Date: Tue, 4 May 2010 18:16:35 +0200 From: Lassi Tuura <lat@cern.ch> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-fs@freebsd.org Subject: Re: Instant crash with ZFS + iozone? Message-ID: <43B635E5-A901-4EA4-AE03-8A61E8F3F200@cern.ch> In-Reply-To: <20100504004905.GA12233@icarus.home.lan> References: <4529AF96-4BFF-4424-B77F-FE5BC8AE43D3@cern.ch> <20100504004905.GA12233@icarus.home.lan>
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Hi, > This sounds like a hardware problem to me -- particularly excessive draw > on the PSU, voltage issues, or other whatnots. Especially if the screen > goes black (no cursor, monitor not in power save mode) and requires a > hard reset. Possibly the problem is only witnessed under extreme disk > I/O combined with high CPU usage + memory I/O. Thanks, that does look like plausible explanation here. I'll see what I can do. As you suggested, I made some tests with various number of disks and read/write patterns; ZFS is totally peripheral to this, I can get dd to induce similar failures. Two drives is ok, three only if there's not a lot of seeking, four only if two are reading and two are writing sequentially (no seeking at all). Selectively taking drives out and/or rearranging drives doesn't change this - it's not an issue with any one drive that I can tell - so will focus on PSU next. (Re Josh' reply I was in fact running iozone as root. Will keep in mind.) Regards, Lassi
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