Greater New Hampshire Linux User Group (USA)

Mark Komarinski | 1 Mar 2009 01:54

Re: Disk imaging for XP system

Chris wrote:
> Hello All
>
> I have an XP system which I want to migrate from a 250GB IDE drive to 
> a 500GB SATA drive, is there a live CD and package that would allow me 
> to do that, I have tried Norton Ghost (2003) but that can't see the 
> SATA drive, and I have also tried Powerquest partition magic image 
> center with no luck because that barfs on some directory entry.
>
> WIll dd or some other program do the job or will I have to try to find 
> some other package?
I did this on my wife's machine some time ago (thought it was IDE to 
IDE).  Try g4l which is a bootable CD or USB stick.  It should allow you 
to go disk-to-disk, then use gparted to expand the NTFS partition.  Once 
you reboot XP, it will go through and do a disk check and you'll be set.

-Mark

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Paul Lussier | 1 Mar 2009 01:54

Re: linux accounting software or cheap winxp

Bruce Dawson <jbd@...> writes:

> OK. I'll ask the obvious next question - where did this 'ledger' command
> come from?

Err, apt-get install ledger ?

Though I tend to compile from source.  It's a John Wiegley production,
so it should be available from his website, www.newartisans.com.

--

-- 
Seeya,
Paul

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Alan Johnson | 1 Mar 2009 02:42

Re: How many laptops to a wireless AP?

On Sat, Feb 28, 2009 at 11:14 AM, Stephen Ryan <stephen <at> sryanfamily.info> wrote:

I think this is the answer right here; wireless uses the same CSMA/CD
algorithm that Ethernet does, so using WiFi is just like using the old
unswitched hubs. Documents from a few years back talking about
unswitched hubs reference a 30-40% limit on utilization; collisions end
up limiting maximum performance to no more than that.

For 802.11b, the problem is some what worse than the old wired hub, but 11a/g uses a slightly smarter algorithm that dramatically reduces the windows of opportunity for collisions. The AP acts like a bad traffic cop and yells "clear to send" to ever one at once, at which point there is a chance for collision. If there is a collision, some one is picked as the winner and gets the next few time slices. After a bit, there is another free-for-all, and another winner is picked. This happens hundreds of times per second and is some times adjustable in the advanced wireless settings, but you probably never need to mess with it.

--
Alan Johnson
alan-RG0himJ8WuzQT0dZR+AlfA@public.gmane.org

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Ben Scott | 1 Mar 2009 02:52

Re: How many laptops to a wireless AP?

On Sat, Feb 28, 2009 at 11:14 AM, Stephen Ryan <stephen@...> wrote:
> I think this is the answer right here; wireless uses the same CSMA/CD
> algorithm that Ethernet does ....

  From what I've read, not quite: It's CSMA (Carrier Sense Multiple
Access) without the CD (Collision Detect).  Most 802.11 stuff can't
detect collisions, because a radio which is transmitting can't tell if
another radio is also transmitting on the same frequency at the same
time.  Like with walkie-talkies; when you're transmitting, the
receiver is disabled.  So collisions hurt even more because the
equipment can't even tell there's been one.

  I dunno about the stuff which uses multiple transceivers.

-- Ben

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Ben Scott | 1 Mar 2009 02:57

Re: How many laptops to a wireless AP?

On Sat, Feb 28, 2009 at 10:22 AM, Pam McLeod <pmcleod@...> wrote:
>  ... I have tried deploying a laptop cart of 18-22 laptops with Linksys units (this was 3 years
> ago), and it was a dismal failure.  ...
> ... At that point, we deployed a Cisco Aironet enterprise AP (they are up around $500)
> and it was very successful. ...

  I haven't done this myself, but I lurk on a few lists like
isp-wireless and nanog, and what others have said concurs with the
above: Quality of the equipment makes a huge difference.  The SOHO
stuff is designed for a handful of light users.  The commercial stuff
costs more but can cope with larger groups.

-- Ben

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Alan Johnson | 1 Mar 2009 03:04

Re: How many laptops to a wireless AP?

On Sat, Feb 28, 2009 at 8:52 PM, Ben Scott <dragonhawk <at> gmail.com> wrote:

On Sat, Feb 28, 2009 at 11:14 AM, Stephen Ryan <stephen-CM7caJWJ0zdAoK+PcpnP3Q@public.gmane.org> wrote:

> I think this is the answer right here; wireless uses the same CSMA/CD

> algorithm that Ethernet does ....

From what I've read, not quite: It's CSMA (Carrier Sense Multiple
Access) without the CD (Collision Detect). Most 802.11 stuff can't
detect collisions, because a radio which is transmitting can't tell if
another radio is also transmitting on the same frequency at the same
time. Like with walkie-talkies; when you're transmitting, the
receiver is disabled. So collisions hurt even more because the
equipment can't even tell there's been one.

I dunno about the stuff which uses multiple transceivers.

