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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 19 Jan 2019
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      Well this is some pathological fail. Turns out XFS can block on I/O when trying to reclaim inode caches. This means that with a machine with gigabytes of free RAM (used for FS caches), busy I/O escalates to massive latency spikes for *everything*, even things that don't do I/O.pic.twitter.com/CtJKhFrKbr

      4 replies 20 retweets 68 likes
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    2. Hector Martin‏ @marcan42 19 Jan 2019
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      I *hope* other filesystems don't do this nonsense. Good thing I'm getting rid of XFS. I used to think it was a good filesystem, but this behavior is reason enough for me to never use it again for anything serious.

      3 replies 0 retweets 14 likes
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    3. Hector Martin‏ @marcan42 19 Jan 2019
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      A simple drop_caches fixes the massive latency spikes on allocation (until the page cache grows to use all free RAM again, of course). This is obviously broken. Ugh.

      2 replies 0 retweets 15 likes
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    4. Glenn D‏ @B1tSmurf 19 Jan 2019
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      Replying to @marcan42

      ZFS, if you care about your data.

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 19 Jan 2019
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      Replying to @B1tSmurf

      I care about my data, so not ZFS. ZFS is great until something goes wrong, then good luck fixing it.

      1 reply 0 retweets 0 likes
    6. Glenn D‏ @B1tSmurf 19 Jan 2019
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      Replying to @marcan42

      I disagree. ZFS has been rock solid for me and withstood multiple disk failures without data loss. Not even ext4 or btrfs can keep up.

      1 reply 0 retweets 0 likes
    7. Hector Martin‏ @marcan42 19 Jan 2019
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      Replying to @B1tSmurf

      I'm not talking about disk failures, I'm talking about something going wrong with ZFS itself. Of course btrfs is worse. ext4 and XFS are better, they can actually be understood and debugged by mere mortals.

      1 reply 0 retweets 1 like
    8. Hector Martin‏ @marcan42 19 Jan 2019
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      Replying to @marcan42 @B1tSmurf

      To wit: I had a SNAFU with RAID6 during some disk exchanges that I ended up fixing, but I wound up with a FS that was a mix of disk state from a span of about 1 hour. XFS happily fixed everything with fsck. ZFS would've probably died badly with such an unconventional issue.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 19 Jan 2019
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      Replying to @marcan42 @B1tSmurf

      The lack of fsck being the first problem, of course. The rule with ZFS is that when something goes wrong, you restore from backup. I *do* have backups, but it don't trust a FS with that mentality.

      5:57 PM - 19 Jan 2019
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        2. Glenn D‏ @B1tSmurf 19 Jan 2019
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          Replying to @marcan42

          I've been running ZFS in critical production for over 6 years and I haven't seen a single file system failure even when disks decided to die.

          1 reply 0 retweets 0 likes
        3. Glenn D‏ @B1tSmurf 19 Jan 2019
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          Replying to @B1tSmurf @marcan42

          On top of that, ZFS don't need fsck.

          1 reply 0 retweets 0 likes
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