From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from truschnigg.info (truschnigg.info [89.163.150.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C793984D12; Thu, 11 Jul 2024 09:00:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=89.163.150.210 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720688448; cv=none; b=nPz7affMS8XkmqymjcO1T1tl5ZZdmqXc2XiLYsnoxhqcvmqzcU5t5RN0z22rLJf/dQlCtn1jIxlOGbibY8KfQ6RTpI627RO2r9DsDp22xRq+1C+EtUht1GHCrwbycVKHroSnBdWaX76CHd1i9bwmS+HpLb0blEkYvlH9eZzNqTE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720688448; c=relaxed/simple; bh=mRczEEAH6XeYv8BF6ySO7OwPG/kDJ2JRgS0b/aWEgsI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=TgL77lYuaUgfaoSxe1jBVJeDHvBFIjqGqYmvZupckMuCqPYmXWDTwl44h9ZXB+Dqmu8bDkZt6S1z5TVQDrcoW9FRl4KyAhGTCfIcXOoi8doCfSv0NHg5F6NXEzkOgxD6no3McCQ/YUq+U+ofagd3Apa1129BSlJUKcmEo9/uFoQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=truschnigg.info; spf=pass smtp.mailfrom=truschnigg.info; dkim=pass (2048-bit key) header.d=truschnigg.info header.i=@truschnigg.info header.b=W4H1pjbM; arc=none smtp.client-ip=89.163.150.210 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=truschnigg.info Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=truschnigg.info Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=truschnigg.info header.i=@truschnigg.info header.b="W4H1pjbM" DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=truschnigg.info; s=m22; t=1720687902; bh=mRczEEAH6XeYv8BF6ySO7OwPG/kDJ2JRgS0b/aWEgsI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=W4H1pjbM55ZHcp7dfatkvrIiONYtu4iTWt+hhFUooUlgmfVGxQ5J0TB01mBE88cLs OmbObZ0nprP25rbJQXW1BcbkLS5S8ZDdY7gyZnZWFfx7fgdg/fFW8a0/V0prS7jITE ECHPa5PfNrPqboIlb20vK6is0r4lsnpkBtiOZGQTerGpN6JjRhyyh+3wCyWjNsRHs6 hUAp+khV+YpUU0Ii5VNgPC082HSdmkF1ips1MT1l24RP68bMdKl3uGykLf8XPz2cfO 7JQQseNiU5go2amrWY54KXzXxeoTIKs0oiWxsI30WOoRavlc+kK+rb9iVqP7wx+vb9 BTRkcGVBo3Few== Received: from vault.lan (unknown [IPv6:2a02:1748:fafe:cf3f:1eb7:2cff:fe02:8261]) by truschnigg.info (Postfix) with ESMTPSA id 3D6D820435; Thu, 11 Jul 2024 08:51:42 +0000 (UTC) Date: Thu, 11 Jul 2024 10:51:39 +0200 From: Johannes Truschnigg To: Dave Chinner Cc: Paul Menzel , linux-raid@vger.kernel.org, linux-nfs@vger.kernel.org, linux-block@vger.kernel.org, linux-xfs@vger.kernel.org Subject: Re: How to debug intermittent increasing md/inflight but no disk activity? Message-ID: References: <4a706b9c-5c47-4e51-87fc-9a1c012d89ba@molgen.mpg.de> Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="CA/8qHnSry4tIedh" Content-Disposition: inline In-Reply-To: --CA/8qHnSry4tIedh Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable I just wanted to chime in to express a sincere "thank you!" to all of you involved in this thread, for providing such a terrific example of how to clearly and exhaustively present a systems problem, and then also how to methodically determine its root cause. If there were a textbook on this subject in the IT/CompSci context (if there is, please let me know!), *this* exchange should make it into the next edit= ion on how to get problems analyzed and resolved. I will keep it in my personal bookmarks right next to [0], which is a short but great essay about how what you just put into practice is possible in theory, and which I've used whenever needed to inspire hope in others (and, truth be told, also in myself :)) in the face of the daunting complexity of modern computer systems. [0]: https://blog.nelhage.com/post/computers-can-be-understood/ --=20 with best regards: - Johannes Truschnigg ( johannes@truschnigg.info ) www: https://johannes.truschnigg.info/ --CA/8qHnSry4tIedh Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEGu9IhkI+7/aKLUWF95W3jMsYfLUFAmaPnRgACgkQ95W3jMsY fLVRfg//UdNTCBR+P2/nOsG3Si2N6n/AOMKgTJKZBlcUas0eKuuqKvjHTVk6Z5nM WZgyBY3dUW/vDn6ZhpEZg2NA+uHSEWd3HbSpXEgrJ/JZJN2t3vciwSEzdIoA6qy/ 0QCSbdR8PwxpPSWemkfGeQXblT3ZcgrjGaLyEjPkKF3GxOKGsW81F5YIdQyJkrLQ lGgj/luNdacT7qTbII169+VlBe4QQsRm71mG2oGgnjgl2/rVLLmqmBpGYYrkLJH8 dCZ6jmRQryWsphKWKisWOQD7Je34tRNkAZO36Upb6oRNf5XgsdtPummYZNpxoCJm ft69lsgeGaYnN5mKjUbA+KMj9UiSqPygEeQXNVlQWGuKVjN8PBKG4GFvkV8p41T9 XvZuAorpiAnEiVr971pmm0q5NoOVBXLM/h5r+5Q6CFTYGGYeX5iVUxUkWtwG8eAV 0xVJ15JSnLQeGHynQs8jgKN49iwmqbJq4l4bs+paLH4hzpx3tCvzl1nH23pYQXof g9igwMErSWWBNkJPXcomiaFL7tMFT/ensfkRxvSObDIuNZ4zaF/DuyPQZJygyOYi XoJQqM5umzY7KGTT7kbGNr1mUJiVLunfBiBwuzYX2wW30hKlubnm4m/HOl2HTJGT EGhRxv8gkYeS/TNBMtqCKNLh93Uz1yIaNm8MTgloCnV7DXrhNYc= =HCJz -----END PGP SIGNATURE----- --CA/8qHnSry4tIedh--