Date: Sat, 28 Oct 2006 14:33:33 -0400 From: srwadleigh <srw@udor.net> To: freebsd-stable@freebsd.org Subject: Re: gmirror + usb problem Message-ID: <20061028143333.2aef1a7d@localhost> In-Reply-To: <45433D5E.6070305@cold.dk> References: <20061027012611.71089229@localhost> <20061027112846.224d6dee@localhost> <45433D5E.6070305@cold.dk>
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On Sat, 28 Oct 2006 13:22:06 +0200 Brian Josefsen <bj@cold.dk> wrote: > srwadleigh wrote: > > On Fri, 27 Oct 2006 01:26:11 -0400 > > srwadleigh <srw@udor.net> wrote: > > > > > >> Thinkpad T41 > >> 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #20: Thu Oct 26 05:15:07 EDT > >> > >> Two usb attached WD myBook 500gb external drives. The first drive > >> is setup as a gmirror provider, and mounts/functions fine, when I > >> attempt to add the second external drive it detects but will not > >> rebuild, it simply remains at 0%, no drive activity. > >> > >> Following the attempt to rebuild any attempt to stop the providers > >> or remove the stale drive causes the system to lockup or rather > >> become almost entirely unresponsive. Responds to pings, moused > >> input works, existing ssh sessions still function, but cannot > >> login, execute new commands, or get output without serious delays, > >> sometimes--eventually the system snaps back and everything is fine > >> but it can take a very long time. Nothing seems to entice the > >> second provider to sync up. > >> > >> I have tried setting gmirror to auto rebuild and manual, both yield > >> the same result. I have also tries each drive as the first > >> provider, again with the same results either way. Also tried > >> gmirror compiled in and as a mo > >> > >> I'm not sure if this is gmirror, usb, or the combo of the two > >> elements, or maybe even something with the mybook. > >> > >> > > > > An addition, the second provider does rebuild, just extremely > > slowly, according to the activity lights moving data only in short > > bursts spaced by long periods of inactivity. In the last eight > > hours the provider has reached 2%. > > > Hi > > I'm no expert here but, i would suspect that the proces is slow > because the usb controller is fighting for the bandwidth same way as > if you try to shift data from ad0 to ad1, perhaps use another usb > port for one of the disk and check top to see if usbd is having a > hard time. In general though i know that usb isn't the most fantastic > place to store your data as the intermediate controller can't push > the information about bad blocks etc. through usb. > > -- > Med venlig hilsen / Best regards > Brian Josefsen > Copenhagen, Denmark > That sounds quite possible, the one curious thing is rsyncing between the two drives, while it takes a long time to copy the full capacity, the drives do work continuously. Same two usb ports in question. It seems to me if rsync can run a big copy gmirror would be doing something similar but at a lower level, and maybe that makes all the difference to the usb controller. Soon I will have another system available to test with, likely better usb controller and firewire. Thanks
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