diff --git a/config/datanode.example.toml b/config/datanode.example.toml
index 8376b76f6888..7793e148ac4c 100644
--- a/config/datanode.example.toml
+++ b/config/datanode.example.toml
@@ -105,6 +105,9 @@ global_write_buffer_reject_size = "2GB"
 sst_meta_cache_size = "128MB"
 # Cache size for vectors and arrow arrays (default 512MB). Setting it to 0 to disable the cache.
 vector_cache_size = "512MB"
+# Buffer size for SST writing.
+sst_write_buffer_size = "8MB"
+
 
 # Log options
 # [logging]
diff --git a/src/cmd/src/datanode.rs b/src/cmd/src/datanode.rs
index da2466497bbc..0be8b08c63f4 100644
--- a/src/cmd/src/datanode.rs
+++ b/src/cmd/src/datanode.rs
@@ -191,7 +191,6 @@ mod tests {
     use std::io::Write;
     use std::time::Duration;
 
-    use common_base::readable_size::ReadableSize;
     use common_test_util::temp_dir::create_named_temp_file;
     use datanode::config::{CompactionConfig, FileConfig, ObjectStoreConfig, RegionManifestConfig};
     use servers::heartbeat_options::HeartbeatOptions;
@@ -300,7 +299,6 @@ mod tests {
                 max_inflight_tasks: 3,
                 max_files_in_level0: 7,
                 max_purge_tasks: 32,
-                sst_write_buffer_size: ReadableSize::mb(8),
             },
             options.storage.compaction,
         );
diff --git a/src/datanode/src/config.rs b/src/datanode/src/config.rs
index 5730ce9c85af..739d451d95e8 100644
--- a/src/datanode/src/config.rs
+++ b/src/datanode/src/config.rs
@@ -250,8 +250,6 @@ pub struct CompactionConfig {
     pub max_files_in_level0: usize,
     /// Max task number for SST purge task after compaction.
     pub max_purge_tasks: usize,
-    /// Buffer threshold while writing SST files
-    pub sst_write_buffer_size: ReadableSize,
 }
 
 impl Default for CompactionConfig {
@@ -260,7 +258,6 @@ impl Default for CompactionConfig {
             max_inflight_tasks: 4,
             max_files_in_level0: 8,
             max_purge_tasks: 32,
-            sst_write_buffer_size: ReadableSize::mb(8),
         }
     }
 }
@@ -312,7 +309,6 @@ impl From<&DatanodeOptions> for StorageEngineConfig {
             manifest_gc_duration: value.storage.manifest.gc_duration,
             max_files_in_l0: value.storage.compaction.max_files_in_level0,
             max_purge_tasks: value.storage.compaction.max_purge_tasks,
-            sst_write_buffer_size: value.storage.compaction.sst_write_buffer_size,
             max_flush_tasks: value.storage.flush.max_flush_tasks,
             region_write_buffer_size: value.storage.flush.region_write_buffer_size,
             picker_schedule_interval: value.storage.flush.picker_schedule_interval,
diff --git a/src/mito2/src/compaction.rs b/src/mito2/src/compaction.rs
index a3c830005013..3f009b667e37 100644
--- a/src/mito2/src/compaction.rs
+++ b/src/mito2/src/compaction.rs
@@ -22,6 +22,7 @@ use std::collections::HashMap;
 use std::sync::Arc;
 use std::time::Instant;
 
+use common_base::readable_size::ReadableSize;
 use common_telemetry::{debug, error};
 pub use picker::CompactionPickerRef;
 use snafu::ResultExt;
@@ -30,6 +31,7 @@ use tokio::sync::mpsc::{self, Sender};
 
 use crate::access_layer::AccessLayerRef;
 use crate::compaction::twcs::TwcsPicker;
+use crate::config::MitoConfig;
 use crate::error::{
     CompactRegionSnafu, Error, RegionClosedSnafu, RegionDroppedSnafu, RegionTruncatedSnafu, Result,
 };
@@ -51,6 +53,8 @@ pub struct CompactionRequest {
     pub(crate) file_purger: FilePurgerRef,
     /// Start time of compaction task.
     pub(crate) start_time: Instant,
+    /// Buffering threshold while writing SST files.
+    pub(crate) sst_write_buffer_size: ReadableSize,
 }
 
