Category Archives: Cisco Boot Flash

UCS Blade unable to ping or connect to vCenter

Hi All,

I came across a strange issue where 2 blades was unable to ping I could get 2 ping and then Request time outs

Problem : 2 Servers( in the same chassis server 3,4 ) unable to ping their gateway. Ping drops are after 1-2 packets. We cannot ping/ssh to them from outside and they cannot be added to vCenter. Other blades in the same chassis are working ( 1,2)

Steps Taken :

  1. Confirmed that we do not have any IP conflicts
  2. Made sure that we do not use the same subnet anywhere else in the network
  3. Also checked and confirmed that the Mgmt(CIMC) subnet is different

ucs1

  1. Started a ping from inside a Host ( Server-3 ) to check if you are able to get to the gateway
  2. Checked vobd logs  to find if you can find any  entrie for duplicate ip/mac
  3. Checked the Mgmt Interface : vmk0
  4. It is connected to Port Group : Management Network  on VLAN ID, Check if we are  using the right vlan
  5. Found that the MAC Address of the vmk0 is same as vnic (vmnic0) : This is a known issue VMware KB article here. This is the vnic mac address of the service profile which is attached to the esx blade.
  6. Deleted and re-created the vmk0 interface
  7. Confirmed that the MAC Address has changed
  8. Started a continuous ping which work fine now
  9. Host can now be added to the vCenter

 

 

So let me go through of the process of how we found the duplicate mac address.

The vnic mac address was taken by vmknic  as you might know vmknic mad starts with 00:50:56 but in my case it was same as the mac address of vnic from the service profile. Read the rest of this entry

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Cisco UCS FlexFlash Configuration of Secure Digital (SD) Card

 Cisco UCS FlexFlash /SDCard Configuration for Booting Server Operating System.

As most of the Cisco UCS users might be aware that Cisco has now add a lot of improvements and new features on the latest upgrade 2.2(1e).

One of the feature which we have started using is Cisco FlexFlash which is an SD Card. Its fully support if you buy the SD  Card from Cisco and we can even do mirroring on the Flash cards for redundancy, we will be installing ESXi Server 5.5 on these blades after mirroring them.

So where and How to install the Secure Digital (SD) Card  ?

If the CISCO UCS B200 Blade is in the Chassis you will need to power it off and slide it out just half way through and you should find the SD Card slot on the left

 

cisco ucs sdcard slot

for more information on how about this can be found on the following link http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/hw/blade-servers/B200M3.html

As you might be aware that CISCO UCS blade is just as equal to a brick and all the configuration is done on the logical server called Service profile. you will need to create a new  / clone an existing Service profile template and modify with the below changes which I have shown below on this post.

You will have to create a boot policy with CD Drive (legacy ) and SD Card and Some time you may end up getting this error ‘ advanced boot or secure boot configuration cannot be applied to the specified server There are not enough resources overall ‘ if you see it follow my blog post.

I have to make you aware that if you want to use SD card with Mirroring or RAID 1 you have to create the following new policies and create a Boot policy as mentioned above.

1. Disk policy with Mirror and any configuration

Raid_policy

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.   We have to create two Scrub policy under policy ( you can call it any thing you want which makes you understand what configuration you have selected)

  1. Flex Flash Scrub
  2. No Scrub

So where will you find the Flex Flash Controller?

Click on the Left pan on Equipment and Select the Chassis then the Server, on the right you will find the below details

click on Inventory and select the last tab which is Storage on the Storage tab you will find FlexFlash Controller

Note: this FlexFlash is only support if you are running 2.2 (d1) firmware.

(more…)

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