *existingSelector) Ok(ctx context.Context, task sealtasks.TaskType, whnd *workerHandle) (bool, error) {
+func (s *existingSelector) Ok(ctx context.Context, task sealtasks.TaskType, spt abi.RegisteredProof, whnd *workerHandle) (bool, error) {
 	tasks, err := whnd.w.TaskTypes(ctx)
 	if err != nil {
 		return false, xerrors.Errorf("getting supported worker task types: %w", err)
diff --git a/selector_task.go b/selector_task.go
index 3298c9e5d..d2cf73476 100644
--- a/selector_task.go
+++ b/selector_task.go
@@ -5,6 +5,8 @@ import (
 
 	"golang.org/x/xerrors"
 
+	"github.com/filecoin-project/specs-actors/actors/abi"
+
 	"github.com/filecoin-project/sector-storage/sealtasks"
 	"github.com/filecoin-project/sector-storage/stores"
 )
@@ -17,7 +19,7 @@ func newTaskSelector() *taskSelector {
 	return &taskSelector{}
 }
 
-func (s *taskSelector) Ok(ctx context.Context, task sealtasks.TaskType, whnd *workerHandle) (bool, error) {
+func (s *taskSelector) Ok(ctx context.Context, task sealtasks.TaskType, spt abi.RegisteredProof, whnd *workerHandle) (bool, error) {
 	tasks, err := whnd.w.TaskTypes(ctx)
 	if err != nil {
 		return false, xerrors.Errorf("getting supported worker task types: %w", err)
diff --git a/stores/filetype.go b/stores/filetype.go
index 784b5b71e..1810054d8 100644
--- a/stores/filetype.go
+++ b/stores/filetype.go
@@ -17,6 +17,18 @@ const (
 	FTNone SectorFileType = 0
 )
 
+var FSOverheadSeal = map[SectorFileType]int{ // 10x overheads
+	FTUnsealed: 10,
+	FTSealed:   10,
+	FTCache:    70, // TODO: confirm for 32G
+}
+
+var FsOverheadFinalized = map[SectorFileType]int{
+	FTUnsealed: 10,
+	FTSealed:   10,
+	FTCache:    2,
+}
+
 type SectorFileType int
 
 func (t SectorFileType) String() string {
@@ -36,6 +48,29 @@ func (t SectorFileType) Has(singleType SectorFileType) bool {
 	return t&singleType == singleType
 }
 
+func (t SectorFileType) SealSpaceUse(spt abi.RegisteredProof) (uint64, error) {
+	ssize, err := spt.SectorSize()
+	if err != nil {
+		return 0, xerrors.Errorf("getting sector size: %w", err)
+	}
+
+	var need uint64
+	for _, pathType := range PathTypes {
+		if !t.Has(pathType) {
+			continue
+		}
+
+		oh, ok := FSOverheadSeal[pathType]
+		if !ok {
+			return 0, xerrors.Errorf("no seal overhead info for %s", pathType)
+		}
+
+		need += uint64(oh) * uint64(ssize) / 10
+	}
+
+	return need, nil
+}
+
 type SectorPaths struct {
 	Id abi.SectorID
 
diff --git a/stores/http_handler.go b/stores/http_handler.go
index b14dac54f..c39ca4510 100644
--- a/stores/http_handler.go
+++ b/stores/http_handler.go
@@ -68,7 +68,9 @@ func (handler *FetchHandler) remoteGetSector(w http.ResponseWriter, r *http.Requ
 		w.WriteHeader(500)
 		return
 	}
-	paths, _, done, err := handler.Local.AcquireSector(r.Context(), id, ft, FTNone, false)
+
+	// passing 0 spt because we don't allocate anything
+	paths, _, done, err := handler.Local.AcquireSector(r.Context(), id, 0, ft, FTNone, false)
 	if err != nil {
 		log.Error("%+v", err)
 		w.WriteHeader(500)
diff --git a/stores/index.go b/stores/index.go
index f0ff22a01..6659a4422 100644
--- a/stores/index.go
+++ b/stores/index.go
@@ -14,8 +14,8 @@ import (
 	"github.com/filecoin-project/specs-actors/actors/abi/big"
 )
 
-var HeartBeatInterval = 10 * time.Second
-var SkippedHeartbeatThresh = HeartBeatInterval * 5
+var HeartbeatInterval = 10 * time.Second
+var SkippedHeartbeatThresh = HeartbeatInterval * 5
 
 // ID identifies sector storage by UUID. One sector storage should map to one
 //  filesystem, local or networked / shared by multiple machines
@@ -47,7 +47,7 @@ type SectorIndex interface { // part of storage-miner api
 	StorageDropSector(ctx context.Context, storageId ID, s abi.SectorID, ft SectorFileType) error
 	StorageFindSector(ctx context.Context, sector abi.SectorID, ft SectorFileType, allowFetch bool) ([]StorageInfo, error)
 
