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The light inside is broken, but I still work. The Cadillac of online bookmarking sites. Alleged nocoiner. http://pinboard.in  maciej@ceglowski.com +1 415 610 0231

Lonely street of broken dreams
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    1. Pinboard‏ @Pinboard Jan 24

      By the way if anyone has clever ideas about how to move 80TB of data more virtually, or wants an exciting unpaid internship at Pinboard ops, I'm all ears. Last time I did a full off-site backup I was chased out of California by fire, this time by ice.

      11 replies 4 retweets 67 likes
      Show this thread
    2. Luke‏ @Luke_s_Crawford Jan 24
      Replying to @Pinboard

      depends entirely on what part of the system it is hard to change. If your database/datastore doesn't have a replication option that is easy, I'd look at putting your primary local backups on a server with zfs, and pushing incrementals to the remote with zfs send

      1 reply 0 retweets 1 like
    3. Luke‏ @Luke_s_Crawford Jan 24
      Replying to @Luke_s_Crawford @Pinboard

      Easy to script, easy to send just the changed blocks for the day. zfs send can be tunneled over ssh, too, so setup and authentication is also easy. I mean, the only gotcha is that a snapshot is like yanking one drive out of a mirror and using that for your backup

      1 reply 0 retweets 1 like
    4. Luke‏ @Luke_s_Crawford Jan 24
      Replying to @Luke_s_Crawford @Pinboard

      it doesn't by default quiesce anything. but you could put a 'flush tables with read lock..' or whatever your equivalent is before taking the snapshot. Also, if you are backing up from your local backup disk to a remote backup disk, this isn't an issue.

      1 reply 0 retweets 1 like
    5. Luke‏ @Luke_s_Crawford Jan 24
      Replying to @Luke_s_Crawford @Pinboard

      It's better than just rsync 'cause it doesn't need to touch every file; it just looks at changed blocks, so it's usually way faster, and causes way less disk read load vs. rsync.

      1 reply 0 retweets 1 like
    6. Pinboard‏ @Pinboard Jan 24
      Replying to @Luke_s_Crawford

      The really big backups I do (the ones I have to drive around) are of archived web pages, not database anything. Just a few thousand tgz files per user

      2 replies 0 retweets 1 like
    7. Luke‏ @Luke_s_Crawford Jan 24
      Replying to @Pinboard

      well, I mean, how much do they change every day? that's the idea; you maybe drive the first run, but then you have a daily replication that only moves over the changes. I mean, in the simple case, that's just you drive the data to get it started, then have a nightly rsync.

      1 reply 0 retweets 0 likes
    8. Luke‏ @Luke_s_Crawford Jan 24
      Replying to @Luke_s_Crawford @Pinboard

      rsync has a per-file overhead (you can lower that overhead by setting it to only checksum the files with timestamps that have changed, then it's just a stat per file that hasn't changed) That is probably the most your style.

      1 reply 0 retweets 0 likes
    9. Luke‏ @Luke_s_Crawford Jan 24
      Replying to @Luke_s_Crawford @Pinboard

      (note, for the files with newer timestamps, it does a checksum of the file on both ends, which eats a lot of disk bandwidth but not very much network bandwidth if the files are the same data.)

      1 reply 0 retweets 0 likes
    10. Luke‏ @Luke_s_Crawford Jan 24
      Replying to @Luke_s_Crawford @Pinboard

      rsync also has a handy option to limit throughput, so... like if you don't want to drive the first run, you just set --bwlimit= to something small enough it doesn't hurt you and... I mean 80TiB just isn't what it used to be. even if you limit it to 10mbps, that's like a day.

      2 replies 0 retweets 0 likes
      Pinboard‏ @Pinboard Jan 24
      Replying to @Luke_s_Crawford

      Yeah, rsync and I are besties. And I'm going to try your approach now that I have uncapped residential internet. But I think it takes ten days to transfer a terabyte at 10Mbps, not one day

      11:14 PM - 24 Jan 2021
      0 replies 0 retweets 0 likes

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