SQL or other outage during Cluster Switch Upgrade

Applies to

• Cisco Nexus 3132 Cluster Switch
• Cisco Nexus 3232 Cluster Switch

Issue

• During an upgrade of a cluster switch for future expansion, an outage takes place because of loss of network connectivity.
• Example: A SQL error is seen in the Windows Event Viewer of the SQL server:

The IO operation at logical block address 0x2fa2da1 for Disk 0 (PDO name: \Device\00000030) was retried.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="disk" />
    <EventID Qualifiers="32772">153</EventID>
    <Level>3</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2021-03-03T06:27:12.317465000Z" />
    <EventRecordID>58122343</EventRecordID>
    <Channel>System</Channel>
    <Computer>sql1.company.com</Computer>
    <Security />
  </System>
  <EventData>
    <Data>\Device\Harddisk0\DR0</Data>
    <Data>0x2fa2da1</Data>
    <Data>0</Data>
    <Data>\Device\00000030</Data>
    <Binary>0F01040004002C0000000000990004800000000000000000000000000000000000000000000000000040022A</Binary>
  </EventData>
</Event>