Re: md RAID1 passes I/O errors to the filesystem despite having alive mirrors?

[Roy Sigurd Karlsbakk <roy@karlsbakk.net>]

> > This is correct, but I should note that I did not add it as
> > write-mostly just
> > because it's an older drive, but because it is my normal set-up for
> > md3:
> > a RAID1 mirror of a fast SSD (sdf) and a write-mostly HDD (sdg in
> > this case).
> 
> Again, I find it odd that sdg while rebuilding is reading any sectors.
> The read errors are coming from sdg. That it's also write-mostly
> enhances the mystery why sdg is being read from.
> 
> I would fail the HDD, and btrfs scrub the array which in effect should
> scrub only sdf. And it may also need an offline btrfsck. The source
> (sdf) is already suspect because of btrfs not finding checksums where
> it was expecting to find them, and then on top of this you're getting
> sdg producing bad sector errors on reads.

Have you done a SMART check of sdg? smartctl -H first, then smartctl -t short, then smartctl -t long (with smartctl -H between them)

> You might also consider posting the configuration and full dmesg to
> the btrfs list. I'm curious what btrfs developers think of this
> configuration.

It's not btrfs - it's below that.

Vennlige hilsener / Best regards

roy
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Roy Sigurd Karlsbakk
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