 impl CompactionRequest {
@@ -103,6 +107,7 @@ impl CompactionScheduler {
         access_layer: &AccessLayerRef,
         file_purger: &FilePurgerRef,
         waiter: OptionOutputTx,
+        engine_config: Arc<MitoConfig>,
     ) -> Result<()> {
         if let Some(status) = self.region_status.get_mut(&region_id) {
             // Region is compacting. Add the waiter to pending list.
@@ -117,19 +122,27 @@ impl CompactionScheduler {
             access_layer.clone(),
             file_purger.clone(),
         );
-        let request = status.new_compaction_request(self.request_sender.clone(), waiter);
+        let request =
+            status.new_compaction_request(self.request_sender.clone(), waiter, engine_config);
         self.region_status.insert(region_id, status);
         self.schedule_compaction_request(request)
     }
 
     /// Notifies the scheduler that the compaction job is finished successfully.
-    pub(crate) fn on_compaction_finished(&mut self, region_id: RegionId) {
+    pub(crate) fn on_compaction_finished(
+        &mut self,
+        region_id: RegionId,
+        engine_config: Arc<MitoConfig>,
+    ) {
         let Some(status) = self.region_status.get_mut(&region_id) else {
             return;
         };
         // We should always try to compact the region until picker returns None.
-        let request =
-            status.new_compaction_request(self.request_sender.clone(), OptionOutputTx::none());
+        let request = status.new_compaction_request(
+            self.request_sender.clone(),
+            OptionOutputTx::none(),
+            engine_config,
+        );
         // Try to schedule next compaction task for this region.
         if let Err(e) = self.schedule_compaction_request(request) {
             error!(e; "Failed to schedule next compaction for region {}", region_id);
@@ -138,7 +151,7 @@ impl CompactionScheduler {
 
     /// Notifies the scheduler that the compaction job is failed.
     pub(crate) fn on_compaction_failed(&mut self, region_id: RegionId, err: Arc<Error>) {
-        error!(err; "Region {} failed to flush, cancel all pending tasks", region_id);
+        error!(err; "Region {} failed to compact, cancel all pending tasks", region_id);
         // Remove this region.
         let Some(status) = self.region_status.remove(&region_id) else {
             return;
@@ -236,7 +249,7 @@ impl PendingCompaction {
         }
     }
 
-    /// Send flush error to waiter.
+    /// Send compaction error to waiter.
     fn on_failure(&mut self, region_id: RegionId, err: Arc<Error>) {
         for waiter in self.waiters.drain(..) {
             waiter.send(Err(err.clone()).context(CompactRegionSnafu { region_id }));
@@ -300,6 +313,7 @@ impl CompactionStatus {
         &mut self,
         request_sender: Sender<WorkerRequest>,
         waiter: OptionOutputTx,
+        engine_config: Arc<MitoConfig>,
     ) -> CompactionRequest {
         let current_version = self.version_control.current().version;
         let start_time = Instant::now();
@@ -310,6 +324,7 @@ impl CompactionStatus {
             waiters: Vec::new(),
             file_purger: self.file_purger.clone(),
             start_time,
+            sst_write_buffer_size: engine_config.sst_write_buffer_size,
         };
 
         if let Some(pending) = self.pending_compaction.take() {
@@ -352,6 +367,7 @@ mod tests {
                 &env.access_layer,
                 &purger,
                 waiter,
+                Arc::new(MitoConfig::default()),
             )
             .unwrap();
         let output = output_rx.await.unwrap().unwrap();
@@ -369,6 +385,7 @@ mod tests {
                 &env.access_layer,
                 &purger,
                 waiter,
+                Arc::new(MitoConfig::default()),
             )
             .unwrap();
         let output = output_rx.await.unwrap().unwrap();
@@ -427,6 +444,7 @@ mod tests {
                 &env.access_layer,
                 &purger,
                 OptionOutputTx::none(),
+                Arc::new(MitoConfig::default()),
             )
             .unwrap();
         // Should schedule 1 compaction.
@@ -454,6 +472,7 @@ mod tests {
                 &env.access_layer,
                 &purger,
                 OptionOutputTx::none(),
+                Arc::new(MitoConfig::default()),
             )
             .unwrap();
         assert_eq!(1, scheduler.region_status.len());
@@ -466,7 +485,7 @@ mod tests {
             .is_some());
 
