iscsi and jumbo frames

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proxvects

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Dec 27, 2009
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Hello there,
I have installed proxmox ve 1.4, it's working well.
I'm using two servers in my environment, one server is VM server, another one is a storage server with iscsi on it.

I have installed windows 2008 as first virtual machine, that vm is installed on iscsi partition. I want to add extra storage on windows 2008 server with iscsi later.

In order to improve disk performance I decided to increase MTU to 9000 in my network environment, I did it on storage server, giga switch and vm server (thanks to that post http://www.proxmox.com/forum/showthread.php?p=4737#poststop).
Everything has mtu 9000 until I'll start vm, the MTU on bridge interface vmbr0 suddenly changed from 9000 to 1500, ifconfig is failing if I want to change it back to 9000.

How can I keep/change MTU 9000 on iscsi interface?
Should I remove my eth0 from bridge group vmbr0?

Any hints will be appreciated.

Thanks, Serge.
 
Hi,
i'm a little bit confused aboud your config.
Is the win2008 a vm-guest on the proxmox-server? If so just add the iscsi-storage (huge size) to the proxmox-server, add a lvm on the storage, and then define disks (ide, or virtio) for the win2008-vm (and disk for other vms) on the lvm-storage.
For the vm the storage looks normal harddisks - so no iscsi or mtu-settings are needet.

The mtu-settings is done in /etc/network/interfaces (no vmbr because only the host need this nic)
Code: 
auto eth2
iface eth2 inet static
    address 192.168.2.12
    netmask 255.255.255.0
    mtu 9000

Udo
 
Thank your for your advice, this is exactly what I did now.
win2008 is a vm-guest on the proxmox-server, I wanted to use iscsi under windows, thought to get some sort of flexibility but eventually dropped that idea.

Thanks, Serge.
 
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