diff --git a/mypy.ini b/mypy.ini
--- a/mypy.ini
+++ b/mypy.ini
@@ -19,3 +19,6 @@
 
 [mypy-rados.*]
 ignore_missing_imports = True
+
+[mypy-requests_toolbelt.*]
+ignore_missing_imports = True
diff --git a/requirements-test.txt b/requirements-test.txt
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -2,5 +2,7 @@
 azure-storage-blob >= 12.0, != 12.9.0  # version 12.9.0 breaks mypy https://github.com/Azure/azure-sdk-for-python/pull/20891
 pytest
 python-cephlibs
+requests_mock[fixture] >= 1.9
+requests_toolbelt
 types-pyyaml
 types-requests
diff --git a/requirements.txt b/requirements.txt
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,7 @@
 # remote storage API server
 aiohttp >= 3
 click
+requests
 
 # optional dependencies
 # apache-libcloud
diff --git a/swh/objstorage/backends/seaweed.py b/swh/objstorage/backends/seaweed.py
--- a/swh/objstorage/backends/seaweed.py
+++ b/swh/objstorage/backends/seaweed.py
@@ -4,12 +4,15 @@
 # See top-level LICENSE file for more information
 
 import io
+from itertools import islice
 import logging
+from typing import Iterator, Optional
 from urllib.parse import urljoin, urlparse
 
 import requests
 
 from swh.model import hashutil
+from swh.objstorage.backends.pathslicing import PathSlicer
 from swh.objstorage.exc import Error, ObjNotFoundError
 from swh.objstorage.objstorage import (
     DEFAULT_LIMIT,
@@ -30,47 +33,102 @@
     """
 
     def __init__(self, url):
+        if url.endswith("/"):
+            url = url[:-1]
         self.url = url
+        self.baseurl = urljoin(url, "/")
+        self.basepath = urlparse(url).path
+
+        self.session = requests.Session()
+        self.session.headers["Accept"] = "application/json"
+
+        self.batchsize = DEFAULT_LIMIT
+
+    def build_url(self, path):
+        assert path == self.basepath or path.startswith(self.basepath)
+        return urljoin(self.baseurl, path)
 
     def get(self, remote_path):
-        url = urljoin(self.url, remote_path)
+        url = self.build_url(remote_path)
         LOGGER.debug("Get file %s", url)
-        return requests.get(url).content
+        resp = self.session.get(url)
+        resp.raise_for_status()
+        return resp.content
 
     def exists(self, remote_path):
-        url = urljoin(self.url, remote_path)
+        url = self.build_url(remote_path)
         LOGGER.debug("Check file %s", url)
-        return requests.head(url).status_code == 200
+        return self.session.head(url).status_code == 200
 
     def put(self, fp, remote_path):
-        url = urljoin(self.url, remote_path)
+        url = self.build_url(remote_path)
         LOGGER.debug("Put file %s", url)
-        return requests.post(url, files={"file": fp})
+        return self.session.post(url, files={"file": fp})
 
     def delete(self, remote_path):
-        url = urljoin(self.url, remote_path)
+        url = self.build_url(remote_path)
         LOGGER.debug("Delete file %s", url)
-        return requests.delete(url)
+        return self.session.delete(url)
+
+    def iterfiles(
+        self, dir: str, last_file_name: Optional[str] = None
+    ) -> Iterator[str]:
+        """Recursively yield absolute file names
 
-    def list(self, dir, last_file_name=None, limit=DEFAULT_LIMIT):
-        """list sub folders and files of @dir. show a better look if you turn on
+        Args:
+            dir (str): retrieve file names starting from this directory; must
+                be an absolute path.
+            last_file_name (str): if given, starts from the file just after; must
+                be basename.
 
