diff --git a/pageserver/src/tenant/storage_layer/inmemory_layer.rs b/pageserver/src/tenant/storage_layer/inmemory_layer.rs
index 0bce261829..2cb1304f4b 100644
--- a/pageserver/src/tenant/storage_layer/inmemory_layer.rs
+++ b/pageserver/src/tenant/storage_layer/inmemory_layer.rs
@@ -14,7 +14,6 @@ use crate::tenant::PageReconstructError;
 use crate::virtual_file::owned_buffers_io::io_buf_ext::IoBufExt;
 use crate::{l0_flush, page_cache};
 use anyhow::{anyhow, Context, Result};
-use bytes::Bytes;
 use camino::Utf8PathBuf;
 use pageserver_api::key::CompactKey;
 use pageserver_api::keyspace::KeySpace;
@@ -811,7 +810,7 @@ impl InMemoryLayer {
             l0_flush::Inner::Direct { .. } => {
                 let file_contents = inner.file.load_to_io_buf(ctx).await?;
                 // TODO(yuchen): see ways to avoid this copy.
-                let file_contents = Bytes::copy_from_slice(&file_contents);
+                let file_contents = file_contents.freeze();
 
                 for (key, vec_map) in inner.index.iter() {
                     // Write all page versions
@@ -825,7 +824,7 @@ impl InMemoryLayer {
                             len,
                             will_init,
                         } = entry;
-                        let buf = Bytes::slice(&file_contents, pos as usize..(pos + len) as usize);
+                        let buf = file_contents.slice(pos as usize, (pos + len) as usize);
                         let (_buf, res) = delta_layer_writer
                             .put_value_bytes(
                                 Key::from_compact(*key),
diff --git a/pageserver/src/virtual_file.rs b/pageserver/src/virtual_file.rs
index 2d9f4218e7..1a0f96d0f5 100644
--- a/pageserver/src/virtual_file.rs
+++ b/pageserver/src/virtual_file.rs
@@ -18,6 +18,7 @@ use crate::page_cache::{PageWriteGuard, PAGE_SZ};
 use crate::tenant::TENANTS_SEGMENT_NAME;
 use camino::{Utf8Path, Utf8PathBuf};
 use once_cell::sync::OnceCell;
+use owned_buffers_io::aligned_buffer::buffer::AlignedBuffer;
 use owned_buffers_io::aligned_buffer::{AlignedBufferMut, AlignedSlice, ConstAlign};
 use owned_buffers_io::io_buf_aligned::IoBufAlignedMut;
 use owned_buffers_io::io_buf_ext::FullSlice;
@@ -1364,7 +1365,7 @@ pub(crate) const fn get_io_buffer_alignment() -> usize {
 }
 
 pub(crate) type IoBufferMut = AlignedBufferMut<ConstAlign<{ get_io_buffer_alignment() }>>;
-// pub(crate) type IoBuffer = AlignedBuffer<ConstAlign<{ get_io_buffer_alignment() }>>;
+pub(crate) type IoBuffer = AlignedBuffer<ConstAlign<{ get_io_buffer_alignment() }>>;
 pub(crate) type IoPageSlice<'a> =
     AlignedSlice<'a, PAGE_SZ, ConstAlign<{ get_io_buffer_alignment() }>>;
 
diff --git a/pageserver/src/virtual_file/owned_buffers_io/aligned_buffer/raw.rs b/pageserver/src/virtual_file/owned_buffers_io/aligned_buffer/raw.rs
index b979606424..d9ef8d72f5 100644
--- a/pageserver/src/virtual_file/owned_buffers_io/aligned_buffer/raw.rs
+++ b/pageserver/src/virtual_file/owned_buffers_io/aligned_buffer/raw.rs
@@ -13,6 +13,9 @@ struct AlignedBufferPtr(*mut u8);
 // SAFETY: We gurantees no one besides `IoBufferPtr` itself has the raw pointer.
 unsafe impl Send for AlignedBufferPtr {}
 
+// SAFETY: We gurantees no one besides `IoBufferPtr` itself has the raw pointer.
+unsafe impl Sync for AlignedBufferPtr {}
+
 /// An aligned buffer type used for I/O.
 #[derive(Debug)]
 pub struct RawAlignedBuffer<A: Alignment> {
diff --git a/pageserver/src/virtual_file/owned_buffers_io/io_buf_ext.rs b/pageserver/src/virtual_file/owned_buffers_io/io_buf_ext.rs
index cd1917b580..c3940cf6ce 100644
--- a/pageserver/src/virtual_file/owned_buffers_io/io_buf_ext.rs
+++ b/pageserver/src/virtual_file/owned_buffers_io/io_buf_ext.rs
@@ -1,6 +1,6 @@
 //! See [`FullSlice`].
 
-use crate::virtual_file::IoBufferMut;
+use crate::virtual_file::{IoBuffer, IoBufferMut};
 use bytes::{Bytes, BytesMut};
 use std::ops::{Deref, Range};
 use tokio_epoll_uring::{BoundedBuf, IoBuf, Slice};
@@ -78,3 +78,4 @@ impl_io_buf_ext!(Bytes);
 impl_io_buf_ext!(BytesMut);
 impl_io_buf_ext!(Vec<u8>);
 impl_io_buf_ext!(IoBufferMut);
+impl_io_buf_ext!(IoBuffer);