Date: Tue, 4 May 2010 01:22:35 +0200 From: Lassi Tuura <lat@cern.ch> To: <freebsd-fs@freebsd.org> Subject: Instant crash with ZFS + iozone? Message-ID: <4529AF96-4BFF-4424-B77F-FE5BC8AE43D3@cern.ch>
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Hi, I've just started playing with FreeBSD and ZFS. I installed 8.0-RELEASE, then 8.0-STABLE 201004 (amd64) on a system with = 4 * 1TB hard drives for ZFS (2 * Hitachi Deskstar 7K2000, 2 * Samsung = SpinPoint F3), plus 2GB IDE flash for OS itself (Transcend), 4GB ECC = RAM, AMD Athlon II X2 235e CPU, Asus M4A78L-M LE motherboard. I can use the basic system fine. However when I create a ZFS volume out = of the 4 disks and run iozone on it, the system will reliably die within = 5 seconds or so, sometimes it takes a little longer, up to a minute or = so. By "die" I mean the screen goes completely blank, and it will no longer = respond to anything - no network, not even ping and any existing network = connections will die, no keyboard, screen totally black without as much = as a cursor... nothing. The soft power button won't work either. AFAIK = the only thing that works is the reset button. When the system comes back, /var/log is silent on last 30 seconds = preceding the crash. The same thing occurs with drives in ATA and = SATA/AHCI mode in BIOS, with or without "ahci_load=3D"YES"" in = /boot/loader.conf. So my first question as a FreeBSD newbie is: how do I get to see why = this happens? It could be some simple hardware conflict, but how do I = get the system to tell me what is wrong? Without even a panic message on = screen I am a bit lost... If I get a serial-to-usb cable and send = console there, would I see more? I don't currently configure a swap = device; would that help to get a crash dump? As far as I can tell, this is not caused by ZFS ARC. When I manage to = run arcstats.pl and the system runs long enough, ARC size remains = tolerable (~1GB) as long as I get output on screen. I did do the ZFS = tuning guide's config in /boot/loader.conf, but it doesn't change = anything. So far I am assuming some bad hardware interaction = somewhere... Regards, Lassi=
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