         // On compaction finished and schedule next compaction.
-        scheduler.on_compaction_finished(region_id);
+        scheduler.on_compaction_finished(region_id, Arc::new(MitoConfig::default()));
         assert_eq!(1, scheduler.region_status.len());
         assert_eq!(2, job_scheduler.num_jobs());
         // 5 files for next compaction.
@@ -484,6 +503,7 @@ mod tests {
                 &env.access_layer,
                 &purger,
                 OptionOutputTx::none(),
+                Arc::new(MitoConfig::default()),
             )
             .unwrap();
         assert_eq!(2, job_scheduler.num_jobs());
diff --git a/src/mito2/src/compaction/twcs.rs b/src/mito2/src/compaction/twcs.rs
index 92df30e92f8c..e3bae3acfb4a 100644
--- a/src/mito2/src/compaction/twcs.rs
+++ b/src/mito2/src/compaction/twcs.rs
@@ -120,6 +120,7 @@ impl Picker for TwcsPicker {
             waiters,
             file_purger,
             start_time,
+            sst_write_buffer_size,
         } = req;
 
         let region_metadata = current_version.metadata.clone();
@@ -167,7 +168,7 @@ impl Picker for TwcsPicker {
             sst_layer: access_layer,
             outputs,
             expired_ssts,
-            sst_write_buffer_size: ReadableSize::mb(4),
+            sst_write_buffer_size,
             compaction_time_window: Some(time_window_size),
             request_sender,
             waiters,
@@ -355,7 +356,7 @@ impl CompactionTask for TwcsCompactionTask {
             Ok((added, deleted)) => {
                 info!(
                     "Compacted SST files, input: {:?}, output: {:?}, window: {:?}",
-                    added, deleted, self.compaction_time_window
+                    deleted, added, self.compaction_time_window
                 );
 
                 BackgroundNotify::CompactionFinished(CompactionFinished {
diff --git a/src/mito2/src/config.rs b/src/mito2/src/config.rs
index 09b33a886bde..5350c2c8e1a0 100644
--- a/src/mito2/src/config.rs
+++ b/src/mito2/src/config.rs
@@ -26,6 +26,8 @@ const DEFAULT_NUM_WORKERS: usize = 1;
 /// Default max running background job.
 const DEFAULT_MAX_BG_JOB: usize = 4;
 
+const MULTIPART_UPLOAD_MINIMUM_SIZE: ReadableSize = ReadableSize::mb(5);
+
 /// Configuration for [MitoEngine](crate::engine::MitoEngine).
 #[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq)]
 #[serde(default)]
@@ -63,6 +65,8 @@ pub struct MitoConfig {
     pub sst_meta_cache_size: ReadableSize,
     /// Cache size for vectors and arrow arrays (default 512MB). Setting it to 0 to disable the cache.
     pub vector_cache_size: ReadableSize,
+    /// Buffer size for SST writing.
+    pub sst_write_buffer_size: ReadableSize,
 }
 
