diff --git a/logical/storage_inmem.go b/logical/storage_inmem.go
index 03e60118a..e0ff75f14 100644
--- a/logical/storage_inmem.go
+++ b/logical/storage_inmem.go
@@ -2,10 +2,10 @@ package logical
 
 import (
 	"context"
-	"strings"
 	"sync"
 
-	radix "github.com/armon/go-radix"
+	"github.com/hashicorp/vault/physical"
+	"github.com/hashicorp/vault/physical/inmem"
 )
 
 // InmemStorage implements Storage and stores all data in memory. It is
@@ -13,79 +13,55 @@ import (
 // having to load all of physical's dependencies (which are legion) just to
 // have some testing storage.
 type InmemStorage struct {
-	sync.RWMutex
-	root *radix.Tree
-	once sync.Once
+	underlying physical.Backend
+	once       sync.Once
 }
 
 func (s *InmemStorage) Get(ctx context.Context, key string) (*StorageEntry, error) {
 	s.once.Do(s.init)
 
-	s.RLock()
-	defer s.RUnlock()
-
-	if raw, ok := s.root.Get(key); ok {
-		se := raw.(*StorageEntry)
-		return &StorageEntry{
-			Key:   se.Key,
-			Value: se.Value,
-		}, nil
+	entry, err := s.underlying.Get(ctx, key)
+	if err != nil {
+		return nil, err
 	}
-
-	return nil, nil
+	if entry == nil {
+		return nil, nil
+	}
+	return &StorageEntry{
+		Key:      entry.Key,
+		Value:    entry.Value,
+		SealWrap: entry.SealWrap,
+	}, nil
 }
 
 func (s *InmemStorage) Put(ctx context.Context, entry *StorageEntry) error {
 	s.once.Do(s.init)
 
-	s.Lock()
-	defer s.Unlock()
-
-	s.root.Insert(entry.Key, &StorageEntry{
-		Key:   entry.Key,
-		Value: entry.Value,
+	return s.underlying.Put(ctx, &physical.Entry{
+		Key:      entry.Key,
+		Value:    entry.Value,
+		SealWrap: entry.SealWrap,
 	})
-	return nil
 }
 
 func (s *InmemStorage) Delete(ctx context.Context, key string) error {
 	s.once.Do(s.init)
 
-	s.Lock()
-	defer s.Unlock()
-
-	s.root.Delete(key)
-	return nil
+	return s.underlying.Delete(ctx, key)
 }
 
 func (s *InmemStorage) List(ctx context.Context, prefix string) ([]string, error) {
 	s.once.Do(s.init)
 
-	s.RLock()
-	defer s.RUnlock()
+	return s.underlying.List(ctx, prefix)
+}
 
-	var out []string
-	seen := make(map[string]interface{})
-	walkFn := func(s string, v interface{}) bool {
-		trimmed := strings.TrimPrefix(s, prefix)
-		sep := strings.Index(trimmed, "/")
-		if sep == -1 {
-			out = append(out, trimmed)
-		} else {
-			trimmed = trimmed[:sep+1]
-			if _, ok := seen[trimmed]; !ok {
-				out = append(out, trimmed)
-				seen[trimmed] = struct{}{}
-			}
-		}
-		return false
-	}
-	s.root.WalkPrefix(prefix, walkFn)
-
-	return out, nil
+func (s *InmemStorage) Underlying() *inmem.InmemBackend {
+	s.once.Do(s.init)
 
+	return s.underlying.(*inmem.InmemBackend)
 }
 
 func (s *InmemStorage) init() {
-	s.root = radix.New()
+	s.underlying, _ = inmem.NewInmem(nil, nil)
 }
diff --git a/physical/inmem/inmem.go b/physical/inmem/inmem.go
index 4501bab32..4bd577277 100644
--- a/physical/inmem/inmem.go
+++ b/physical/inmem/inmem.go
@@ -2,8 +2,10 @@ package inmem
 
 import (
 	"context"
+	"errors"
 	"strings"
 	"sync"
+	"sync/atomic"
 
