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From Paul Angus <>
Subject RE: Cloudstack SSVM and MTU 9000 / jumbo frames
Date Thu, 04 Aug 2016 14:44:19 GMT
Which version of CloudStack are you running Andrei? There was a time when the MTU setting was
applied to the wrong interface but I believe that it has been fixed now.

Kind regards,

Paul Angus

53 Chandos Place, Covent Garden, London  WC2N 4HSUK

-----Original Message-----
From: Andrei Mikhailovsky [] 
Sent: 04 August 2016 15:14
To: users <>
Subject: Cloudstack SSVM and MTU 9000 / jumbo frames


I am experiencing some issues with setting MTU to 9000 on the cloudstack ssvm. I've updated
the secstorage.vm.mtu.size option in ACS management server and restarted it. After that i've
deleted the SSVM and it has been successfully recreated. 

Looking at the network interface on the host server running the ssvm i can see that it has
indeed updated the MTU value for the storage network. However, when I am logging into the
ssvm server, the server's storage eth1 interface has the MTU set to 1500 and not 9000. Analysing
the traffic on the nfs server I can see that it is still using 1500 MTU when transferring
data over nfs. 

Has anyone successfully changed the MTU value from default to 9000 on the storage network?
Please let me know how you've done this? 

Many thanks 

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