[202205] Fix issue: should use 'Value' column to calculate the health percentage for Virtium SSD (#385)

Backport commits:

07ccd27 Fix issue: should use 'Value' column to calculate the health percentage
6d2d7a3 [ssd_generic] Get health status from Remaining_Life_Left field for virtium SSD (#344)
feb5036 [SSD] deduce vendor name from part number (#322)

Description
Currently, we are using "Low Raw" column to calculate SSD health, but "Value"column should be used according to vendor document.

Motivation and Context
Fix issue that SSD health display wrong value

How Has This Been Tested?
Manual test
Unit test

Author: Junchao-Mellanox

sonic_platform_base/sonic_ssd/ssd_generic.py

@@ -52,10 +52,10 @@ def __init__(self, diskdev):
 
         # Known vendor part
         if self.model:
-            model_short = self.model.split()[0]
-            if model_short in self.vendor_ssd_utility:
-                self.fetch_vendor_ssd_info(diskdev, model_short)
-                self.parse_vendor_ssd_info(model_short)
+            vendor = self._parse_vendor()
+            if vendor:
+                self.fetch_vendor_ssd_info(diskdev, vendor)
+                self.parse_vendor_ssd_info(vendor)
             else:
                 # No handler registered for this disk model
                 pass
@@ -72,6 +72,15 @@ def _parse_re(self, pattern, buffer):
         res_list = re.findall(pattern, buffer)
         return res_list[0] if res_list else NOT_AVAILABLE
 
+    def _parse_vendor(self):
+        model_short = self.model.split()[0]
+        if model_short in self.vendor_ssd_utility:
+            return model_short
+        elif self.model.startswith('VSF'):
+            return 'Virtium'
+        else:
+            return None
+
     def fetch_generic_ssd_info(self, diskdev):
         self.ssd_info = self._execute_shell(self.vendor_ssd_utility["Generic"]["utility"].format(diskdev))
 
@@ -115,7 +124,7 @@ def parse_innodisk_info(self):
         if self.vendor_ssd_info:
             self.health = self._parse_re('Health:\s*(.+?)%', self.vendor_ssd_info)
             self.temperature = self._parse_re('Temperature\s*\[\s*(.+?)\]', self.vendor_ssd_info)
-        
+
         if self.health == NOT_AVAILABLE:
             health_raw = self.parse_id_number(INNODISK_HEALTH_ID)
             if health_raw == NOT_AVAILABLE:
@@ -134,10 +143,16 @@ def parse_virtium_info(self):
             self.temperature = self._parse_re('Temperature_Celsius\s*\d*\s*(\d+?)\s+', self.vendor_ssd_info)
             nand_endurance = self._parse_re('NAND_Endurance\s*\d*\s*(\d+?)\s+', self.vendor_ssd_info)
             avg_erase_count = self._parse_re('Average_Erase_Count\s*\d*\s*(\d+?)\s+', self.vendor_ssd_info)
-            try:
-                self.health = 100 - (float(avg_erase_count) * 100 / float(nand_endurance))
-            except (ValueError, ZeroDivisionError):
-                pass
+            if nand_endurance != NOT_AVAILABLE and avg_erase_count != NOT_AVAILABLE:
+                try:
+                    self.health = 100 - (float(avg_erase_count) * 100 / float(nand_endurance))
+                except (ValueError, ZeroDivisionError):
+                    pass
+            else:
+                try:
+                    self.health = float(self._parse_re('Remaining_Life_Left\s*\d*\s*\d*\s*(\d+?)\s+', self.vendor_ssd_info))
+                except ValueError:
+                    pass
 
     def fetch_vendor_ssd_info(self, diskdev, model):
         self.vendor_ssd_info = self._execute_shell(self.vendor_ssd_utility[model]["utility"].format(diskdev))