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Field Notice 70545
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Sam Jones
Beginner

Impact of Acknowledge Chassis

I am working on understanding the impact of an acknowledge chassis process.  Documentation would be great of this process. 

Questions

Will traffic through the chassis stop?

Will I loose connection to the SAN for my VMs?

Will the blades in the chassis go through a reboot?

   If so will I be able to move VM's to a different blade during that process and not experience an outage for the VM's storage?

Will both Fabric Interconnects reboot?

   If so will they reboot at the same time or staggered?

How will this affect my VMware environment running on this Chassis?

 

Thanks for any information.

Sam

1 ACCEPTED SOLUTION

Accepted Solutions

answers inline wdey>>

Will traffic through the chassis stop?

wdey>> yes, for about 40+- seconds; most OS can tolerate this; however, as Steven mentions, it is best practise to take no risk and vmotion off the VM's from this chassis

Will I loose connection to the SAN for my VMs?

wdey>> yes, see above

Will the blades in the chassis go through a reboot?

wdey>> no !

   If so will I be able to move VM's to a different blade during that process and not experience an outage for the VM's storage?

wdey>> yes, to a different blade in another chassis

Will both Fabric Interconnects reboot?

wdey>> No

   If so will they reboot at the same time or staggered?

How will this affect my VMware environment running on this Chassis?

 

The question is: when is it necessary to ack the chassis ? in my opinion only in rare cases, eg. selecting port channel between IOM and FI !

View solution in original post

2 REPLIES 2
ssumichrast
Beginner

Acknowledging an existing working chassis will cause everything within the chassis and both IOM modules to restart. You will have no network or San traffic through the affected chassis during the acknowledge process. You should vmotion off all the blades operating in the chassis you want to acknowledge and then they won't be impacted.

 

I retract what I said earlier.  Acking a chassis won't reboot the blades but they will lose connectivity for 30-60 seconds.  Note that will include SAN traffic.  Plan accordingly.

answers inline wdey>>

Will traffic through the chassis stop?

wdey>> yes, for about 40+- seconds; most OS can tolerate this; however, as Steven mentions, it is best practise to take no risk and vmotion off the VM's from this chassis

Will I loose connection to the SAN for my VMs?

wdey>> yes, see above

Will the blades in the chassis go through a reboot?

wdey>> no !

   If so will I be able to move VM's to a different blade during that process and not experience an outage for the VM's storage?

wdey>> yes, to a different blade in another chassis

Will both Fabric Interconnects reboot?

wdey>> No

   If so will they reboot at the same time or staggered?

How will this affect my VMware environment running on this Chassis?

 

The question is: when is it necessary to ack the chassis ? in my opinion only in rare cases, eg. selecting port channel between IOM and FI !

View solution in original post

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