Linux Software RAID: How to fsck on hard drive?

Question

We have a Linux server running with Software RAID1. We see some issues in /var/log/messages like: unreadable sector. I want to perform a complete fsck on the drive to get some more information, but a fsck /dev/md0 brings a clean due to the Software RAID layer in between. How can I check the real hard drive? Do I need to disassemble the whole RAID? How do I deal with the inconsistency in the partition due to the additional Software RAID header?

Does anyone have a good idea for this?

Sven · Accepted Answer · 2012-09-19T09:11:09.200

2

fsck tests the filesystem, but this should be fine as long as the RAID hasn't failed completely.

To test the disk itself, use badblocks (in package e2fsprogs).

badblocks /dev/sda

edited Sep 19 '12 at 09:11

answered Sep 19 '12 at 08:59

Sven

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It's ok to use `badblocks` without `-n` or `-w` on online filesystem, since it doesnt' do any writing. Changing any data on disk doesn't affect badblocks behaviour. – DukeLion Sep 19 '12 at 09:05
Yes, you are right, I misinterpreted the `-n` option. – Sven Sep 19 '12 at 09:08
Recommend use arg `-s` to show progress – DarckBlezzer Feb 08 '23 at 20:31

Linux Software RAID: How to fsck on hard drive?

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