On Monday 20 October 2014 12:47:44 Peter C. Wallace did opine
And Gene did reply:
> On Sun, 19 Oct 2014, C. SB wrote:
> > Date: Sun, 19 Oct 2014 19:35:15 +0200
> > From: C. SB <beltoi...@email.com>
> > Reply-To: "Enhanced Machine Controller (EMC)"
> > 
> >     <emc-users@lists.sourceforge.net>
> > 
> > To: emc-users@lists.sourceforge.net
> > Subject: Re: [Emc-users] Emc-users Digest, Vol 102, Issue 54
> > 
> >> sympathizing with their captors.  When I suggest how easy it'd be to
> >> swap hard drives and install LinuxCNC and use the same hardware,
> > 
> > I need to violently disagree with this. On my setup, swapping drives
> > has been pure hell. With lava and everything.
> > 
> > First HDD (80GB IDE) had a DMA bug that caused >10ms latency jitter.
> > 
> >  -> Unfixable because newer libata doesn't work with hdparm anymore !
> > 
> > Second HDD (4GB IDE): tried copying setup from first HDD, but got
> > 
> >  tangled in a mess of UUID mismatch and "root not found" errors.
> >  -> Had to reinstall from scratch.
> > 
> > Third HDD (2TB SATA), brand new, isn't detected by all 3.x linux
> > 
> >  kernels I've tried (thanks, libata). To add insult to injury, winXP
> >  detects it just fine.
> > 
> > So I'm back to HDD #2. I'm not going to try to see how much time I've
> > wasted on this. I'm not even done yet.
> > 
> > 
> > When I recommend linuxCNC (I do), I never, ever mention swapping
> > HDDs. What I do mention is:
> > - incredibly excellent docs compared to Mach
> > - very coherent config (.ini, .hal, .xml : one directory)
> > 
> > CSB
> 
> My experience with swapping drives is pretty much the opposite
> 
> I'm up to at least 12 motherboards/systems that I can swap one
> harddrive (a 64 GB SATA SSD drive) without issue (this is with
> Wheezy/RTAI and Preemt-RT)
> 
> I had similar luck with a 80G mechnical SATA HD and Ubuntu
> 10.04/12.04/14.04
> 
> I am working with a known good drives that are suitable size for
> linuxcnc if you use random old drives or bleeding edge drives, trouble
> should be expected

And I'm working with whatever is the commodity drive I can get, yet today 
at Staples, if I need to.  When I had my last 3 failures 1Tb went from 
pricy to commodity to off the shelf now as I believe they think the 4Tb 
drive is commodity today.  And yes, I expect to have trouble but mainly 
because the drives firmware turn out to be at least 3 revisions behind, I 
have had to goto the Seagate site and download the self booting cd that 
scans the drives and offer to update those that this version of the cd can 
update.  

Amazingly, and I sure don't recommend it, it even updated the drive I was 
booting from.  Other than they were all as much as 40 megabytes/second 
faster, they have not dropped a bit that gedit didn't screw up first.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>
US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS

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