Re: fsck mdadm

On 3/9/26 6:40 AM, Erwan RIGOLLOT wrote:
> Hello all,

Hi,

> md5 : active raid5 sde1[9] sdd1[8] sdg1[5] sdf1[6] sdc1[7]
>        15627542528 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/5] [UUUUU]
> 
> (My problem is about MD5)

It appears as if md5 is happy (enough).

> for i in c d e f g; do /usr/sbin/smartctl -a /dev/sd$i | grep "Serial\|^# 1\|

Try reading 1 MB ~ 1 GB from each of the disks.

for i in c d e f g; do dd if=/dev/sd${i} of=/dev/null bs=1M count=1; done

Raise count to read more than 1 MB from each drive.

I've had some really weird almost silent failures wherein the drive 
would respond to the kernel for anything but data.  Trying to read data, 
especially more than a few (hundred) MB almost certainly exceeds any 
cache and thus forces a read from disk.

If you can really read from the persistent media, then you know that you 
don't have that particular problem.

> So, my five disks seem to be ok.
Were you trying to do an online / mounted or offline / unmounted fsck?

I usually balk at this request, but I'd be remiss if I didn't ask; does 
the problem continue after a reboot?



-- 
Grant. . . .