Re: Input/Output error reading from a clean raid

[Salatiel Filho <salatiel.filho@gmail.com>]

The output of the command is:

# dd if=Fotos.zip of=/dev/null
dd: error reading ‘Fotos.zip’: 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 ‘Fotos.zip’: Input/output error
cp: failed to extend ‘/tmp/Fotos.zip’: 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 <john@stoffel.org> 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, algorithm 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