The State of ZFS on Linux

Re:The State of ZFS on Linux by ryao on Thursday September 11, 2014 @10:27AM (#8302736)

1. I am not aware of this specific issue. However, I am aware of an issue involving slow pool import with large numbers of zvols. Delphix has developed a fix for it that implements prefix. It should be merged into various Open ZFS platforms soon. It could resolve the problem that you describe.

2. Matthew Ahrens' synctask rewrite fixed this in Open ZFS. It took a while for the fix to propagate to tagged releases, but all Open ZFS platforms should now have it. ZoL gained it with the 0.6.3 release. Here is a link to a page with links to the commits that added this to each platform as well as the months in which the were added:

http://open-zfs.org/wiki/Features#synctask_rewrite

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Re:The State of ZFS on Linux by ownedthx on Thursday September 11, 2014 @06:01PM (#8305430)

Thanks for the reply.

Regarding #2: On OpenIndiana, we first started with concurrent zfs commands and ruin, I think, the whole pool (maybe it wasn't that drastic, but was still a disaster scenario where key data would be lost). I couldn't believe it.

I was asking anyone who knew anything... 'so if two admins were logged in at the same time and made two zvols, they could basically ruin their filesystem'? No one knew for sure. Crazy stuff.

Anyway, I'm quite glad that's safe now.

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