I recently have a task to review the DNS settings for more than 100 Windows servers in the same domain. I drafted a simple PowerShell script to perform the Windows DNS checking and export all the server DNS configuration into a CSV file.Continue reading
Category Archives: Unified Computing
Change Service Profile Template from initial to updating in Cisco UCS
In Cisco UCS system, one of the important configuration is service profile template type, choosing from “initial template” or “updating template”. Updating service profile template provide the ability to update the binded service profile when template itself is updated.
In some user cases, the service profile template is created as an “initial template” initially. But the user want to change it from “initial” to “updating” at a later stage. Unfortunately, there is no direct conversion option in UCS, this post is to provide an alternative way to achieve this.
Generate Customer Signed Certificate on Linux
This is a quick post to list the steps about generating the Customer Signed Certificate by using openssl on Linux platform (Take CentOS as an example).
The basic knowledge of CA can be referenced at below Wiki page:
Specify a custom level of Cipher Suite security for Cisco UCS Manager
This post is to provide an example about how to specify a custom level of Cipher Suite security for the Cisco UCS Manager. Cisco have provided a customer Cipher Suite Mode, which allows you to specify a user-defined Cipher Suite specification string.
Cisco UCS Manager Client CA signed Certificate (Step by Step)
This post is to provide the steps to replace the self-signed certificate of Cisco UCS Manager to the client signed CA certificate.
Cisco MDS Fabric Merge Failure Case
We had ran a MDS fabric merge recently between MDS9509 and MDS9148 and met below two errors during the merging process. These errors could be avoided by configuring the correct setting which is detailed as below:
- Domain ID Configuration
Error Message: %FCDOMAIN-2-EPORT_ISOLATED: %$VSAN 10%$ Isolation of interface port-channel10 (reason: configured domain ID is different from runtime domain ID)
From the log information, it is clear stated that the Domain ID is mis-matched between running-config and local switch configuration. One of the major reasons is the “fcdomain restart” command is not executed after setting the Domain ID. The “fcdomain restart” command basically applies your changes to the runtime settings and align the configured ID and running ID.
DELL Server Firmware Upgrade by Utilizing DELL Repository Manager
There are multiple ways to upgrade DELL Server firmware. However, frankly speaking, DELL server upgrade is not easy enough comparing with HP or Cisco Servers. HP provides SPP and Cisco provide HUU/firmware pack for UCS system, which consolidate and align all the driver/firmware to be at the same level to make the upgrade workflow easier. In general, the recommended DELL upgrade workflow and available methods are detailed in the below document.
In this post, we will utilize the DELL Repository Manager to upgrade the Dell Servers.
Cisco UCS Jumbo Frame Configuration – The CoS Value Matters
I recently participated a technical trouble shooting regarding UCS jumbo frame setting to support NetApp SolidFire iSCSI storage. When the UCS MTU value in QoS setting is changed to 9216, the connection between UCS and NetApp SolidFire is lost. However, the new UCS QoS setting could be supported by the NetApp FAS iSCSI system in the same environment. A diagram as below illustrates the situation.