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pingcap · Dec 20, 2024 · 1101a93 · 1101a93
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diff --git a/hardware-and-software-requirements.md b/hardware-and-software-requirements.md
@@ -60,10 +60,10 @@ In v8.5 LTS, TiDB ensures multi-level quality standards for various combinations
     </tbody>
     </table>
 
-    > **Note:**
+    > **Warning:**
     >
-    > - According to [CentOS Linux EOL](https://blog.centos.org/2023/04/end-dates-are-coming-for-centos-stream-8-and-centos-linux-7/), the upstream support for CentOS Linux 7 ends on June 30, 2024. TiDB ends the support for CentOS 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version.
-    > - According to [Red Hat Enterprise Linux Life Cycle](https://access.redhat.com/support/policy/updates/errata/#Life_Cycle_Dates), the maintenance support for Red Hat Enterprise Linux 7 ends on June 30, 2024. TiDB ends the support for Red Hat Enterprise Linux 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version.
+    > - According to [CentOS Linux EOL](https://blog.centos.org/2023/04/end-dates-are-coming-for-centos-stream-8-and-centos-linux-7/), the upstream support for CentOS Linux 7 ends on June 30, 2024. TiDB ends the support for CentOS 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. Upgrading a TiDB cluster on CentOS 7 to v8.4.0 or later will cause the cluster to become unavailable. Before upgrading TiDB, make sure to check your operating system version.
+    > - According to [Red Hat Enterprise Linux Life Cycle](https://access.redhat.com/support/policy/updates/errata/#Life_Cycle_Dates), the maintenance support for Red Hat Enterprise Linux 7 ends on June 30, 2024. TiDB ends the support for Red Hat Enterprise Linux 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. Upgrading a TiDB cluster on Red Hat Enterprise Linux 7 to v8.4.0 or later will cause the cluster to become unavailable. Before upgrading TiDB, make sure to check your operating system version.
 
 + For the following combinations of operating systems and CPU architectures, you can compile, build, and deploy TiDB. In addition, you can also use the basic features of OLTP, OLAP, and the data tools. However, TiDB **does not guarantee enterprise-level production quality**:
 

diff --git a/releases/release-8.4.0.md b/releases/release-8.4.0.md
@@ -338,10 +338,10 @@ Starting from v8.4.0, the following contents are removed from the `TiDB-communit
 
 ## Operating system and platform requirement changes
 
-- According to [CentOS Linux EOL](https://www.centos.org/centos-linux-eol/), the upstream support for CentOS Linux 7 ends on June 30, 2024. TiDB ends the support for CentOS 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version.
-- According to [Red Hat Enterprise Linux Life Cycle](https://access.redhat.com/support/policy/updates/errata/#Life_Cycle_Dates), the maintenance support for Red Hat Enterprise Linux 7 ends on June 30, 2024. TiDB ends the support for Red Hat Enterprise Linux 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version.
+Before upgrading TiDB, make sure your operating system version meets the [OS and platform requirements](/hardware-and-software-requirements.md#os-and-platform-requirements).
 
-For the supported operating systems and platforms, see [Software and hardware recommendations](/hardware-and-software-requirements.md#os-and-platform-requirements).
+- According to [CentOS Linux EOL](https://www.centos.org/centos-linux-eol/), the upstream support for CentOS Linux 7 ends on June 30, 2024. TiDB ends the support for CentOS 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. Upgrading a TiDB cluster on CentOS 7 to v8.4.0 or later will cause the cluster to become unavailable.
+- According to [Red Hat Enterprise Linux Life Cycle](https://access.redhat.com/support/policy/updates/errata/#Life_Cycle_Dates), the maintenance support for Red Hat Enterprise Linux 7 ends on June 30, 2024. TiDB ends the support for Red Hat Enterprise Linux 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. Upgrading a TiDB cluster on Red Hat Enterprise Linux 7 to v8.4.0 or later will cause the cluster to become unavailable.
 
 ## Removed features
 

diff --git a/releases/release-8.5.0.md b/releases/release-8.5.0.md
@@ -239,6 +239,13 @@ Compared with the previous LTS 8.1.0, 8.5.0 includes new features, improvements,
 | PD | [`patrol-region-worker-count`](/pd-configuration-file.md#patrol-region-worker-count-new-in-v850) | Newly added | Controls the number of concurrent [operators](/glossary.md#operator) created by the checker when inspecting the health state of a Region. |
 | BR | [`--checksum`](/br/br-snapshot-manual.md) | Modified | Changes the default value from `true` to `false`, meaning that BR does not calculate the table-level checksum during full backups by default, to improve backup performance. |
 
