Date: Tue, 3 Jan 2017 16:10:07 -0600 (CST) From: "Valeri Galtsev" <galtsev@kicp.uchicago.edu> To: "swjatoslaw gerus" <milstar2@eml.cc> Cc: "Bernt Hansson" <bah@bananmonarki.se>, "Polytropon" <freebsd@edvax.de>, freebsd-questions@freebsd.org Subject: Re: 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 Message-ID: <52387.128.135.52.6.1483481407.squirrel@cosmo.uchicago.edu> In-Reply-To: <1483471616.861917.836258425.4D61262F@webmail.messagingengine.com> References: <1483234588.3953682.834028153.34EF2FB6@webmail.messagingengine.com> <20170101032236.58b18351.freebsd@edvax.de> <1483319958.407695.834613121.22D7AD34@webmail.messagingengine.com> <20170102022858.aa354bba.freebsd@edvax.de> <1483378580.815169.835118185.09E0A997@webmail.messagingengine.com> <20170102193911.9bfbb0cb.freebsd@edvax.de> <1483385148.838475.835195569.6E8F7BAE@webmail.messagingengine.com> <1483386931.845033.835218753.5BFAB221@webmail.messagingengine.com> <20170102225703.d3c5e4eb.freebsd@edvax.de> <1483402467.896986.835398409.47FE2671@webmail.messagingengine.com> <1483403766.900547.835409857.5EC09702@webmail.messagingengine.com> <20170103014613.3687686c.freebsd@edvax.de> <1483454121.4186863.835921561.2AE250D0@webmail.messagingengine.com> <1483454376.4187797.835927353.34E86D15@webmail.messagingengine.com> <87e1fcf7-a528-8959-3fba-a4395454ca36@bananmonarki.se> <1483471616.861917.836258425.4D61262F@webmail.messagingengine.com>
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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@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@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" > ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++
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