On Sun, 19 Oct 2014, C. SB wrote:

> Date: Sun, 19 Oct 2014 19:35:15 +0200
> From: C. SB <[email protected]>
> Reply-To: "Enhanced Machine Controller (EMC)"
>     <[email protected]>
> To: [email protected]
> 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




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Peter Wallace
Mesa Electronics

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