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Sun, 5 Sep 2021 13:33:50 -0700 Subject: Re: Locating ZFS checksum errors To: freebsd-questions@freebsd.org References: From: David Christensen Message-ID: <36a79a52-54cd-0d45-264e-43d108612846@holgerdanske.com> Date: Sun, 5 Sep 2021 13:33:45 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4H2jtJ6J2zz4hl5 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=holgerdanske.com header.s=nov-20210719-112354 header.b=X1U7HCIt; dmarc=pass (policy=none) header.from=holgerdanske.com; spf=pass (mx1.freebsd.org: domain of dpchrist@holgerdanske.com designates 2001:470:0:19b::b869:801b as permitted sender) smtp.mailfrom=dpchrist@holgerdanske.com X-Spamd-Result: default: False [-2.89 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[holgerdanske.com:s=nov-20210719-112354]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; R_SPF_ALLOW(-0.20)[+a:november.he.net]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_SPAM_SHORT(0.11)[0.114]; DKIM_TRACE(0.00)[holgerdanske.com:+]; DMARC_POLICY_ALLOW(-0.50)[holgerdanske.com,none]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:6939, ipnet:2001:470::/32, country:US]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-questions]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 05 Sep 2021 20:34:02 -0000 On 9/4/21 2:56 AM, Jimmy Olgeni wrote: > > Hi, > > Short version of the story: due to a bad RAM stick I managed to collect some > checksum errors on a ZFS pool; they are not reported by a scrub, but show up > when running "zdb -bcsvL". > > They look like this: > > capacity operations bandwidth ---- errors ---- > description used avail read write read write read write cksum > rpool 469G 451G 1.65K 0 146M 0 0 0 0 > mirror 469G 451G 1.65K 0 146M 0 0 0 0 > /dev/gpt/pool1 843 0 73.0M 0 0 0 98 > /dev/gpt/pool0 842 0 73.1M 0 0 0 98 > > A few of them are logged during the scan: > > zdb_blkptr_cb: Got error 97 reading <404, 0, 1, 17> DVA[0]=<0:e0956e000:6000> DVA[1]=<0:1200c25000:6000> [L1 DMU dnode] fletcher4 lz4 unencrypted LE contiguous unique double size=20000L/6000P > birth=7322L/7322P fill=5419 cksum=743743d4a15:652404d7275bf1:349b01108bcc58b4:6eb5731a7332a4d1 -- skipping > Now, how do I find out which files (or whatever else) are affected, in order to > fix them? :) > > I tried to get a detailed log from zdb with all the DVAs and checksums, but I > could not find any match. On 9/5/21 4:37 AM, Graham Perrin wrote: > On 05/09/2021 08:34, Jimmy Olgeni wrote: > >> I restored some random files (a few package builds) and the errors >> went away.. How did you determine which files to restore? David