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I have been using AWS spot instances with persistance storage; something along these lines. I have been this successfuly for months with different instance types, and extended my volume several times as i got more data (128gb > 256gb > 512gb).

In my last experiment, I extended my ebs volume to 1TB, ran some batch process on a m4.16xlarge machine, and after one day, the second status check failed (instance reachability check); unfortunetly i don't have the system log for that moment now.

I thought it's a generic failure, and launched a new c4.8xlarge spot instance with the same ebs volume; no errors, ssh successful, data there.

Now i'm trying to create a new m4.16xlarge with the same ebs, but it fails; full server log here. I'm not able to mount the volume with this or any other instance type now.

Do you have ideas what might have wrong and how i can remedy this?

  • I suggest you read the log yourself and put the parts that look relevant into your question. No-one wants to read a massive log. – Tim Sep 19 '17 at 20:14
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The filesystem on your EBS volume is corrupted. Don't ask me how it became that way.

In the log, you'll see the following:

[   14.022730] EXT4-fs (xvdf1): ext4_check_descriptors: Checksum for group 0 failed (8312!=23362)
[   14.029039] EXT4-fs (xvdf1): group descriptors corrupted!
mount: mount /dev/xvdf1 on /permaroot failed: Structure needs cleaning

You'll need to fix your filesystem before trying to mount it again.

After some Googling, I found this, which you can try. But note that I do not warrant it's validity.

http://www.webdesignblog.asia/operating-systems/linux-os/ext4-fs-group-descriptors-corrupted-cannot-mount-disk-using-ubuntu/#sthash.XYgsfq3E.fTLnfoTc.dpbs

  • Thanks Matt, I managed to fix it by: -creating a new instance and attaching the corrupted volume -running sudo fsck /dev/sdf1 (sdf being the device name for the volume) luckily all my working data is there, and all look good! – Md Oliya Sep 20 '17 at 9:53

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