{"action":"opened","issue":{"url":"https://api.github.com/repos/mirage/mirage-block/issues/2","labels_url":"https://api.github.com/repos/mirage/mirage-block/issues/2/labels{/name}","comments_url":"https://api.github.com/repos/mirage/mirage-block/issues/2/comments","events_url":"https://api.github.com/repos/mirage/mirage-block/issues/2/events","html_url":"https://github.com/mirage/mirage-block/issues/2","id":114095732,"number":2,"title":"Add disk mirroring","user":{"login":"djs55","id":198586,"avatar_url":"https://avatars.githubusercontent.com/u/198586?v=3","gravatar_id":"","url":"https://api.github.com/users/djs55","html_url":"https://github.com/djs55","followers_url":"https://api.github.com/users/djs55/followers","following_url":"https://api.github.com/users/djs55/following{/other_user}","gists_url":"https://api.github.com/users/djs55/gists{/gist_id}","starred_url":"https://api.github.com/users/djs55/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/djs55/subscriptions","organizations_url":"https://api.github.com/users/djs55/orgs","repos_url":"https://api.github.com/users/djs55/repos","events_url":"https://api.github.com/users/djs55/events{/privacy}","received_events_url":"https://api.github.com/users/djs55/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-10-29T16:50:48Z","updated_at":"2015-10-29T16:50:48Z","closed_at":null,"body":"It would be useful to be able to create a disk mirror given a primary and a secondary block device which would\r\n- copy the contents from the primary to the secondary in the background\r\n- safely expose a block device so that writes are guaranteed to hit both primary and secondary before the function returns (but without losing a race with the background copy)"}}