 impl Default for MitoConfig {
@@ -79,6 +83,7 @@ impl Default for MitoConfig {
             global_write_buffer_reject_size: ReadableSize::gb(2),
             sst_meta_cache_size: ReadableSize::mb(128),
             vector_cache_size: ReadableSize::mb(512),
+            sst_write_buffer_size: ReadableSize::mb(8),
         }
     }
 }
@@ -117,5 +122,13 @@ impl MitoConfig {
                 self.global_write_buffer_reject_size
             );
         }
+
+        if self.sst_write_buffer_size < MULTIPART_UPLOAD_MINIMUM_SIZE {
+            self.sst_write_buffer_size = MULTIPART_UPLOAD_MINIMUM_SIZE;
+            warn!(
+                "Sanitize sst write buffer size to {}",
+                self.sst_write_buffer_size
+            );
+        }
     }
 }
diff --git a/src/mito2/src/flush.rs b/src/mito2/src/flush.rs
index 8bbbc6c94c54..504123bfd9a1 100644
--- a/src/mito2/src/flush.rs
+++ b/src/mito2/src/flush.rs
@@ -26,6 +26,7 @@ use strum::IntoStaticStr;
 use tokio::sync::mpsc;
 
 use crate::access_layer::AccessLayerRef;
+use crate::config::MitoConfig;
 use crate::error::{
     Error, FlushRegionSnafu, RegionClosedSnafu, RegionDroppedSnafu, RegionTruncatedSnafu, Result,
 };
@@ -198,6 +199,7 @@ pub(crate) struct RegionFlushTask {
     pub(crate) memtable_builder: MemtableBuilderRef,
     pub(crate) file_purger: FilePurgerRef,
     pub(crate) listener: WorkerListener,
+    pub(crate) engine_config: Arc<MitoConfig>,
     pub(crate) row_group_size: Option<usize>,
 }
 
@@ -289,8 +291,10 @@ impl RegionFlushTask {
             .with_label_values(&["flush_memtables"])
             .start_timer();
 
-        // TODO(yingwen): Make it configurable.
-        let mut write_opts = WriteOptions::default();
+        let mut write_opts = WriteOptions {
+            write_buffer_size: self.engine_config.sst_write_buffer_size,
+            ..Default::default()
+        };
         if let Some(row_group_size) = self.row_group_size {
             write_opts.row_group_size = row_group_size;
         }
@@ -723,6 +727,7 @@ mod tests {
             memtable_builder: builder.memtable_builder(),
             file_purger: builder.file_purger(),
             listener: WorkerListener::default(),
+            engine_config: Arc::new(MitoConfig::default()),
             row_group_size: None,
         };
         task.push_sender(OptionOutputTx::from(output_tx));
diff --git a/src/mito2/src/worker/handle_alter.rs b/src/mito2/src/worker/handle_alter.rs
index 0231217efb0d..693235e90f9f 100644
--- a/src/mito2/src/worker/handle_alter.rs
+++ b/src/mito2/src/worker/handle_alter.rs
@@ -80,7 +80,7 @@ impl<S> RegionWorkerLoop<S> {
             info!("Flush region: {} before alteration", region_id);
 
             // Try to submit a flush task.
-            let task = self.new_flush_task(&region, FlushReason::Alter, None);
+            let task = self.new_flush_task(&region, FlushReason::Alter, None, self.config.clone());
             if let Err(e) =
                 self.flush_scheduler
                     .schedule_flush(region.region_id, &region.version_control, task)
diff --git a/src/mito2/src/worker/handle_compaction.rs b/src/mito2/src/worker/handle_compaction.rs
index 58fd714c30d6..c00eaa865417 100644
--- a/src/mito2/src/worker/handle_compaction.rs
+++ b/src/mito2/src/worker/handle_compaction.rs
@@ -38,6 +38,7 @@ impl<S: LogStore> RegionWorkerLoop<S> {
             &region.access_layer,
             &region.file_purger,
             sender,
+            self.config.clone(),
         ) {
             error!(e; "Failed to schedule compaction task for region: {}", region_id);
         } else {
@@ -86,8 +87,10 @@ impl<S: LogStore> RegionWorkerLoop<S> {
         }
         // compaction finished.
         request.on_success();
+
         // Schedule next compaction if necessary.
-        self.compaction_scheduler.on_compaction_finished(region_id);
+        self.compaction_scheduler
+            .on_compaction_finished(region_id, self.config.clone());
     }
 
     /// When compaction fails, we simply log the error.
diff --git a/src/mito2/src/worker/handle_flush.rs b/src/mito2/src/worker/handle_flush.rs
index 24ffce1ce21c..8585adf31fae 100644
--- a/src/mito2/src/worker/handle_flush.rs
+++ b/src/mito2/src/worker/handle_flush.rs
@@ -14,12 +14,15 @@
 
 //! Handling flush related requests.
 
