Friday, February 18, 2011

PDFCreator as a Windows service

Here you can find a post that explains how to setup PDFCreator as a Windows service:

Combined with some other little tweaks it resolves the lack of printer drivers on windows 7 x64.

Wednesday, February 16, 2011

Setting Jumbo Frames in vSphere from esx console

#1. Login to the ESX host via SSH

#2. Add a vSwitch
esxcfg-vswitch -a vSwitch2

#3. Set the MTU valu for the new vSwitch
esxcfg-vswitch -m 9000 vSwitch2
#4. Add PortGroup
esxcfg-vswitch -A "iSCSI" vSwitch2

#5. Add VMKernel Int.
esxcfg-vmknic -a -i -n -m 9000 "iSCSI"

#6. Attach vmnics
esxcfg-vswitch -L vmnic3 vSwitch2
#esxcfg-vswitch -L vmnic8 vSwitch2

#7. Check if all is configured ok
esxcfg-vswitch -l #should show the vSwitch's MTU is now 9000.
esxcfg-nics -l #should show the MTU for the NICs linked to that vSwitch are now set to 9000 as well
esxcfg-vmknic -l #show VMkernel NICs and should be now set to 9000 as well.

#8. Ping SAN with a package size of 9000 to see if everything Works
vmkping -s 9000

PING ( 9000 data bytes
9008 bytes from icmp_seq=0 ttl=64 time=0.531 ms
9008 bytes from icmp_seq=1 ttl=64 time=0.452 ms
9008 bytes from icmp_seq=2 ttl=64 time=0.451 ms

Does Open-E support Jumbo Frames?

Here you can find how to enable jumbo frames on Open-e appliances:
Open-E supports the use of Jumbo Frames.

Use Jumbo Frames to improve performance by sending fewer frames across the network, saving CPU time and consuming less bandwidth.  The standard recommendation for the size is 9000. 

The stipulation to using Jumbo Frames is that your network hardware, which includes Ethernet cards, switches, and routers, all need to support Jumbo Frames.  Check the specs on your Ethernet card to make sure Jumbo Frames are supported.  An example of one that does support them would be the Intel Pro/1000 CT.  So then you need to check the manuals on your switches and routers to make sure they also support Jumbo Frames, or check their websites with your model.  You'll need to know what you need to do to set your switches and routers to use Jumbo Frames.  Once your hardware has been verified, then it's just a matter of setting Jumbo Frames in the Console Tools of your Open-E server.

Go to the Hardware Tools
Ctl - Alt - W

Select Tuning Options
Select Jumbo Frames Config

Select the interface you want to set and set the number to 9000.