Comments for DavidHunt.ie

Comment on Epson R2880 Printer Head Cleaning by DenOC

DenOC — Sun, 21 Apr 2013 11:28:54 +0000

Excellent tip. I spotted that option this morning but did not use it! I ended up doing 4 manual nozzle cleans and nozzle checks. Never again!

Comment on Infiniband SRP target on Ubuntu from Win7 by alex

alex — Sat, 30 Mar 2013 09:07:15 +0000

seeing the above with your limits in pcie bus lanes and slot sizes. they’ve been doing it for years. that was one of the selling points of the older i7/i9 chipset x57? and the newer 2011 socket as they have much more lanes to play with so more than likely those 2/3 x16 slots are electrically that size.

Comment on Infiniband at Home (10Gb networking on the cheap) by John

John — Mon, 25 Mar 2013 21:22:05 +0000

Great blog post and explanation of use of Infiniband. We have recently launch a Mellanox community dedicated to this and would love your input. There are even some talk about this same set up you might find interesting.
http://community.mellanox.com/people/mblanke/blog/2013/03/20/infiniband-at-home

Comment on Infiniband IPoIB & SRP target setup on Ububtu 11.10 by Chris Dalrymple

Chris Dalrymple — Sun, 17 Mar 2013 23:52:33 +0000

Hi David,

Thanks for putting this info together. It’s been a real help to me. I’ve followed along for several days now, starting with fresh Ubuntu builds a number of times. I’ve got the infiniband up and going between a Windows 7 box and an Ubuntu 12.04.2 installation. The bump in the road I seem to be having comes when I try to set up the SRP target on the Ubuntu box. In an earlier step when I try to list the drivers:

scstadmin -list_driver

the driver list is empty. No mention of ib_srpt.

Later, when I attempt to add a target to a group:

scstadmin -add_group HOST01 -driver ib_srpt -target ib_srpt_target_0

I get the following message:

“No such driver exists.”

This message appears to be originating from the SCST code. I’ve spent days trying to get to the bottom of this.

Admittedly, I’m not a Linux pro. I spend the majority of my time working on code and not operating systems.

If you or anyone else might be in a position to shed a little light on what might be at the heart of the issue, I would be tremendously grateful.

Comment on Infiniband at Home (10Gb networking on the cheap) by 10 Gigabit Ethernet at Home

10 Gigabit Ethernet at Home — Sat, 16 Mar 2013 22:46:25 +0000

[...] Products are still relatively costly though. A cheaper alternative might be to use IP-over-InfiniBand. [...]

Comment on Infiniband IPoIB & SRP target setup on Ububtu 11.10 by TooMeeK

TooMeeK — Sun, 10 Mar 2013 19:16:56 +0000

By the way:
TMPFS filesystem is faster than RAMDISK, however it has no device file like ramdisk has. And after using it just dismount folder and mount again and fall memory is unleased!

Comment on Infiniband IPoIB & SRP target setup on Ububtu 11.10 by InfiniBand network.. | TooMeeK

InfiniBand network.. | TooMeeK — Sun, 10 Mar 2013 19:15:48 +0000

[...] 2013-03-10: David Hunt wrote some very insteresting posts regarding InfiniBand at home project: 1,2,3,4 and storage 5. You have to take a look This entry was posted in hardware, networking by [...]

Comment on Infiniband at Home (10Gb networking on the cheap) by daveh

daveh — Thu, 07 Mar 2013 08:58:12 +0000

A standard cable is used. The cards will auto-negoitate Rx and Tx lines. No need for a crossed cable or switch.

Comment on Infiniband at Home (10Gb networking on the cheap) by david.miao

david.miao — Thu, 07 Mar 2013 06:35:18 +0000

It is a good idea! But is a crossed cable needed between the two PCs?

Comment on Infiniband IPoIB & SRP target setup on Ububtu 11.10 by Mr. Rustam

Mr. Rustam — Wed, 06 Mar 2013 08:53:23 +0000

Hello David, I need your help.
OS is Ubuntu x64, kernel 3.0.0-12.
I edit the /etc/modules as you wrote in blog, then install opesm.
I add the ib0 configs to /etc/network/interfaces and then reboot, in bootlog i have “ib_qib: Unable to register ipathfs”, and the ib0 doesn’t creates.
However, lspci can see it – ‘Infinibnd:Mellanox Technologies MT26428 [ConnectX VPI PCIe 2.0 5GT/s - IB QDR / 10GigE] (rev b0)’

What i need to do?
Best regard, Rustam!
p.s. i use two servers (supermicro) with mellanox IB card(qdr), and IB switch.
When i power up server, IB switch, and connect the IB wires – the leds on IB cards don’t light on, is it good? And on the IB switch i have top led (warning) is switched on.