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

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

> > > What happened was:
> > > - a device (sdg1) was added as a write-mostly member to a degraded
> > > two-member RAID1 (md3) and started recovering;
> >
> > May I be so frank as to guessing you found an old drive and added as
> > write-mostly? sdg is the bad drive here…
> 
> 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).

This makes perfectly sense, but the HDD obviously isn't good, and perhaps some data were bad on the SSD as well. I'd replace the HDD with something else, perhaps after a badblocks test, and at least with a short SMART test, and rebuild. The errors on the filesystem should be solveable with an fsck. If not, well, I hope you have a good backup…

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roy
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Roy Sigurd Karlsbakk
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