From nobody Sun Dec 11 06:52:48 2022 X-Original-To: freebsd-fs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4NVFnc3Hs1z4kkTY for ; Sun, 11 Dec 2022 06:52:52 +0000 (UTC) (envelope-from artemkuchin76@gmail.com) Received: from mail-lf1-x12f.google.com (mail-lf1-x12f.google.com [IPv6:2a00:1450:4864:20::12f]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4NVFnb2hxNz3nLY for ; Sun, 11 Dec 2022 06:52:51 +0000 (UTC) (envelope-from artemkuchin76@gmail.com) Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20210112 header.b=J9x8miPi; spf=pass (mx1.freebsd.org: domain of artemkuchin76@gmail.com designates 2a00:1450:4864:20::12f as permitted sender) smtp.mailfrom=artemkuchin76@gmail.com; dmarc=pass (policy=none) header.from=gmail.com Received: by mail-lf1-x12f.google.com with SMTP id b13so13508357lfo.3 for ; Sat, 10 Dec 2022 22:52:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:subject:from:content-language:to :user-agent:mime-version:date:message-id:from:to:cc:subject:date :message-id:reply-to; bh=Sa9CINIoDBMpdKFh21Aj6Gvn+N1XBADvAp7xdwT3kXI=; b=J9x8miPiE029zSYUNVqKTCRiiBCHbsdroMkVAp643Rk5VCHyt3QNXkZpxbmDe0W2PY d3Et8XeSx8ePbXi5rUv3Sq5nIoREZoJ+Xg2JLw/gho8hsiB/bFGVMzq2AP4I6KLC6V8z QW9FzM4qhSszulfj8SvxMz3E9epYrf7Nv5/9WC9IQh+G2UG2aBXmc69JGFXJ4xwrtOXQ c32RCwmAUp0nWpRonN6zgOs3r3pUViW0d1teCyl+wR4isqcA02xOUKTvmB41nB9cyCjM k2rBPEmBM3sA4MZVysZP7doZFpe9d5c6Q8ib3GWT+RqnqRPNE/KY1DeS7lq1HqEhzDi1 gvrw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:subject:from:content-language:to :user-agent:mime-version:date:message-id:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=Sa9CINIoDBMpdKFh21Aj6Gvn+N1XBADvAp7xdwT3kXI=; b=iikI0XaBlOFE15o2ndcG2q/OGpGeEN8zif4Poz/Bc6roasft5/ZzQoYIDc+ISpiDrC ZsV1b4LuPVwAD+MxvuemsfpzSOgTEIHYg7MmZplurxjtZaKKDDVLydAHjbF6GFKg9OYk NjaQ5SObZlovxf+RE1r7F+XZwnIZi2djR8E1SH8YJEwBx7oET5GAHHzg5tQstjwi7HxK HDiQ9Err+QHGTC3H3yflkYFl1Da/0SV/sQJIjvLwUrnOP2tfYLqawZYmvAql2EKD1mqF U4tFlpnA9O/tdRjrYOCvwtQtuaa8VNyjXHy5coculOkX8XliJehZ51t+QoawDfU6XzTB UsCA== X-Gm-Message-State: ANoB5pkN8Y8eKZDMWv29ocYEr3s+i+SQkICV2uVtFOrMLuYfERqwjo9/ 5qsHgW7QgCb+dGhEYm8bdgHJ0mBOAq8= X-Google-Smtp-Source: AA0mqf5CL9Dr0TTqDfPxq2V3TERRSzedzLZjOWFm7kC2WN64qlKWr4mtBGUa5JwM1bWG6RruKvYc8g== X-Received: by 2002:ac2:5189:0:b0:4b5:b705:8491 with SMTP id u9-20020ac25189000000b004b5b7058491mr1349092lfi.9.1670741569221; Sat, 10 Dec 2022 22:52:49 -0800 (PST) Received: from [192.168.0.12] ([185.22.24.200]) by smtp.googlemail.com with ESMTPSA id o19-20020a2e9b53000000b0026bf0d71b1esm827868ljj.93.2022.12.10.22.52.48 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 10 Dec 2022 22:52:48 -0800 (PST) Message-ID: <85c5a64c-915e-d790-e617-c94f3fb7cd9a@gmail.com> Date: Sun, 11 Dec 2022 09:52:48 +0300 List-Id: Filesystems List-Archive: https://lists.freebsd.org/archives/freebsd-fs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-fs@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.5.1 To: freebsd-fs@FreeBSD.org Content-Language: ru, en-US From: Artem Kuchin Subject: Everchanging bytes at the end of mirror disks Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.04 