korrektur (keyboard corrupt)Re: ada0s1 freebsd 153 GB , ZFS installation attempt failed Memory test was performed more as 20 time's from linux 16.04 64 grub editor

[Valeri Galtsev]

On Tue, January 3, 2017 1:26 pm, swjatoslaw gerus wrote:
>  Memory test was performed more as 20 time's from linux 16.04 64  grub
>  editor
>
> no any error by memory  ...all good

Well, memory test (memtest86) runs as stand-alone process sort of. This
means, yes, it does test huge variety of bit patters, thus can rule out
regular things like dead bits, leads connected to each other (address or
data), or broken leads (bad contact), cross-talk between lines externally
on the box or internally inside chips etc. But unfortunately this doesn't
cover all possibilities of memory errors, some of them can be really
weird, and occur only when machine is under really heavy load. This last
can be triggered in marginal situations when memory is "almost failing",
i.e. signals are close to the limits yet still withing specs. Heavy load
can increase ripple on some memory bus leads (say, power leads), which may
trigger the above signals going out of specs (even if the ripple is still
is withing specs). And this real situation has no chance to be detected
running memtest86. Memtest86 runs at virtually zero load, so many factors
(hardware related) are favorable for passing memtest86 successfully.

I guess, what I'm trying to say: even if memtest86 is successful through
4+ loops, one can not fully rule out memory.

On the other hand, I realize not that this is long thread that here is
truncated to very short item....

Valeri

>
> --
>   swjatoslaw  gerus
>   milstar2 at eml.cc
>
> On Tue, Jan 3, 2017, at 07:38 PM, Bernt Hansson wrote:
>> On 2017-01-03 15:39, swjatoslaw gerus wrote:
>> > korrektur (keyboard corrupt)Re: ada0s1  freebsd 153  GB ,ZFS
>> > installation attempt failed
>> The best approach for you, as i see it, is to buy a new disk
>> and use that new disk for your freebsd install.
>
> --
> http://www.fastmail.com - Choose from over 50 domains or use your own
>
> _______________________________________________
> freebsd-questions at freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-questions
> To unsubscribe, send any mail to
> "freebsd-questions-unsubscribe at freebsd.org"
>


++++++++++++++++++++++++++++++++++++++++
Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247
++++++++++++++++++++++++++++++++++++++++