-	StorageBestAlloc(ctx context.Context, allocate SectorFileType, sealing bool) ([]StorageInfo, error)
+	StorageBestAlloc(ctx context.Context, allocate SectorFileType, spt abi.RegisteredProof, sealing bool) ([]StorageInfo, error)
 }
 
 type Decl struct {
@@ -302,12 +302,17 @@ func (i *Index) StorageInfo(ctx context.Context, id ID) (StorageInfo, error) {
 	return *si.info, nil
 }
 
-func (i *Index) StorageBestAlloc(ctx context.Context, allocate SectorFileType, sealing bool) ([]StorageInfo, error) {
+func (i *Index) StorageBestAlloc(ctx context.Context, allocate SectorFileType, spt abi.RegisteredProof, sealing bool) ([]StorageInfo, error) {
 	i.lk.RLock()
 	defer i.lk.RUnlock()
 
 	var candidates []storageEntry
 
+	spaceReq, err := allocate.SealSpaceUse(spt)
+	if err != nil {
+		return nil, xerrors.Errorf("estimating required space: %w", err)
+	}
+
 	for _, p := range i.stores {
 		if sealing && !p.info.CanSeal {
 			continue
@@ -316,7 +321,20 @@ func (i *Index) StorageBestAlloc(ctx context.Context, allocate SectorFileType, s
 			continue
 		}
 
-		// TODO: filter out of space
+		if spaceReq > p.fsi.Available {
+			log.Debugf("not allocating on %s, out of space (available: %d, need: %d)", p.info.ID, p.fsi.Available, spaceReq)
+			continue
+		}
+
+		if time.Since(p.lastHeartbeat) > SkippedHeartbeatThresh {
+			log.Debugf("not allocating on %s, didn't receive heartbeats for %s", p.info.ID, time.Since(p.lastHeartbeat))
+			continue
+		}
+
+		if p.heartbeatErr != nil {
+			log.Debugf("not allocating on %s, heartbeat error: %s", p.info.ID, p.heartbeatErr)
+			continue
+		}
 
 		candidates = append(candidates, *p)
 	}
diff --git a/stores/interface.go b/stores/interface.go
index 556cd4dbf..4a1361904 100644
--- a/stores/interface.go
+++ b/stores/interface.go
@@ -10,11 +10,11 @@ import (
 )
 
 type Store interface {
-	AcquireSector(ctx context.Context, s abi.SectorID, existing SectorFileType, allocate SectorFileType, sealing bool) (paths SectorPaths, stores SectorPaths, done func(), err error)
+	AcquireSector(ctx context.Context, s abi.SectorID, spt abi.RegisteredProof, existing SectorFileType, allocate SectorFileType, sealing bool) (paths SectorPaths, stores SectorPaths, done func(), err error)
 	Remove(ctx context.Context, s abi.SectorID, types SectorFileType) error
 
 	// move sectors into storage
-	MoveStorage(ctx context.Context, s abi.SectorID, types SectorFileType) error
+	MoveStorage(ctx context.Context, s abi.SectorID, spt abi.RegisteredProof, types SectorFileType) error
 
 	FsStat(ctx context.Context, id ID) (FsStat, error)
 }
diff --git a/stores/local.go b/stores/local.go
index 673583c6a..52ba0afbc 100644
--- a/stores/local.go
+++ b/stores/local.go
@@ -164,7 +164,7 @@ func (st *Local) open(ctx context.Context) error {
 
 func (st *Local) reportHealth(ctx context.Context) {
 	// randomize interval by ~10%
-	interval := (HeartBeatInterval*100_000 + time.Duration(rand.Int63n(10_000))) / 100_000
+	interval := (HeartbeatInterval*100_000 + time.Duration(rand.Int63n(10_000))) / 100_000
 
 	for {
 		select {
@@ -195,7 +195,7 @@ func (st *Local) reportHealth(ctx context.Context) {
 	}
 }
 
-func (st *Local) AcquireSector(ctx context.Context, sid abi.SectorID, existing SectorFileType, allocate SectorFileType, sealing bool) (SectorPaths, SectorPaths, func(), error) {
+func (st *Local) AcquireSector(ctx context.Context, sid abi.SectorID, spt abi.RegisteredProof, existing SectorFileType, allocate SectorFileType, sealing bool) (SectorPaths, SectorPaths, func(), error) {
 	if existing|allocate != existing^allocate {
 		return SectorPaths{}, SectorPaths{}, nil, xerrors.New("can't both find and allocate a sector")
 	}
@@ -240,7 +240,7 @@ func (st *Local) AcquireSector(ctx context.Context, sid abi.SectorID, existing S
 			continue
 		}
 
-		sis, err := st.index.StorageBestAlloc(ctx, fileType, sealing)
+		sis, err := st.index.StorageBestAlloc(ctx, fileType, spt, sealing)
 		if err != nil {
 			st.localLk.RUnlock()
 			return SectorPaths{}, SectorPaths{}, nil, xerrors.Errorf("finding best storage for allocating : %w", err)
@@ -352,14 +352,14 @@ func (st *Local) Remove(ctx context.Context, sid abi.SectorID, typ SectorFileTyp
 	return nil
 }
 