-        returns a dict of "sub-folders and files"
+        Yields:
+            absolute file names
 
         """
-        d = dir if dir.endswith("/") else (dir + "/")
-        url = urljoin(self.url, d)
-        headers = {"Accept": "application/json"}
-        params = {"limit": limit}
+        if dir.endswith("/"):
+            dir = dir[:-1]
+
+        # first, generates files going "down"
+        yield from self._iter_files(dir, last_file_name)
+
+        # then, continue iterate going up the tree
+        while True:
+            dir, last = dir.rsplit("/", 1)
+            if not (dir + "/").startswith(self.basepath):
+                # we are done
+                break
+            yield from self._iter_files(dir, last_file_name=last)
+
+    def _iter_files(
+        self, dir: str, last_file_name: Optional[str] = None
+    ) -> Iterator[str]:
+        for entry in self._iter_one_dir(dir, last_file_name):
+            fullpath = entry["FullPath"]
+            if entry["Mode"] & 1 << 31:  # it's a directory, recurse
+                yield from self._iter_files(fullpath)
+            else:
+                yield fullpath
+
+    def _iter_one_dir(self, remote_path, last_file_name=None):
+        url = self.build_url(remote_path)
+        params = {"limit": self.batchsize}
         if last_file_name:
             params["lastFileName"] = last_file_name
 
         LOGGER.debug("List directory %s", url)
-        rsp = requests.get(url, params=params, headers=headers)
-        if rsp.ok:
-            return rsp.json()
-        else:
-            LOGGER.error('Error listing "%s". [HTTP %d]' % (url, rsp.status_code))
+        while True:
+            rsp = self.session.get(url, params=params)
+            if rsp.ok:
+                dircontent = rsp.json()
+                if dircontent["Entries"]:
+                    yield from dircontent["Entries"]
+                if not dircontent["ShouldDisplayLoadMore"]:
+                    break
+                params["lastFileName"] = dircontent["LastFileName"]
+
+            else:
+                LOGGER.error('Error listing "%s". [HTTP %d]' % (url, rsp.status_code))
+                break
 
 
 class WeedObjStorage(ObjStorage):
@@ -79,10 +137,15 @@
     https://github.com/chrislusf/seaweedfs/wiki/Filer-Server-API
     """
 
-    def __init__(self, url="http://127.0.0.1:8888/swh", compression=None, **kwargs):
+    def __init__(
+        self, url="http://127.0.0.1:8888/swh", compression=None, slicing="", **kwargs
+    ):
         super().__init__(**kwargs)
         self.wf = WeedFiler(url)
         self.root_path = urlparse(url).path
+        if not self.root_path.endswith("/"):
+            self.root_path += "/"
+        self.slicer = PathSlicer(self.root_path, slicing)
         self.compression = compression
 
     def check_config(self, *, check_write):
@@ -176,15 +239,19 @@
 
     def list_content(self, last_obj_id=None, limit=DEFAULT_LIMIT):
         if last_obj_id:
-            last_obj_id = hashutil.hash_to_hex(last_obj_id)
-        resp = self.wf.list(self.root_path, last_obj_id, limit)
-        if resp is not None:
-            entries = resp["Entries"]
-            if entries:
-                for obj in entries:
-                    if obj is not None:
-                        bytehex = obj["FullPath"].rsplit("/", 1)[-1]
-                        yield hashutil.bytehex_to_hash(bytehex.encode())
+            objid = hashutil.hash_to_hex(last_obj_id)
+            objpath = self._path(objid)
+            startdir, lastfilename = objpath.rsplit("/", 1)
+        else:
+            startdir = self.root_path
+            lastfilename = None
+        # startdir = self.wf.build_url(startdir)
+
+        for fname in islice(
+            self.wf.iterfiles(startdir, last_file_name=lastfilename), limit
+        ):
+            bytehex = fname.rsplit("/", 1)[-1]
+            yield hashutil.bytehex_to_hash(bytehex.encode())
 
     # internal methods
     def _put_object(self, content, obj_id):
@@ -206,4 +273,4 @@
         self.wf.put(io.BytesIO(b"".join(compressor(content))), self._path(obj_id))
 
     def _path(self, obj_id):
-        return hashutil.hash_to_hex(obj_id)
+        return self.slicer.get_path(hashutil.hash_to_hex(obj_id))
diff --git a/swh/objstorage/tests/test_objstorage_seaweedfs.py b/swh/objstorage/tests/test_objstorage_seaweedfs.py
--- a/swh/objstorage/tests/test_objstorage_seaweedfs.py
+++ b/swh/objstorage/tests/test_objstorage_seaweedfs.py
@@ -3,50 +3,218 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
+from itertools import dropwhile, islice
+import json
+import os
 import unittest
 
