Date: Wed, 20 Dec 2006 00:33:44 +0100 From: "Raphael H. Becker" <rabe@p-i-n.com> To: Ivan Voras <ivoras@fer.hr> Cc: freebsd-geom@freebsd.org Subject: Re: gstripe oder graid3 on USB-Sticks Message-ID: <20061219233344.GA75640@p-i-n.com> In-Reply-To: <em9jj1$do2$1@sea.gmane.org> References: <20061214184940.GA50750@p-i-n.com> <em9jj1$do2$1@sea.gmane.org>
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Hello Ivan, On Tue, Dec 19, 2006 at 09:54:50PM +0100, Ivan Voras wrote: > Raphael H. Becker wrote: > > Hello *, > > > > today I bought 3 USB sticks to find out, if there's something to play > > with GEOM on it. My FreeBSD ist 6.2-RC1. > > > umass0: BBB reset failed, IOERROR This happened on pulling one of the three sticks. > As someone who had the same idea recently I can tell you that the > problem you're seeing is almost certainly in the motherboard. My sticks > draw ~250 mA, but it turns out my 4 USB ports are wired such that they > all share the same 500 mA source, resulting in weird and random > appearing errors when all three are connected. > > Try finding separately powered USB ports (new motherboards often have > them on board but lack the connectors). I use them on a USB hub with an external power supply. I don't think this is a power-issue cause I tried this last year using two self powered USB2.0 HDD with geom-stripe. Same result: writing is pretty good, reading a file using dd locks up. (6.0-RELEASE) Maybe, I will try this next days, it is an issue about reading parallel from different devices on a USB hub, which (probably) cannot satisfy two concurrent tasks at the same time at the same root-hub/port. gstripe3 was able to rebuild the RAID after re-inserting an arbitrary stick of the 3, so USB+GEOM seems to be fine here. Maybe this I completly unrelated to GEOM, I cannot guess this. Regards Raphael
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