+## Operating system and platform requirement changes
+
+Before upgrading TiDB, make sure your operating system version meets the [OS and platform requirements](/hardware-and-software-requirements.md#os-and-platform-requirements).
+
+- According to [CentOS Linux EOL](https://www.centos.org/centos-linux-eol/), the upstream support for CentOS Linux 7 ends on June 30, 2024. TiDB ends the support for CentOS 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. Upgrading a TiDB cluster on CentOS 7 to v8.4.0 or later will cause the cluster to become unavailable.
+- According to [Red Hat Enterprise Linux Life Cycle](https://access.redhat.com/support/policy/updates/errata/#Life_Cycle_Dates), the maintenance support for Red Hat Enterprise Linux 7 ends on June 30, 2024. TiDB ends the support for Red Hat Enterprise Linux 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. Upgrading a TiDB cluster on Red Hat Enterprise Linux 7 to v8.4.0 or later will cause the cluster to become unavailable.
+
 ## Removed features
 
 * The following feature has been removed:

diff --git a/upgrade-tidb-using-tiup.md b/upgrade-tidb-using-tiup.md
@@ -9,11 +9,12 @@ This document applies to upgrading to TiDB v8.5.0 from the following versions: v
 
 > **Warning:**
 >
-> 1. You cannot upgrade TiFlash online from versions earlier than 5.3 to 5.3 or later. Instead, you must first stop all the TiFlash instances of the early version, and then upgrade the cluster offline. If other components (such as TiDB and TiKV) do not support an online upgrade, follow the instructions in warnings in [Online upgrade](#online-upgrade).
-> 2. **DO NOT** run DDL statements during the upgrade process. Otherwise, the issue of undefined behavior might occur.
-> 3. **DO NOT** upgrade a TiDB cluster when a DDL statement is being executed in the cluster (usually for the time-consuming DDL statements such as `ADD INDEX` and the column type changes). Before the upgrade, it is recommended to use the [`ADMIN SHOW DDL`](/sql-statements/sql-statement-admin-show-ddl.md) command to check whether the TiDB cluster has an ongoing DDL job. If the cluster has a DDL job, to upgrade the cluster, wait until the DDL execution is finished or use the [`ADMIN CANCEL DDL`](/sql-statements/sql-statement-admin-cancel-ddl.md) command to cancel the DDL job before you upgrade the cluster.
-> 4. If the TiDB version before upgrade is 7.1.0 or later, you can ignore the preceding warnings 2 and 3. For more information, see [limitations on using TiDB smooth upgrade](/smooth-upgrade-tidb.md#limitations).
-> 5. Be sure to read [limitations on user operations](/smooth-upgrade-tidb.md#limitations-on-user-operations) before upgrading your TiDB cluster using TiUP.
+> 1. Starting from v8.4.0, TiDB no longer supports CentOS 7 and Red Hat Enterprise Linux 7. It is recommended to use Rocky Linux 9.1 or later. Upgrading a TiDB cluster running on CentOS 7 or Red Hat Enterprise Linux 7 to v8.4.0 or later will cause the cluster to become unavailable. Before upgrading TiDB, ensure that your operating system version meets the [OS and platform requirements](/hardware-and-software-requirements.md#os-and-platform-requirements).
+> 2. You cannot upgrade TiFlash online from versions earlier than 5.3 to 5.3 or later. Instead, you must first stop all the TiFlash instances of the early version, and then upgrade the cluster offline. If other components (such as TiDB and TiKV) do not support an online upgrade, follow the instructions in warnings in [Online upgrade](#online-upgrade).
+> 3. **DO NOT** run DDL statements during the upgrade process. Otherwise, the issue of undefined behavior might occur.
+> 4. **DO NOT** upgrade a TiDB cluster when a DDL statement is being executed in the cluster (usually for the time-consuming DDL statements such as `ADD INDEX` and the column type changes). Before the upgrade, it is recommended to use the [`ADMIN SHOW DDL`](/sql-statements/sql-statement-admin-show-ddl.md) command to check whether the TiDB cluster has an ongoing DDL job. If the cluster has a DDL job, to upgrade the cluster, wait until the DDL execution is finished or use the [`ADMIN CANCEL DDL`](/sql-statements/sql-statement-admin-cancel-ddl.md) command to cancel the DDL job before you upgrade the cluster.
+> 5. If the TiDB version before upgrade is 7.1.0 or later, you can ignore the preceding warnings 3 and 4. For more information, see [limitations on using TiDB smooth upgrade](/smooth-upgrade-tidb.md#limitations).
+> 6. Be sure to read [limitations on user operations](/smooth-upgrade-tidb.md#limitations-on-user-operations) before upgrading your TiDB cluster using TiUP.
 
 > **Note:**
 >