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-0.83)[-0.828]; NEURAL_SPAM_SHORT(0.79)[0.791]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20210112]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; MIME_GOOD(-0.10)[text/plain]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-fs@freebsd.org]; ARC_NA(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; TO_DN_NONE(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::12f:from]; DKIM_TRACE(0.00)[gmail.com:+]; MIME_TRACE(0.00)[0:+]; FROM_EQ_ENVFROM(0.00)[]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; FREEMAIL_ENVFROM(0.00)[gmail.com]; MLMMJ_DEST(0.00)[freebsd-fs@freebsd.org] X-Rspamd-Queue-Id: 4NVFnb2hxNz3nLY X-Spamd-Bar: -- X-ThisMailContainsUnwantedMimeParts: N Hello! I am writing a small utility for myseld and part of it is comparing gmirror disks. After running some tests i realized that some bytes at the very end of disks are constantly changing. For example to runs from the compator: Difference between /dev/ada0p3 [26,0x1A]  and /dev/ada1p3 [95,0x5F] at position 495812794495 Difference between /dev/ada0p3 [217,0xD9]  and /dev/ada1p3 [107,0x6B] at position 495812794496 Difference between /dev/ada0p3 [151,0x97]  and /dev/ada1p3 [0,0x0] at position 495812794497 Difference between /dev/ada0p3 [180,0xB4]  and /dev/ada1p3 [64,0x40] at position 495812794498 Difference between /dev/ada0p3 [96,0x60]  and /dev/ada1p3 [126,0x7E] at position 495812794499 Difference between /dev/ada0p3 [89,0x59]  and /dev/ada1p3 [239,0xEF] at position 495812794500 Difference between /dev/ada0p3 [234,0xEA]  and /dev/ada1p3 [93,0x5D] at position 495812794501 Difference between /dev/ada0p3 [166,0xA6]  and /dev/ada1p3 [76,0x4C] at position 495812794502 Difference between /dev/ada0p3 [185,0xB9]  and /dev/ada1p3 [233,0xE9] at position 495812794495 Difference between /dev/ada0p3 [145,0x91]  and /dev/ada1p3 [2,0x2] at position 495812794496 Difference between /dev/ada0p3 [105,0x69]  and /dev/ada1p3 [3,0x3] at position 495812794497 Difference between /dev/ada0p3 [55,0x37]  and /dev/ada1p3 [166,0xA6] at position 495812794498 Difference between /dev/ada0p3 [23,0x17]  and /dev/ada1p3 [99,0x63] at position 495812794499 Difference between /dev/ada0p3 [35,0x23]  and /dev/ada1p3 [144,0x90] at position 495812794500 Difference between /dev/ada0p3 [118,0x76]  and /dev/ada1p3 [212,0xD4] at position 495812794501 Difference between /dev/ada0p3 [30,0x1E]  and /dev/ada1p3 [149,0x95] at position 495812794502 End of disk is 495812794880, so, the last changing bytes if 378 bytes before the end. I am most likely missing some information about FS/mirror organization. Below is the filesystem configuration. However, if there a part which changes on both disks independently how do i get its offset and size, so i will not compare it.  Thank you. # gmirror status        Name    Status  Components mirror/swap  COMPLETE  ada0p2 (ACTIVE)                        ada1p2 (ACTIVE) mirror/root  COMPLETE  ada0p3 (ACTIVE)                        ada1p3 (ACTIVE) # gpart show =>       34  976773101  ada0  GPT  (466G)          34        128     1  freebsd-boot  (64K)         162    8388608     2  freebsd-swap  (4.0G)     8388770  968384365     3  freebsd-ufs  (462G) =>       34  976773101  ada1  GPT  (466G)          34        128     1  freebsd-boot  (64K)         162    8388608     2  freebsd-swap  (4.0G)     8388770  968384365     3  freebsd-ufs  (462G)