Become a fan of Slashdot on Facebook

 



Forgot your password?
typodupeerror

Slashdot videos: Now with more Slashdot!

  • View

  • Discuss

  • Share

We've improved Slashdot's video section; now you can view our video interviews, product close-ups and site visits with all the usual Slashdot options to comment, share, etc. No more walled garden! It's a work in progress -- we hope you'll check it out (Learn more about the recent updates).

×

Comment: Sun Type 6 USB (Score 1) 452

by psergiu (#49275999) Attached to: Ask Slashdot: Good Keyboard?

If you are using a UNIX Operating system, you need to use a UNIX Keyboard: Sun Type 6 USB.
It has the right curvature (i.e. seen from the side, the keyboard is concave, not flat) so you can easily press the F-keys without lifting your wrists = no wrist pains.
It has Meta & Compose keys.
And it has the extra X11 keys on the left - that you can xmodmap to your liking.

If you use a keyboard with a Windows key sitting between Ctrl & Alt, you are NOT a True UNIX Sysadmin.

Good luck finding one :)

Comment: Re:Hardware connected to the GPIO pins (Score 1) 68

by psergiu (#49270865) Attached to: GCHQ Builds a Raspberry Pi Super Computer Cluster

After a bit of Google Image Search i think i found out the answer:

Those are Xtronix PoE adapters and are used to power the RPis
Notice how each RPi without this card is connected using a MicroUSB to MicroUSB cable to a nearby RPi who does have this card.
That's stupid and wasteful:
1) They are using a big honking switch with PoE in the back - those are expensive.
2) Powering the next RPi using USB backfeed going over two fuses will ensure that that second RPi gets undervolted and will be very unstable. They could at leas bridge the 5V GPIO pins between the RPIs, not use USB Backfeed.

Comment: Hardware connected to the GPIO pins (Score 1) 68

by psergiu (#49270755) Attached to: GCHQ Builds a Raspberry Pi Super Computer Cluster

The article doesn't have any details about the extra hardware that's connected to the RPi boards.

From the low-res picture, you can see that in each 8-RPi unit, all Pis have a "PiGlow" connected and 4 of the 8 Pis have an extra network card (or another device with a RJ54 cable) plugged in the GPIO slot (with a pass-trough for the PiGlow)

Anyone knows what device is that ?

Comment: Re:How systemd became Debian's default init system (Score 2) 550

How about using /etc/inittab to monitor & restart your daemons like all good Unix admins are doing since last century ?
Oh ... you only know about RedHat's netutered inittab ? Too bad. Let's all switch to systemd because AC is too lazy to read a man page.

(Bitter because i just had to reinstall a Jessie machine from scratch after a filesystem corruption borked 2 system-d config files - the system would not come up even in rescue mode as systemd was spewing 2 pages of errors on the console then hanging)

Comment: Re:Nice and all (Score 2) 107

by psergiu (#48351601) Attached to: Eben Upton Explains the Raspberry Pi Model A+'s Redesign

There are _NO_ 1Gb DDR1 chips in that form factor.
If you can manage to persuade any memory factory to build a couple of million of them at a price simmilar to the existing 512Mb ones - the whole world will be thanful.
All the 1Gb chips on the market now are DDR2 or faster - incompatible with RPi.
Eben Upton & the Foundation has tried and failed - nobody wants to make so few 1Gb DDR1 chips for so cheap.

Have you ever noticed that the people who are always trying to tell you `there's a time for work and a time for play' never find the time for play?

Working...