-from swh.objstorage.backends.seaweed import DEFAULT_LIMIT, WeedObjStorage
+from requests.utils import get_encoding_from_headers
+import requests_mock
+from requests_mock.contrib import fixture
+
+from swh.objstorage.backends.pathslicing import PathSlicer
+from swh.objstorage.backends.seaweed import WeedObjStorage
 from swh.objstorage.exc import Error
 from swh.objstorage.objstorage import decompressors
 from swh.objstorage.tests.objstorage_testing import ObjStorageTestFixture
 
 
-class MockWeedFiler:
-    """ WeedFiler mock that replicates its API """
+class PathDict:
+    """A dict-like object that handles "path-like" keys in a recursive dict
+    structure.
+
+    For example:
+
+        >>> a = PathDict()
+        >>> a['path/to/file'] = 'some file content'
+
+    will create a dict structure (in self.data) like:
+
+        >>> print(a.data)
+        {'path': {'to': {'file': 'some file content'}}}
+        >>> 'path/to/file' in a
+        True
+
+    This is a helper class for the FilerRequestsMock below.
+    """
+
+    def __init__(self):
+        self.data = {}
+
+    def __setitem__(self, key, value):
+        if key.endswith("/"):
+            raise ValueError("Nope")
+        if key.startswith("/"):
+            key = key[1:]
+        path = key.split("/")
+        resu = self.data
+        for p in path[:-1]:
+            resu = resu.setdefault(p, {})
+        resu[path[-1]] = value
+
+    def __getitem__(self, key):
+        assert isinstance(key, str)
+        if key.startswith("/"):
+            key = key[1:]
+        if key.endswith("/"):
+            key = key[:-1]
+
+        path = key.split("/")
+        resu = self.data
+        for p in path:
+            resu = resu[p]
+        return resu
+
+    def __delitem__(self, key):
+        if key.startswith("/"):
+            key = key[1:]
+        if key.endswith("/"):
+            key = key[:-1]
+        path = key.split("/")
+        resu = self.data
+        for p in path[:-1]:
+            resu = resu.setdefault(p, {})
+        del resu[path[-1]]
+
+    def __contains__(self, key):
+        try:
+            self[key]
+            return True
+        except KeyError:
+            return False
+
+    def flat(self):
+        def go(d):
+            for k, v in d.items():
+                if isinstance(v, dict):
+                    yield from go(v)
+                else:
+                    yield k
+
+        yield from go(self.data)
+
+
+class FilerRequestsMock:
+    """This is a requests_mock based mock for the seaweedfs Filer API
+
+    It does not implement the whole API, only the parts required to make the
+    WeedFiler (used by WeedObjStorage) work.
+
+    It stores the files in a dict-based structure, eg. the file
+    '0a/32/0a3245983255' will be stored in a dict like:
+
+        {'0a': {'32': {'0a3245983255': b'content'}}}
 
-    def __init__(self, url):
-        self.url = url
-        self.content = {}
+    It uses the PathDict helper class to make it a bit easier to handle this
+    dict structure.
 
-    def get(self, remote_path):
-        return self.content[remote_path]
+    """
 
-    def put(self, fp, remote_path):
-        self.content[remote_path] = fp.read()
+    MODE_DIR = 0o20000000771
+    MODE_FILE = 0o660
 
-    def exists(self, remote_path):
-        return remote_path in self.content
+    def __init__(self):
+        self.content = PathDict()
+        self.requests_mock = fixture.Fixture()
+        self.requests_mock.setUp()
+        self.requests_mock.register_uri(
+            requests_mock.GET, requests_mock.ANY, content=self.get_cb
+        )
+        self.requests_mock.register_uri(
+            requests_mock.POST, requests_mock.ANY, content=self.post_cb
+        )
+        self.requests_mock.register_uri(
+            requests_mock.HEAD, requests_mock.ANY, content=self.head_cb
+        )
+        self.requests_mock.register_uri(
+            requests_mock.DELETE, requests_mock.ANY, content=self.delete_cb
+        )
 
-    def delete(self, remote_path):
-        del self.content[remote_path]
+    def head_cb(self, request, context):
+        if request.path not in self.content:
+            context.status_code = 404
 
