From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD801C433E7 for ; Mon, 19 Oct 2020 17:31:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 34487222B8 for ; Mon, 19 Oct 2020 17:31:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="didYpT73" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726318AbgJSRbK (ORCPT ); Mon, 19 Oct 2020 13:31:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42246 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725887AbgJSRbK (ORCPT ); Mon, 19 Oct 2020 13:31:10 -0400 Received: from mail-ot1-x331.google.com (mail-ot1-x331.google.com [IPv6:2607:f8b0:4864:20::331]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 934C0C0613CE for ; Mon, 19 Oct 2020 10:31:10 -0700 (PDT) Received: by mail-ot1-x331.google.com with SMTP id m11so314279otk.13 for ; Mon, 19 Oct 2020 10:31:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:references:in-reply-to:mime-version:thread-index:date :message-id:subject:to:cc; bh=pJIUJ5QNdRBGJYdcyxD1JFps945oarPiJjBSnB5aIE8=; b=didYpT731gwGko5wlC/HpqBopg48gxdrBDtpxi32FsXCq4UWSikvZCiYASp9eYI4c3 jmeYkuXD/Zt35/yK+z33Xu/eNQF3phfXXi3li8Qzxm2rbLwqOPy8/HgyQZgTo90udC4h /rTkxWJIRdTgwC0V8FEzV2AqeGMMrUyvdQ4MU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:references:in-reply-to:mime-version :thread-index:date:message-id:subject:to:cc; bh=pJIUJ5QNdRBGJYdcyxD1JFps945oarPiJjBSnB5aIE8=; b=UcAWu1M+82oay7rCGlSaPI4K/uUuBpxhm4ScN4dfHBzNlw42vjDcmQxPDo8ivpRrdB Wm8xFF/4vr4v3eV44ixhi6hFB7aKTnpWdqTXTTUOo5UZvkWRwQqogkhrYnwKuvEf4iev r8jsXyYSVRfrOVnvX69Hxl/UrsBqNqG/ysZL0YXwbeHOKeOHRo27lqgJTfyVLvDjuFoz 1pFVJ2WYh7VybRbRDSmfEWi9Yj8VIYIIckMZ4OZyJZDSQZfwvyXO+VNIPM6yxUHMxPAH SRNNghtyQnUalkoUgU7YQ36W0vYlc8DdDs8U8+Mg7X9A8KcvHu72XumdawT4iDSf9eWI +sXA== X-Gm-Message-State: AOAM531ntDJ6pWOLK3qP44ptv8Cp7HqeyQQE9aMIRj96WyEvtMBmN4DZ 6wnPUQtIeuyCvsQwaOuWgQM2BaD/pJtuwM3QnFi9tnE7mCk= X-Google-Smtp-Source: ABdhPJzIFFBiYHsZqrH0yU5QX0ZIFaG9CTnhucqWIm0giUEeSfgy0CPnb/IIpYdrTesKFLujZJD/l1uroEbIoWGyRhs= X-Received: by 2002:a9d:3f44:: with SMTP id m62mr788942otc.364.1603128669841; Mon, 19 Oct 2020 10:31:09 -0700 (PDT) From: Muneendra Kumar M References: <1602732462-10443-1-git-send-email-muneendra.kumar@broadcom.com> <1602732462-10443-6-git-send-email-muneendra.kumar@broadcom.com> <5ca752c2-94e1-444a-7755-f48b09b38577@oracle.com> <3803E6D0-68D6-407F-80AB-A17E7E0E69E3@oracle.com> In-Reply-To: MIME-Version: 1.0 X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQFATVqLRX+cZ5DMpa/LB2sUjSWzQAGJthEBAcREcNICYfc3iwLXtvtQAo/g/YwBakTnWapnz3KA Date: Mon, 19 Oct 2020 23:01:07 +0530 Message-ID: Subject: RE: [PATCH v3 05/17] scsi_transport_fc: Added a new rport state FC_PORTSTATE_MARGINAL To: Hannes Reinecke , Michael Christie Cc: linux-scsi@vger.kernel.org, jsmart2021@gmail.com, emilne@redhat.com, mkumar@redhat.com Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000eaf39c05b2097a5e" Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org --000000000000eaf39c05b2097a5e Content-Type: text/plain; charset="UTF-8" Hi Michael, > > > Oh yeah, to be clear I meant why try to send it on the marginal path > when you are setting up the path groups so they are not used and only the > optimal paths are used. > When the driver/scsi layer fails the IO then the multipath layer will > make sure it goes on a optimal path right so you do not have to worry > about hitting a cmd timeout and firing off the scsi eh. > > However, one other question I had though, is are you setting up > multipathd so the marginal paths are used if the optimal ones were to > fail (like the optimal paths hit a link down, dev_loss_tmo or > fast_io_fail fires, etc) or will they be treated like failed paths? > > So could you end up with 3 groups: > > 1. Active optimal paths > 2. Marginal > 3. failed > > If the paths in 1 move to 3, then does multipathd handle it like a all > paths down or does multipathd switch to #2? > >Actually, marginal path work similar to the ALUA non-optimized state. >Yes, the system can sent I/O to it, but it'd be preferable for the I/O to >be moved somewhere else. >If there is no other path (or no better path), yeah, tough. >Hence the answer would be 2) [Muneendra]As Hannes mentioned if there are no active paths, the marginal paths will be moved to normal and the system will send the io. 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