+use std::sync::Arc;
+
 use common_telemetry::{error, info, warn};
 use common_time::util::current_time_millis;
 use store_api::logstore::LogStore;
 use store_api::region_request::RegionFlushRequest;
 use store_api::storage::RegionId;
 
+use crate::config::MitoConfig;
 use crate::error::{RegionTruncatedSnafu, Result};
 use crate::flush::{FlushReason, RegionFlushTask};
 use crate::manifest::action::{RegionEdit, RegionMetaAction, RegionMetaActionList};
@@ -39,7 +42,12 @@ impl<S> RegionWorkerLoop<S> {
             return;
         };
 
-        let mut task = self.new_flush_task(&region, FlushReason::Manual, request.row_group_size);
+        let mut task = self.new_flush_task(
+            &region,
+            FlushReason::Manual,
+            request.row_group_size,
+            self.config.clone(),
+        );
         task.push_sender(sender);
         if let Err(e) =
             self.flush_scheduler
@@ -94,7 +102,8 @@ impl<S> RegionWorkerLoop<S> {
 
             if region.last_flush_millis() < min_last_flush_time {
                 // If flush time of this region is earlier than `min_last_flush_time`, we can flush this region.
-                let task = self.new_flush_task(region, FlushReason::EngineFull, None);
+                let task =
+                    self.new_flush_task(region, FlushReason::EngineFull, None, self.config.clone());
                 self.flush_scheduler.schedule_flush(
                     region.region_id,
                     &region.version_control,
@@ -107,7 +116,8 @@ impl<S> RegionWorkerLoop<S> {
         // TODO(yingwen): Maybe flush more tables to reduce write buffer size.
         if let Some(region) = max_mem_region {
             if !self.flush_scheduler.is_flush_requested(region.region_id) {
-                let task = self.new_flush_task(region, FlushReason::EngineFull, None);
+                let task =
+                    self.new_flush_task(region, FlushReason::EngineFull, None, self.config.clone());
                 self.flush_scheduler.schedule_flush(
                     region.region_id,
                     &region.version_control,
@@ -125,6 +135,7 @@ impl<S> RegionWorkerLoop<S> {
         region: &MitoRegionRef,
         reason: FlushReason,
         row_group_size: Option<usize>,
+        engine_config: Arc<MitoConfig>,
     ) -> RegionFlushTask {
         // TODO(yingwen): metrics for flush requested.
         RegionFlushTask {
@@ -136,6 +147,7 @@ impl<S> RegionWorkerLoop<S> {
             memtable_builder: self.memtable_builder.clone(),
             file_purger: region.file_purger.clone(),
             listener: self.listener.clone(),
+            engine_config,
             row_group_size,
         }
     }
@@ -220,6 +232,7 @@ impl<S: LogStore> RegionWorkerLoop<S> {
             &region.access_layer,
             &region.file_purger,
             OptionOutputTx::none(),
+            self.config.clone(),
         ) {
             warn!(
                 "Failed to schedule compaction after flush, region: {}, err: {}",
diff --git a/src/storage/src/config.rs b/src/storage/src/config.rs
index 6fa4b84cfcfc..73d75dd24594 100644
--- a/src/storage/src/config.rs
+++ b/src/storage/src/config.rs
@@ -34,7 +34,6 @@ pub struct EngineConfig {
     pub manifest_gc_duration: Option<Duration>,
     pub max_files_in_l0: usize,
     pub max_purge_tasks: usize,
-    pub sst_write_buffer_size: ReadableSize,
     /// Max inflight flush tasks.
     pub max_flush_tasks: usize,
     /// Default write buffer size for a region.
@@ -59,7 +58,6 @@ impl Default for EngineConfig {
             manifest_gc_duration: Some(Duration::from_secs(30)),
             max_files_in_l0: 8,
             max_purge_tasks: 32,
-            sst_write_buffer_size: ReadableSize::mb(8),
             max_flush_tasks: DEFAULT_MAX_FLUSH_TASKS,
             region_write_buffer_size: DEFAULT_REGION_WRITE_BUFFER_SIZE,
             picker_schedule_interval: Duration::from_millis(
diff --git a/src/storage/src/flush.rs b/src/storage/src/flush.rs
index 44f60624721c..9aa82c4154e0 100644
--- a/src/storage/src/flush.rs
+++ b/src/storage/src/flush.rs
@@ -18,6 +18,7 @@ mod scheduler;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::Arc;
 
