I have a KVM virtualization in Debian with 2 guests (Debian and Windows 2008). I want to have a 'mount point' shared that can be accessed by the 3 system (host and 2 guests) at the same time. So the only thing that I found was a NFS/SMB network storage. I picked NFS

Due to my Ethernet network (10/100), the speed average that I get between accessing/transfering files between the 3 system is always 8~10MB/s.

The point is if is there any chance of get a boost system for sharing files between 3 system (at the same time) without wasting the speed of my SATA disks. I mean, without the Ethernet limitation of 10 MB/s

auto eth0
iface eth0 inet manual

auto br0
iface br0 inet static
    address aaa.bbb.ccc.xxx (public ip1)
    network aaa.bbb.ccc.0
    broadcast aaa.bbb.ccc.255
    gateway aaa.bbb.ccc.254 (ISP gateway)
    bridge_ports eth0
    bridge_fd 9
    bridge_hello 2
    bridge_maxage 12
    bridge_stp off

eth0 is my physical interface, br0 the bridge and vnet+ the VM's interfaces

# brctl show
bridge name bridge id       STP enabled     interfaces
br0     8000.e840f20acc28   no                 eth0

vnet0 and vnet1 have two publics different ips. But they also use the same gateway (ISP gateway) of the host

  • 1
    So you have a single host with two guests and you want to share a filesystem between the host and two guests? Or do you have a separate file server for all three that's using the FE link? If it's on the same host are you bridging the three IP's into the same subnet or is the traffic being routed? – rnxrx Jun 30 '12 at 1:41
  • Exactly, it a single host with two guest. But it is not te same subnet, because each one have a public internet IP. It is a OVH server with various failover IP. Anyway, even the two guests like the host are connected to an OpenVPN, where the server host is also the OpenVPN host – blacksoul Jun 30 '12 at 7:10
  • I have just added brctl show – blacksoul Jun 30 '12 at 12:33

Something I haven't tried yet, but I think it might work - create a bridge on a dummy interface, and give the VM an interface on that network too. Should eliminate the old NIC from creating bottlenecks in the stack.

  • I guess with that I also will have the same issue that now, speed average of 10MB/s. Because they are not detecting that are 'the same HDD'. They pass all the 'transfers' via ethernet interfaces – blacksoul Jun 30 '12 at 12:28
  • Yes, NFS is a NETWORK File System after all. – dyasny Jul 1 '12 at 5:24
  • I already knew thar. I am asking if there any other solution to my scenario – blacksoul Jul 1 '12 at 7:31
  • I have already provided you with the available solutions. – dyasny Jul 1 '12 at 7:36
  • I already have the NFS solution, limited to the FastEthernet 10MB/s speed. But I figure out that there is any other possibility to improve that speed, I don't know if without or what, to not wasting my SATA HDD speed. They are only virtual machines, the HDD is the same – blacksoul Jul 1 '12 at 7:46

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