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Date: Sun, 8 Oct 2006 08:22:13 -0700 (PDT)
From: "R. B. Riddick" <arne_woerner@yahoo.com>
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Subject: 2 bonnies can stop disk activity permanently
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Hi!=0A=0AWe (me and Veronica) mentioned, that starting 2 bonnie (ports/benc=
h) processes on a UFS=0A1. on a geom_bsd, geom_disk (like ad4 or da0) and g=
eom_stripe (using ad4a, ..., ad10a)=0A2. with different controllers areca a=
nd nVidia and different motherboards and=0A3. with up to 8 SATA disks=0Ares=
ults in a permanently disk-dead system.=0A=0A=0AVeronica's box had more tha=
n 700MB of free memory (according to top), when it happened.=0A=0AHeavy loa=
d (caused by blogbench, rawio, raidtest and dd) causes no problem, while bo=
nnie gets stuck somewhere between putc phase and end of rewrite phase.=0A=
=0AThe bonnie processes were blocked due to "nbufkv" (some VFS reason).=0AG=
eom activity is impossible then (no file system activity happens).=0ANo sys=
log message can be seen on the console.=0A=0ABye=0A-A&V=0A=0A=0A=0A