From nobody Sun Dec 11 08:22:46 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 4NVHnc4vgCz4jj1n for ; Sun, 11 Dec 2022 08:23:00 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: from mail-ej1-x62c.google.com (mail-ej1-x62c.google.com [IPv6:2a00:1450:4864:20::62c]) (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 4NVHnc21gTz3t7v for ; Sun, 11 Dec 2022 08:23:00 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Authentication-Results: mx1.freebsd.org; none Received: by mail-ej1-x62c.google.com with SMTP id b2so20928286eja.7 for ; Sun, 11 Dec 2022 00:23:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20210112.gappssmtp.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=NVQrVCdcATQ90gtT1NZv6t/9ayUQxhPokqMq8jo0L5w=; b=lboUA1D/AeHnGuCzVg6plHbXoikMqENFZPuKnBHZ9JjUzYw4HOrMQ8zKEvUDlH+TP6 Wbutgp+dOKzkrtDB5W+JMVqHf0AcUre4mdUEe4rCp6Ltk2uL28OQrQ4j++lf/rfKBVLq j8c0S/utRxlMBkgX8wTxVUnmg2NCmQ0L0A8xMM4JtKzWwShNx05etD4ITa/wmMMgZ5yE PLoURqZsUjfOtefRIRUd399YJ3l5gXFh0X3nzaAeWIoPmtOgqyEy8KpdUcODHcpTvClF XiShQKg6zjRtjMTdqJZt4z+UXu8ejv3MXKx1oTcnYVMXF8TjKgO2GF3kTtiqhlkMYV02 tHog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=NVQrVCdcATQ90gtT1NZv6t/9ayUQxhPokqMq8jo0L5w=; b=ca/y13qtKN0c638FjVRqZpjUq/xtzEHRdZmfsYxb5taOLHVxHmpZAmPEcvXQ0cKodM m928mZ+3heDvPis/Y5DpEBOIjgrdaWkSyKmxAKdQ8QoxaXAZBc8BB0gh3UDefO3GrLtf 4qmDUXFN141FqSl86yI6PLXRIO1FDTe6EGB4gJrEM5HMaUw8xTpprG/2DHiYJ7bCi3rT QNxNeUaJZHyC5Y6tQftRuOW1qxji99qf3hkynwLqv34VGKe0BcnhaiBCJQdgxeu47h6A lwuIkArDxZWOoD0dz3Lxyv7le/FsMra11PsOaYAX5mc1+igRp7LknJSPh0mZkhrg94uP ZP9A== X-Gm-Message-State: ANoB5pmnAaaq5ZTip5ejAcBv/214o6CpC6BbxJdU+c41accCYVnTPEof PebvoAvyrU8Y098n2L/Jo+OTDmZfIRX5hF6pCcjreQ== X-Google-Smtp-Source: AA0mqf70MpjrBfYc7U/2OooRY/y+ff9YMs+OryXdLAECmXPSLHCje72vgrNghby4clTMJfR1Qek+U2fnQPxM0fyfYYk= X-Received: by 2002:a17:906:3e09:b0:7c0:e6d8:3e82 with SMTP id k9-20020a1709063e0900b007c0e6d83e82mr15854566eji.451.1670746978032; Sun, 11 Dec 2022 00:22:58 -0800 (PST) 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 References: <85c5a64c-915e-d790-e617-c94f3fb7cd9a@gmail.com> In-Reply-To: <85c5a64c-915e-d790-e617-c94f3fb7cd9a@gmail.com> From: Warner Losh Date: Sun, 11 Dec 2022 01:22:46 -0700 Message-ID: Subject: Re: Everchanging bytes at the end of mirror disks To: Artem Kuchin Cc: FreeBSD FS Content-Type: multipart/alternative; boundary="00000000000022b48b05ef89183d" X-Rspamd-Queue-Id: 4NVHnc21gTz3t7v X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-ThisMailContainsUnwantedMimeParts: N --00000000000022b48b05ef89183d Content-Type: text/plain; charset="UTF-8" On Sat, Dec 10, 2022, 11:52 PM Artem Kuchin wrote: > 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. > The last sector has metadata about the mirror and about the mirror element. It's this latter data that differs. Warner 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) > > > > > > --00000000000022b48b05ef89183d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Sat, Dec 10, 2022, 11:52 PM Artem Kuchin <artemkuchin76@gmail.com> wrote:=
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.
=

The last sector has metadata = about the mirror and about the mirror element.=C2=A0 It's this latter d= ata that differs.