You just tweaked my memory, Ben. I avoided using specific abbreviations before because I was straining to remember, but you got me most of the way: 11b does CSMA/CA (collision avoidance), where they listen to see if any one is transmitting and then give it a shot if all seems clear, but have no idea if they hit anyone, leaving it to TCP (or some similar protcal up the stack) to take care of it. This becomes inefficient very quickly as load increases.

11a/g does CDish stuff as I descibed before where the AP knows when a collission occurred and lets the clients know with a little more information who gets to go next.

--
Alan Johnson
alan-RG0himJ8WuzQT0dZR+AlfA@public.gmane.org

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Ben Scott | 1 Mar 2009 03:16

Re: Launchpad to be free

On Sat, Feb 28, 2009 at 8:43 AM, Greg Rundlett
<greg_rundlett@...> wrote:
> Sourceforge's TOS basically "All your code are belong to
> us" (you grant them a proprietary license [1]).

  That's a bit much.  Now, their TOS are confusing, no doubt about it.
 But in addition what you're looking at, they also state "Except for
Feedback ... COMPANY claims no ownership or control over any Content.
You ... retain all intellectual property rights ...".  Certainly, at
*NO* point, do they claim proprietary rights (ownership).  Don't
believe everything you read on Wikipedia.  They also qualify some of
their licensing statements with "... on SourceForge.net".  It reads
like an overzealous lawyer trying to make sure they have the right to
actually do what they're trying to do, i.e., copy and distribute
content.

  Did you know that by posting content (like your message) to the
GNHLUG server, you granting anyone the right to publish, duplicate,
and/or redistribute your content?  We do that because otherwise
running this list might be considered copyright infringement.

http://wiki.gnhlug.org/twiki2/bin/view/Www/LegalNotice

-- Ben

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Alan Johnson | 1 Mar 2009 03:17

Re: How many laptops to a wireless AP?

On Sat, Feb 28, 2009 at 8:57 PM, Ben Scott <dragonhawk <at> gmail.com> wrote:

I haven't done this myself, but I lurk on a few lists like
isp-wireless and nanog, and what others have said concurs with the
above: Quality of the equipment makes a huge difference. The SOHO
stuff is designed for a handful of light users. The commercial stuff
costs more but can cope with larger groups.

This used to be very true in the 11b days as a few manufacturers, Cisco included, did the 11a/g style CSMA on 11b as a proprietary value-add. This was so successful that it became part of the 11a/g specs. Some vendors even developed some super sweet polling algorithms (no collisions as clients only speak when spoken too), the jists of which are part of the WiMAX standard.

But I digress. I'd stick to Bruce's link as a guide to modern LAN gear. If you want to talk WAN, which is what we isp-wireless folks are more concerned with, we have a whole other world of things to talk about. =) WiWAN in very breif: polling is king for point to multi point, but mesh works well with 11a/g(/n?) style CSMA/CD.

--
Alan Johnson
alan <at> datdec.com

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Tom Buskey | 1 Mar 2009 03:18

Re: Disk imaging for XP system

On Sat, Feb 28, 2009 at 7:54 PM, Mark Komarinski <mkomarinski-GqRSzq0LZOzYtjvyW6yDsg@public.gmane.org> wrote:

Chris wrote:
> Hello All
>
> I have an XP system which I want to migrate from a 250GB IDE drive to
> a 500GB SATA drive, is there a live CD and package that would allow me
> to do that, I have tried Norton Ghost (2003) but that can't see the
> SATA drive, and I have also tried Powerquest partition magic image
> center with no luck because that barfs on some directory entry.
>
> WIll dd or some other program do the job or will I have to try to find
> some other package?

I've played around with Clonezilla. It's a live CD that will image the used part of a Windows or Linux system to a fileserver (ftp/nfs/cifs/SSH host). If it doesn't know the filesystem, it will dd the whole disk. If you do that, you can't shrink the disk when you unimage.

They have additions that will multicast to image multiple systems like ghost can.

I did this on my wife's machine some time ago (thought it was IDE to
IDE). Try g4l which is a bootable CD or USB stick. It should allow you
to go disk-to-disk, then use gparted to expand the NTFS partition. Once
you reboot XP, it will go through and do a disk check and you'll be set.

I've heard of g4l as well.

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Ben Scott | 1 Mar 2009 03:21

Re: Disk imaging for XP system

On Sat, Feb 28, 2009 at 10:16 AM, Chris <fj1200@...> wrote:
> I have an XP system which I want to migrate from a 250GB IDE drive to a
> 500GB SATA drive, is there a live CD and package that would allow me to do
> that ...

  I've used the partimage tool to clone partitions, and parted with
the gparted GUI front-end to resize/move them, always with good
results so far.  Used it on partitions from Windows 2000 and XP.
Haven't tried Vista.  Both tools are included on the bootable
SysRescueCD (http://www.sysresccd.org/).

-- Ben

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