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Operating Systems Linux Red Hat Read speed too bad on NAS share on VM Post 302923728 by ygemici on Tuesday 4th of November 2014 08:51:44 AM
Old 11-04-2014
if your mount options *(tcp/udp-rsize/wsize-nfs/cifs and vers and the other opt) and nic settings are same on the both of them server
then we may check the rx/tx (eg.number of packets which hold by driver) buffer queue sizes.because of there is seem drops in the rx buffer.

if any operations needs high traffic we can increase the driver buffers.
we are facing the slow read operations so you likely pointed the correct value.Smilie

check the your (vm) nic card driver and search for , is there a bug or update or patches and then apply it.
Code:
# ethtool -i eth0

check the current ring buffer settings.
Code:
# ethtool -g eth0

and try to increase the rx value to defined maximum values.(eg..256/512/1024)
Code:
# ethtool -G eth0 rx 512

and test again and check the drops count.

if there is no change after dd tests then you can try to change the virtual nic to avaliable other one in the oracle vm net settings.

good lucks
regards
ygemici
 

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aoe-interfaces(8)					      System Manager's Manual						 aoe-interfaces(8)

NAME
aoe-interfaces - restrict aoe driver to specified network interfaces SYNOPSIS
aoe-interfaces [dev1] [dev2 ...] aoe-interfaces -c DESCRIPTION
The aoe-interfaces command tells the aoe driver to ignore ATA over Ethernet (AoE) traffic on all but the specified network interfaces. It is analogous to the aoe_iflist module load option. If neither the aoe_iflist module load option nor the aoe-interfaces command are used, the aoe driver will use any network interface for AoE traffic. Using aoe-interfaces to limit AoE to only trusted networks prevents the case where a rogue AoE target appears on a public net- work, diverting data from the legitimate AoE target. Such an imposter target effectively corrupts the data on the legitimate target. If the aoe driver is a module, then calling aoe-interfaces without arguments will display the current interfaces list. If it hasn't been set then the output will be blank. It's good to run the aoe-discover command after setting the AoE interfaces list. OPTIONS
-c The -c flag will clear the interface access list, permitting any interface to be used. EXAMPLE
In this example, the root user on a host named nai loads the aoe module with only eth0 allowable for AoE traffic. After remembering that shelf 7 is on eth3, this sysadmin uses aoe-interfaces to add eth3 to the list of allowable network interfaces and then calls aoe-discover to ask the aoe driver to look for new AoE devices. nai:~# modprobe aoe aoe_iflist="eth0" nai:~# aoe-stat e10.9 eth0 up nai:~# aoe-interfaces eth0 eth3 nai:~# aoe-discover nai:~# aoe-stat e7.0 eth3 up e7.1 eth3 up e7.2 eth3 up e7.3 eth3 up e7.4 eth3 up e7.5 eth3 up e7.6 eth3 up e7.7 eth3 up e7.8 eth3 up e7.9 eth3 up e10.9 eth0 up nai:~# aoe-interfaces eth0 eth3 SEE ALSO
aoe-discover(8), aoe-stat(8), aoetools(8). AUTHOR
Ed L. Cashin (ecashin@coraid.com) aoe-interfaces(8)
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