From mboxrd@z Thu Jan 1 00:00:00 1970 From: Salatiel Filho Subject: Re: Input/Output error reading from a clean raid Date: Mon, 23 Jan 2017 11:42:04 -0300 Message-ID: References: <22661.19403.314279.130591@quad.stoffel.home> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <22661.19403.314279.130591@quad.stoffel.home> Sender: linux-raid-owner@vger.kernel.org To: John Stoffel Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids The output of the command is: # dd if=3DFotos.zip of=3D/dev/null dd: error reading =E2=80=98Fotos.zip=E2=80=99: Input/output error 328704+0 records in 328704+0 records out 168296448 bytes (168 MB) copied, 0.127723 s, 1.3 GB/s or # cp Fotos.zip /tmp/ cp: error reading =E2=80=98Fotos.zip=E2=80=99: Input/output error cp: failed to extend =E2=80=98/tmp/Fotos.zip=E2=80=99: Input/output error There is nothing on dmesg after running those commands; []'s Salatiel On Sun, Jan 22, 2017 at 9:18 PM, John Stoffel wrote: > > Salatiel> I am trying to recover a few files from my backup. The > Salatiel> backup is on a raid 5 + ext4. There are several files where > Salatiel> i get I/O error. The raid appears to be clean and fsck shows > Salatiel> no errors. Any ideas what could it be ? > > Salatiel> md1 : active raid5 sdd1[0] sdg1[4] sdf1[2] sde1[1] > Salatiel> 3220829184 blocks super 1.2 level 5, 512k chunk, algorith= m 2 [4/4] [UUUU] > Salatiel> bitmap: 1/8 pages [4KB], 65536KB chunk > > It would help if you could post the error(s) you're getting, along > with any output from dmesg during that time. Have you done a full > scan of the disk looking for errors? You might just have silent > read errors in your array. So as root do: > > # echo check >>/sys/block/md??/md/sync_action > > where md?? is the name of your md array you want to check. You can > get the name from: > > cat /proc/mdstat > > and of course it would help to post that info as well if you want more > help. > > John