Warner=


For example to runs from the compator:

Difference between /dev/ada0p3 [26,0x1A]=C2=A0 and /dev/ada1p3 [95,0x5F] at=
position 495812794495
Difference between /dev/ada0p3 [217,0xD9]=C2=A0 and /dev/ada1p3 [107,0x6B] = at
position 495812794496
Difference between /dev/ada0p3 [151,0x97]=C2=A0 and /dev/ada1p3 [0,0x0] at =
position 495812794497
Difference between /dev/ada0p3 [180,0xB4]=C2=A0 and /dev/ada1p3 [64,0x40] a= t
position 495812794498
Difference between /dev/ada0p3 [96,0x60]=C2=A0 and /dev/ada1p3 [126,0x7E] a= t
position 495812794499
Difference between /dev/ada0p3 [89,0x59]=C2=A0 and /dev/ada1p3 [239,0xEF] a= t
position 495812794500
Difference between /dev/ada0p3 [234,0xEA]=C2=A0 and /dev/ada1p3 [93,0x5D] a= t
position 495812794501
Difference between /dev/ada0p3 [166,0xA6]=C2=A0 and /dev/ada1p3 [76,0x4C] a= t
position 495812794502

Difference between /dev/ada0p3 [185,0xB9]=C2=A0 and /dev/ada1p3 [233,0xE9] = at
position 495812794495
Difference between /dev/ada0p3 [145,0x91]=C2=A0 and /dev/ada1p3 [2,0x2] at =
position 495812794496
Difference between /dev/ada0p3 [105,0x69]=C2=A0 and /dev/ada1p3 [3,0x3] at =
position 495812794497
Difference between /dev/ada0p3 [55,0x37]=C2=A0 and /dev/ada1p3 [166,0xA6] a= t
position 495812794498
Difference between /dev/ada0p3 [23,0x17]=C2=A0 and /dev/ada1p3 [99,0x63] at=
position 495812794499
Difference between /dev/ada0p3 [35,0x23]=C2=A0 and /dev/ada1p3 [144,0x90] a= t
position 495812794500
Difference between /dev/ada0p3 [118,0x76]=C2=A0 and /dev/ada1p3 [212,0xD4] = at
position 495812794501
Difference between /dev/ada0p3 [30,0x1E]=C2=A0 and /dev/ada1p3 [149,0x95] a= t
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.=C2=A0 Thank you.


# gmirror status
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Name=C2=A0=C2=A0=C2=A0 Status=C2= =A0 Components
mirror/swap=C2=A0 COMPLETE=C2=A0 ada0p2 (ACTIVE)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ada1p2 (ACT= IVE)
mirror/root=C2=A0 COMPLETE=C2=A0 ada0p3 (ACTIVE)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ada1p3 (ACT= IVE)

# gpart show
=3D>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 34=C2=A0 976773101=C2=A0 ada0= =C2=A0 GPT=C2=A0 (466G)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 34=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 128=C2=A0=C2=A0=C2=A0=C2=A0 1=C2=A0 freebsd-boot= =C2=A0 (64K)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 162=C2=A0=C2=A0=C2=A0 8388= 608=C2=A0=C2=A0=C2=A0=C2=A0 2=C2=A0 freebsd-swap=C2=A0 (4.0G)
=C2=A0=C2=A0=C2=A0=C2=A0 8388770=C2=A0 968384365=C2=A0=C2=A0=C2=A0=C2=A0 3= =C2=A0 freebsd-ufs=C2=A0 (462G)

=3D>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 34=C2=A0 976773101=C2=A0 ada1= =C2=A0 GPT=C2=A0 (466G)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 34=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 128=C2=A0=C2=A0=C2=A0=C2=A0 1=C2=A0 freebsd-boot= =C2=A0 (64K)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 162=C2=A0=C2=A0=C2=A0 8388= 608=C2=A0=C2=A0=C2=A0=C2=A0 2=C2=A0 freebsd-swap=C2=A0 (4.0G)
=C2=A0=C2=A0=C2=A0=C2=A0 8388770=C2=A0 968384365=C2=A0=C2=A0=C2=A0=C2=A0 3= =C2=A0 freebsd-ufs=C2=A0 (462G)





--00000000000022b48b05ef89183d--