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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 25 Sep 2018
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      Why do I always get the weirdest bugs? By my calculation, this one has a 0.03% chance of hitting. https://bugzilla.redhat.com/show_bug.cgi?id=1632590 …

      4 replies 1 retweet 23 likes
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    3. Hector Martin‏ @marcan42 25 Sep 2018
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      Replying to @yukkuriyankey

      It's not a Ceph bug; I've actually never had a bad Ceph bug so far. It's just a libvirt bug/bad default that happens to be triggered more easily by using Ceph.

      0 replies 0 retweets 0 likes
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    5. Hector Martin‏ @marcan42 25 Sep 2018
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      Replying to @yukkuriyankey

      Honestly, that PM is mostly a story of a bunch of admin errors plus one or two Ceph bugs. No data was lost. I'm not going to criticize the admins since they're unpaid volunteers and we all learn from mistakes, but I'm having a much better time running my Ceph clusters.

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 25 Sep 2018
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      Replying to @marcan42

      The worst Ceph story I have to share (impact-wise) was just last week, when I did a full (intended to be) hitless reinstall on a production cluster (Ceph+OS upgrade and full OSD reformat into BlueStore) and a VM server was running an old, buggy version of librbd.

      1 reply 0 retweets 0 likes
    7. Hector Martin‏ @marcan42 25 Sep 2018
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      Replying to @marcan42

      I consider it my screwup, because I forgot that I had upgraded one VM cluster recently but the other one was still running year-old software. A quick VM restart fixed it, total downtime was ~15 minutes. Then I hitlessly updated the VM servers using live migration.

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 25 Sep 2018
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      Replying to @marcan42

      Other services using the cluster weren't impacted at all, which is pretty impressive when you consider I was doing a full rolling disk format and OS reinstall on every OSD in the Ceph cluster.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 25 Sep 2018
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      But yes, we have backups. We cross-backup between two Ceph clusters (and don't update them at the same time).

      9:48 PM - 25 Sep 2018
      0 replies 0 retweets 0 likes

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