-func (st *Local) MoveStorage(ctx context.Context, s abi.SectorID, types SectorFileType) error {
-	dest, destIds, sdone, err := st.AcquireSector(ctx, s, FTNone, types, false)
+func (st *Local) MoveStorage(ctx context.Context, s abi.SectorID, spt abi.RegisteredProof, types SectorFileType) error {
+	dest, destIds, sdone, err := st.AcquireSector(ctx, s, spt, FTNone, types, false)
 	if err != nil {
 		return xerrors.Errorf("acquire dest storage: %w", err)
 	}
 	defer sdone()
 
-	src, srcIds, ddone, err := st.AcquireSector(ctx, s, types, FTNone, false)
+	src, srcIds, ddone, err := st.AcquireSector(ctx, s, spt, types, FTNone, false)
 	if err != nil {
 		return xerrors.Errorf("acquire src storage: %w", err)
 	}
diff --git a/stores/remote.go b/stores/remote.go
index a750d4841..c5d570ffa 100644
--- a/stores/remote.go
+++ b/stores/remote.go
@@ -41,7 +41,7 @@ func NewRemote(local *Local, index SectorIndex, auth http.Header) *Remote {
 	}
 }
 
-func (r *Remote) AcquireSector(ctx context.Context, s abi.SectorID, existing SectorFileType, allocate SectorFileType, sealing bool) (SectorPaths, SectorPaths, func(), error) {
+func (r *Remote) AcquireSector(ctx context.Context, s abi.SectorID, spt abi.RegisteredProof, existing SectorFileType, allocate SectorFileType, sealing bool) (SectorPaths, SectorPaths, func(), error) {
 	if existing|allocate != existing^allocate {
 		return SectorPaths{}, SectorPaths{}, nil, xerrors.New("can't both find and allocate a sector")
 	}
@@ -73,7 +73,7 @@ func (r *Remote) AcquireSector(ctx context.Context, s abi.SectorID, existing Sec
 		r.fetchLk.Unlock()
 	}()
 
-	paths, stores, done, err := r.local.AcquireSector(ctx, s, existing, allocate, sealing)
+	paths, stores, done, err := r.local.AcquireSector(ctx, s, spt, existing, allocate, sealing)
 	if err != nil {
 		return SectorPaths{}, SectorPaths{}, nil, xerrors.Errorf("local acquire error: %w", err)
 	}
@@ -87,7 +87,7 @@ func (r *Remote) AcquireSector(ctx context.Context, s abi.SectorID, existing Sec
 			continue
 		}
 
-		ap, storageID, url, rdone, err := r.acquireFromRemote(ctx, s, fileType, sealing)
+		ap, storageID, url, rdone, err := r.acquireFromRemote(ctx, s, spt, fileType, sealing)
 		if err != nil {
 			done()
 			return SectorPaths{}, SectorPaths{}, nil, err
@@ -111,7 +111,7 @@ func (r *Remote) AcquireSector(ctx context.Context, s abi.SectorID, existing Sec
 	return paths, stores, done, nil
 }
 
-func (r *Remote) acquireFromRemote(ctx context.Context, s abi.SectorID, fileType SectorFileType, sealing bool) (string, ID, string, func(), error) {
+func (r *Remote) acquireFromRemote(ctx context.Context, s abi.SectorID, spt abi.RegisteredProof, fileType SectorFileType, sealing bool) (string, ID, string, func(), error) {
 	si, err := r.index.StorageFindSector(ctx, s, fileType, false)
 	if err != nil {
 		return "", "", "", nil, err
@@ -125,7 +125,7 @@ func (r *Remote) acquireFromRemote(ctx context.Context, s abi.SectorID, fileType
 		return si[i].Weight < si[j].Weight
 	})
 
-	apaths, ids, done, err := r.local.AcquireSector(ctx, s, FTNone, fileType, sealing)
+	apaths, ids, done, err := r.local.AcquireSector(ctx, s, spt, FTNone, fileType, sealing)
 	if err != nil {
 		return "", "", "", nil, xerrors.Errorf("allocate local sector for fetching: %w", err)
 	}
@@ -203,15 +203,15 @@ func (r *Remote) fetch(ctx context.Context, url, outname string) error {
 	}
 }
 
-func (r *Remote) MoveStorage(ctx context.Context, s abi.SectorID, types SectorFileType) error {
+func (r *Remote) MoveStorage(ctx context.Context, s abi.SectorID, spt abi.RegisteredProof, types SectorFileType) error {
 	// Make sure we have the data local
-	_, _, ddone, err := r.AcquireSector(ctx, s, types, FTNone, false)
+	_, _, ddone, err := r.AcquireSector(ctx, s, spt, types, FTNone, false)
 	if err != nil {
 		return xerrors.Errorf("acquire src storage (remote): %w", err)
 	}
 	ddone()
 
-	return r.local.MoveStorage(ctx, s, types)
+	return r.local.MoveStorage(ctx, s, spt, types)
 }
 
 func (r *Remote) Remove(ctx context.Context, sid abi.SectorID, typ SectorFileType) error {