Improve performance for Dell force10 and OS10 devices

Defining a pattern is necessary to get good performance, otherwise Netmiko
falls back to a sleep-based mechanism (read_channel_timing) for many
common operations.

netmiko/dell/dell_force10_ssh.py

@@ -5,6 +5,24 @@ from netmiko.cisco_base_connection import CiscoSSHConnection
 class DellForce10SSH(CiscoSSHConnection):
     """Dell Force10 Driver - supports DNOS9."""
 
+    def session_preparation(self) -> None:
+        """Prepare the session after the connection has been established."""
+        self._test_channel_read(pattern=r"[>#]")
+        self.set_base_prompt()
+        self.set_terminal_width()
+        self.disable_paging()
+
+    def check_config_mode(
+        self,
+        check_string: str = ")#",
+        pattern: str = r"[>#]",
+        force_regex: bool = False,
+    ) -> bool:
+        """
+        Checks if the device is in configuration mode or not.
+        """
+        return super().check_config_mode(check_string=check_string, pattern=pattern)
+
     def save_config(
         self,
         cmd: str = "copy running-configuration startup-configuration",

netmiko/dell/dell_os10_ssh.py

@@ -10,6 +10,24 @@ import re
 class DellOS10SSH(CiscoSSHConnection):
     """Dell EMC Networking OS10 Driver - supports dellos10."""
 
+    def session_preparation(self) -> None:
+        """Prepare the session after the connection has been established."""
+        self._test_channel_read(pattern=r"[>#]")
+        self.set_base_prompt()
+        self.set_terminal_width()
+        self.disable_paging()
+
+    def check_config_mode(
+        self,
+        check_string: str = ")#",
+        pattern: str = r"[>#]",
+        force_regex: bool = False,
+    ) -> bool:
+        """
+        Checks if the device is in configuration mode or not.
+        """
+        return super().check_config_mode(check_string=check_string, pattern=pattern)
+
     def save_config(
         self,
         cmd: str = "copy running-configuration startup-configuration",