+use common_base::readable_size::ReadableSize;
 use common_telemetry::logging;
 pub use picker::{FlushPicker, PickerConfig};
 pub use scheduler::{
@@ -269,7 +270,7 @@ impl<S: LogStore> FlushJob<S> {
             let iter = m.iter(iter_ctx.clone())?;
             let sst_layer = self.sst_layer.clone();
             let write_options = WriteOptions {
-                sst_write_buffer_size: self.engine_config.sst_write_buffer_size,
+                sst_write_buffer_size: ReadableSize::mb(8), // deprecated usage
             };
             futures.push(async move {
                 Ok(sst_layer
diff --git a/src/storage/src/flush/scheduler.rs b/src/storage/src/flush/scheduler.rs
index a6fa575ce93b..8d03ed6af68e 100644
--- a/src/storage/src/flush/scheduler.rs
+++ b/src/storage/src/flush/scheduler.rs
@@ -16,6 +16,7 @@ use std::sync::Arc;
 use std::time::Duration;
 
 use async_trait::async_trait;
+use common_base::readable_size::ReadableSize;
 use common_runtime::{RepeatedTask, TaskFunction};
 use common_telemetry::logging;
 use snafu::{ensure, ResultExt};
@@ -147,7 +148,7 @@ impl<S: LogStore> From<&FlushRegionRequest<S>> for CompactionRequestImpl<S> {
             compaction_time_window: req.compaction_time_window,
             sender: None,
             picker: req.compaction_picker.clone(),
-            sst_write_buffer_size: req.engine_config.sst_write_buffer_size,
+            sst_write_buffer_size: ReadableSize::mb(8), // deprecated usage
             // compaction triggered by flush always reschedules
             reschedule_on_finish: true,
         }
diff --git a/src/storage/src/region/writer.rs b/src/storage/src/region/writer.rs
index edd2e4cc462f..a14ada258898 100644
--- a/src/storage/src/region/writer.rs
+++ b/src/storage/src/region/writer.rs
@@ -374,7 +374,7 @@ where
         let mut inner = self.inner.lock().await;
 
         ensure!(!inner.is_closed(), error::ClosedRegionSnafu);
-        let sst_write_buffer_size = inner.engine_config.sst_write_buffer_size;
+        let sst_write_buffer_size = ReadableSize::mb(8); // deprecated usage
 
         inner
             .manual_compact(
diff --git a/tests-integration/tests/http.rs b/tests-integration/tests/http.rs
index cb697a7661a2..e9af72ef9e70 100644
--- a/tests-integration/tests/http.rs
+++ b/tests-integration/tests/http.rs
@@ -706,7 +706,6 @@ type = "{}"
 max_inflight_tasks = 4
 max_files_in_level0 = 8
 max_purge_tasks = 32
-sst_write_buffer_size = "8MiB"
 
 [datanode.storage.manifest]
 checkpoint_margin = 10
@@ -733,6 +732,7 @@ global_write_buffer_size = "1GiB"
 global_write_buffer_reject_size = "2GiB"
 sst_meta_cache_size = "128MiB"
 vector_cache_size = "512MiB"
+sst_write_buffer_size = "8MiB"
 
 [[datanode.region_engine]]