Date: Wed, 3 Jan 2007 09:35:05 +0100 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: "R. B. Riddick" <arne_woerner@yahoo.com> Cc: Ivan Voras <ivoras@fer.hr>, freebsd-geom@freebsd.org Subject: Re: Recommended gmirror solution with swap? Message-ID: <20070103083505.GB6253@garage.freebsd.pl> In-Reply-To: <20070102100137.87140.qmail@web30310.mail.mud.yahoo.com> References: <end8fg$u72$1@sea.gmane.org> <20070102100137.87140.qmail@web30310.mail.mud.yahoo.com>
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--5QAgd0e35j3NYeGe Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jan 02, 2007 at 02:01:37AM -0800, R. B. Riddick wrote: > --- Ivan Voras <ivoras@fer.hr> wrote: > > Gary Palmer wrote: > >=20 > > > Except in the case where a drive holding some swapped out memory goes= bad > > > and the system panics or crashes as a result. It might not make as > > > much sense for desktops, but if I were (still) building servers I'd > > > mirror everything that the system depended on to run. > >=20 > > Well, yes... though the "only" things lost in this case are the > > processes using the swap :) But you're right in the general case. > >=20 > Hmm... I wonder what gmirror is good for, when one of its consumers fails= =2E.. >=20 > I just setup this test setting: > 1. gnop on ad0s1gd > 2. gmirror on ad0s1gd.nop (hardcoded (-h)) and ad0s1ge > 3. dd (writes from /dev/urandom to the mirror) > 4. gnop configure -v -f 100 ad0s1gd.nop > 5. dd becomes unresponsive; CTRL+t says: > load: 0.78 cmd: dd 11034 [physwr] 0.01u 0.68s 0% 612k I can't reproduce it. What block size did you use for dd(1)? I did a lot of testing in the past with gmirror/graid3 and gnop(8), actually, this is why I implemented gnop(8) in the first place. If it doesn't work, it's a bug in gmirror, but I can't reproduce it with quite recent current. From what I see you're not using recent current, because there is no '-f' option for gnop(8) anymore, but it should also work with RELENG_6, so more info which will allow me to reproduce the problem would be helpful. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --5QAgd0e35j3NYeGe Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (FreeBSD) iD8DBQFFm2q5ForvXbEpPzQRAmZHAJ4uXy2rF8H17S/sFLZ6ch196drhVwCcDaOk 3YFRwuB8TFkCp/x3LOWDNjo= =+ry4 -----END PGP SIGNATURE----- --5QAgd0e35j3NYeGe--
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