 	"github.com/hashicorp/vault/physical"
 	log "github.com/mgutz/logxi/v1"
@@ -19,6 +21,13 @@ var _ physical.Lock = (*InmemLock)(nil)
 var _ physical.Transactional = (*TransactionalInmemBackend)(nil)
 var _ physical.Transactional = (*TransactionalInmemHABackend)(nil)
 
+var (
+	PutDisabledError    = errors.New("put operations disabled in inmem backend")
+	GetDisabledError    = errors.New("get operations disabled in inmem backend")
+	DeleteDisabledError = errors.New("delete operations disabled in inmem backend")
+	ListDisabledError   = errors.New("list operations disabled in inmem backend")
+)
+
 // InmemBackend is an in-memory only physical backend. It is useful
 // for testing and development situations where the data is not
 // expected to be durable.
@@ -27,6 +36,10 @@ type InmemBackend struct {
 	root       *radix.Tree
 	permitPool *physical.PermitPool
 	logger     log.Logger
+	FailGet    *uint32
+	FailPut    *uint32
+	FailDelete *uint32
+	FailList   *uint32
 }
 
 type TransactionalInmemBackend struct {
@@ -39,6 +52,10 @@ func NewInmem(_ map[string]string, logger log.Logger) (physical.Backend, error)
 		root:       radix.New(),
 		permitPool: physical.NewPermitPool(physical.DefaultParallelOperations),
 		logger:     logger,
+		FailGet:    new(uint32),
+		FailPut:    new(uint32),
+		FailDelete: new(uint32),
+		FailList:   new(uint32),
 	}
 	return in, nil
 }
@@ -51,6 +68,10 @@ func NewTransactionalInmem(_ map[string]string, logger log.Logger) (physical.Bac
 			root:       radix.New(),
 			permitPool: physical.NewPermitPool(1),
 			logger:     logger,
+			FailGet:    new(uint32),
+			FailPut:    new(uint32),
+			FailDelete: new(uint32),
+			FailList:   new(uint32),
 		},
 	}
 	return in, nil
@@ -68,6 +89,10 @@ func (i *InmemBackend) Put(ctx context.Context, entry *physical.Entry) error {
 }
 
 func (i *InmemBackend) PutInternal(ctx context.Context, entry *physical.Entry) error {
+	if i.FailPut != nil && atomic.LoadUint32(i.FailPut) != 0 {
+		return PutDisabledError
+	}
+
 	i.root.Insert(entry.Key, entry.Value)
 	return nil
 }
@@ -84,6 +109,10 @@ func (i *InmemBackend) Get(ctx context.Context, key string) (*physical.Entry, er
 }
 
 func (i *InmemBackend) GetInternal(ctx context.Context, key string) (*physical.Entry, error) {
+	if i.FailGet != nil && atomic.LoadUint32(i.FailGet) != 0 {
+		return nil, GetDisabledError
+	}
+
 	if raw, ok := i.root.Get(key); ok {
 		return &physical.Entry{
 			Key:   key,
@@ -105,6 +134,10 @@ func (i *InmemBackend) Delete(ctx context.Context, key string) error {
 }
 
 func (i *InmemBackend) DeleteInternal(ctx context.Context, key string) error {
+	if i.FailDelete != nil && atomic.LoadUint32(i.FailDelete) != 0 {
+		return DeleteDisabledError
+	}
+
 	i.root.Delete(key)
 	return nil
 }
@@ -122,6 +155,10 @@ func (i *InmemBackend) List(ctx context.Context, prefix string) ([]string, error
 }
 
 func (i *InmemBackend) ListInternal(prefix string) ([]string, error) {
+	if i.FailList != nil && atomic.LoadUint32(i.FailList) != 0 {
+		return nil, ListDisabledError
+	}
+
 	var out []string
 	seen := make(map[string]interface{})
 	walkFn := func(s string, v interface{}) bool {