Thread (11 messages) 11 messages, 3 authors, 2013-03-17

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

From: Roy Sigurd Karlsbakk <hidden>
Date: 2013-03-15 12:32:13

quoted
quoted
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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