date:20121017

Re: A puzzle with internet time and NIST time

2012-10-17 Thread Helmut Wollmersdorfer



Am 16.10.2012 um 15:48 schrieb Paul E Condon:



I think you are mistaken about the sync only once a day. The signals
giving the year month and day are given once a day, but the precise
time-tics are given throughout the day. My clock has an indication
when it is receiving the radio signal which goes out when I move to a
place where the signal is weak, or when I change the battery and it
has not yet locked-in on the rhythm of the signal. Then, for a time,
the hour,minute,and second are good, but the date is wrong. Then after
a while, the correct date and day-of-week appear. I think the date
signal is actually more frequent than once a day, but definitely less
frequent than once a second. This is also the way that it is claimed
to work in the marketing materials.


Maybe you have a better radio clock, but most the cheap ones (20 - 40  
EUR/USD) sync once a day, or on demand by reset.


The process is as follows:

1. The sender emits the signal as a pulse every second (low or high bit)
2. The bits sent in one minute (59, 60 or 61 seconds) form a full  
record containing date, time, daylight saving, leap year, leap seconds  
and other information
3. The antenna of your clock receives the signal and tries to get the  
complete information of a cycle. This can need many minutes if the  
signal is noisy. Or it can fail. Or it only works in the night because  
of 'noise'.
4. The clock tries to move the clockhands in the correct position, and/ 
or tries to set the displays for date, weekday, and second.


The last two radio clocks I threw away had problems with step 4. They  
synced after reset (I tried often and also changed batteries, cleaned  
the contacts etc.), but the clockhands stopped at wrong positions. And  
it always was the same offset.





The reason for my puzzlement is that the clock has always behaved in a
way consistent with the above --- for about twelve years starting when
I lived in California and continuing here in Colorado, where I now
live --- until recently when I noticed this 16sec offset.


Your wallclock is out of order.

If you want to know it for sure, you can build a receiver for the  
signal, connect it to your computer and configure it into ntpd. There  
is enough documentation and software available for free about this.  
The material for one receiver costs around 10-20 USD. In my best time  
I had two time-servers with 6 such receivers connected to the servers.  
They received the British, Swiss and German time signals.



I have no
knowledge of international time signals. I'm sure there is world-wide
coordination, or perhaps the word is harmonization.


Time is coordinated internationally since more than 100 years. Each  
country has its own metrologic institute coordinating the time with  
the central bureau AFAIK in Paris. You can read everything about it in  
the internet.


If and since when the US take part of this coordination--I don't know.  
The US do not like international agreements. Have the US signed the  
Human Rights, or the international Woman Rights?



Helmut Wollmersdorfer


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Re: Vaio Z RAID 0

2012-10-17 Thread Dan

On Sat, Oct 13, 2012 at 7:18 PM, Dan  wrote:
> Hi,
>
> I bought a Vaio Z. It has 2 hard drives of 128 and they are setup with
> a fake RAID 0 " Intel Rapid Storage Technology " . That makes a RAID 0
> of 256Gb.
>
> I have no experience with RAIDs and I am trying to install wheezy but
> also to keep windows.
>
> I would like to keep the windows system. I made some space and I am
> able to go through the installation process but when I try to
> partition the hard drive I get:
>
> Failed to create a file system
> The ext4 file system creation in partition #6 of RAID0 device #126 failed
>
> I created the partitions... but I also got that message. Any ideas? It
> seems that the installer was able to create the partitions but not to
> create the filesystem.
>
> I read in Julien Danjou's blog that the Intel Rapid Storage
> Technology's RAID does not work properly with Linux.
> http://julien.danjou.info/blog/2012/sony-vaio-SVZ13-linux
>
> I would like to keep windows, but Julien suggested to wipe the whole
> hard drive. Any suggestions?
>
> Thanks a lot,
> Dan

Hi again,

Any ideas why I couldn't install linux in this fakeRAID? " Intel Rapid
Storage Technology " .
I think it is possible to disable the fakeRAID in the Bios.  Probably
If I am not able to install linux with Windows using this fakeRAID. I
will just erase windows and install only Linux (Debian) using a
software RAID 0. I think that should be quite straightforward with the
Debian installer.

Thanks,
Dan


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the good news is that I can confirm that it is possibly to run Linux
on a VAIO SVZ13, using the original Intel-RAID0 and without destroying
the pre-installed Windows. The bad news is that the way I did it is
probably not easy to follow for everyone, and it might require some luck
(i.e. using the correct versions of everything, and in the right order).

Unfortunately I cannot give you precise advice, but maybe telling you
about my experiences installing Linux on this device will be of some help.
However, in my case I did not install Debian Wheezy but Xubuntu 12.04.
For this I had to use Ubuntu's "alternate installer", which I believe
behaves very similar to the Debian installer, although I guess there
are some differences.

But before running any installer, I actualled used a Linux-Live-CD (GRML
2012.05) to back up (using ntfsclone) and shrink (using ntfsresize)
the Windows partitions and to repartition (using fdisk -uc) the
Intel-RAID0. If I recall correctly, the original partitioning was:
p1 = recovery
p2 = Windows boot loader
p3 = Windows 7
p4 = hibernation
I deleted p1 and p4 and shrank p3. Later during the installation, I used
p1 for the Linux / filesystem, and the space gained from p3&p4 for /home.

I do not recall having any trouble creating the filesystems. But if
I had, I would have tried creating the filesystems manually via GRML,
and then telling the installer to simply use the existing filesystems
(which I believe is possible, but admittedely I'm not completely sure).

For me the biggest snag was installing GRUB to the MBR, which requires
giving the correct device name, i.e. /dev/mappers/isw_something or so.
But in the end it worked, and dual-booting between Windows and Linux works
fine so far. As such, I cannot confirm the statement from Julien's blog
that "this kind of RAID is not supported correctly by GRUB".

Another internet resource which might contain helpful hints is this
thread:
http://forum.notebookreview.com/sony/675057-ubuntu-linux-svz1311.html

Hope this helps and good luck,
Frank

P.S. this is the first time I use google-mail to reply to this list,
so if this ends up in the wrong place or breaking the thread, I apologize.

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