-    def list(self, dir, last_file_name=None, limit=DEFAULT_LIMIT):
-        keys = sorted(self.content.keys())
-        if last_file_name is None:
-            idx = 0
+    def get_cb(self, request, context):
+        content = None
+        if request.path not in self.content:
+            context.status_code = 404
         else:
-            idx = keys.index(last_file_name) + 1
-        return {"Entries": [{"FullPath": x} for x in keys[idx : idx + limit]]}
+            content = self.content[request.path]
+            if isinstance(content, dict):
+                if "limit" in request.qs:
+                    limit = int(request.qs["limit"][0])
+                    assert limit > 0
+                else:
+                    limit = None
+
+                items = sorted(content.items())
+                if items and "lastfilename" in request.qs:
+                    lastfilename = request.qs["lastfilename"][0]
+                    # exclude all filenames up to lastfilename
+                    items = dropwhile(
+                        lambda kv: kv[0].split("/")[-1] <= lastfilename, items
+                    )
+
+                if limit:
+                    # +1 to easily detect if there are more
+                    items = islice(items, limit + 1)
+
+                entries = [
+                    {
+                        "FullPath": os.path.join(request.path, fname),
+                        "Mode": self.MODE_DIR
+                        if isinstance(obj, dict)
+                        else self.MODE_FILE,
+                    }
+                    for fname, obj in items
+                ]
+
+                thereismore = False
+                if limit and len(entries) > limit:
+                    entries = entries[:limit]
+                    thereismore = True
+
+                if entries:
+                    lastfilename = entries[-1]["FullPath"].split("/")[-1]
+                else:
+                    lastfilename = None
+                text = json.dumps(
+                    {
+                        "Path": request.path,
+                        "Limit": limit,
+                        "LastFileName": lastfilename,
+                        "ShouldDisplayLoadMore": thereismore,
+                        "Entries": entries,
+                    }
+                )
+                encoding = get_encoding_from_headers(request.headers) or "utf-8"
+                content = text.encode(encoding)
+        return content
+
+    def post_cb(self, request, context):
+        from requests_toolbelt.multipart import decoder
+
+        multipart_data = decoder.MultipartDecoder(
+            request.body, request.headers["content-type"]
+        )
+        part = multipart_data.parts[0]
+        self.content[request.path] = part.content
+
+    def delete_cb(self, request, context):
+        del self.content[request.path]
 
 
 class TestWeedObjStorage(ObjStorageTestFixture, unittest.TestCase):
     compression = "none"
+    slicing = ""
 
     def setUp(self):
         super().setUp()
         self.url = "http://127.0.0.1/test"
-        self.storage = WeedObjStorage(url=self.url, compression=self.compression)
-        self.storage.wf = MockWeedFiler(self.url)
+        self.storage = WeedObjStorage(
+            url=self.url, compression=self.compression, slicing=self.slicing
+        )
+        self.mock = FilerRequestsMock()
 
     def test_compression(self):
         content, obj_id = self.hash_content(b"test compression")
@@ -63,7 +231,7 @@
         self.storage.add(content, obj_id=obj_id)
 
         path = self.storage._path(obj_id)
-        self.storage.wf.content[path] += b"trailing garbage"
+        self.mock.content[path] += b"trailing garbage"
 
         if self.compression == "none":
             with self.assertRaises(Error) as e:
@@ -73,6 +241,13 @@
                 self.storage.get(obj_id)
             assert "trailing data" in e.exception.args[0]
 
+    def test_slicing(self):
+        content, obj_id = self.hash_content(b"test compression")
+        self.storage.add(content, obj_id=obj_id)
+
+        slicer = PathSlicer("/test", self.slicing)
+        assert slicer.get_path(obj_id.hex()) in self.mock.content
+
 
 class TestWeedObjStorageBz2(TestWeedObjStorage):
     compression = "bz2"
@@ -88,3 +263,15 @@
 
 class TestWeedObjStorageZlib(TestWeedObjStorage):
     compression = "zlib"
+
+
+class TestWeedObjStorageWithSlicing(TestWeedObjStorage):
+    slicing = "0:2/2:4"
+
+
+class TestWeedObjStorageWithSlicingAndSmallBatch(TestWeedObjStorage):
+    slicing = "0:2/2:4"
+
+    def setUp(self):
+        super().setUp()
+        self.storage.wf.batchsize = 1