Fix #563: How to keep data and cache on external drive

[dashohoxha]

Fix #563
Replaces #565

[jorgeorpinel]

I haven't done an extensive check but just looking at the first file in my first commit, lines 40-43 (abd2446#diff-278c4173e3a65d532906f6a613dc7ce0R40-R43) for example are not included in this PR.

I guess there was a reason to so it, but having closed the original PR and opened a new one from a different branch makes it extra time consuming to track and review the continuity in these changes. I tried just doing git cherry-pick to apply my work again, but since the file is located somewhere else, this method does not work.

We'll probably have to manually compare and reapply my changes (combined here: 482e1c7...f345245) vs those in this PR.

[jorgeorpinel]

Overall, a great article, I would just rename the file to something shorter.

[shcheklein]

The biggest concern is that I don't understand the motivation for this combination. It's very very specific one of the few ways organizing this. Why do we pick and when do we pick this one it's not clear.

[dashohoxha]

I changed the title and rewrote the motivation. I hope it looks better now.

I was tempted again to remove the reference about Windows (https://github.com/iterative/dvc.org/pull/732/files#diff-e67a9ecb076e21d068e0f5559ed64582R30) but I didn't dare. @jorgeorpinel it really seems out of place to me, please think about removing it again.

[shcheklein]

btw, @dashohoxha how does this one correlate with the new data sharing section?

[dashohoxha]

how does this one correlate with the new data sharing section?

I don't see any correlation.
Maybe there is some correlation with the external data management (it could be an example of it), but I think that it deserves to be a standalone HowTo.

[shcheklein]

I think this is not right to provide chown, chmod and other commands to manage permissions. They are not actionable anyway. Exact commands you need to run depend on the case. Some general suggestions to check the permissions should be enough?

[shcheklein]

not sure how is it related to being able to search code tbh, could you elaborate?

[shcheklein]

it's a a very tricky case - if multiple projects use the same data how do they switch different versions?

[shcheklein]

I don't see how does it replace #565 or fixes #563. It's a very specific how-to focused on external dependencies and output on a local machine. Also, it reminds me a lot some of the other data managements sections you put together.

[shcheklein]

closing this as stale