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RobbieH

Simple Question

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Sorry I haven't been using DrivePool for a while and now I can't remember how to do the simplest of things.

I have two 4TB drives that I want to be the primary drives with no redundancy between them. Then I have an 8TB drive that I want to be the redundant drive for both of the 4TB. I can't remember how to set up the balancer for this situation. I seem to remember it being pretty easy, but poking around I can't find it.

Was it possibly done through the use of the SSD Optimizer plug-in? (I don't think that's it...)

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4 hours ago, RobbieH said:

Sorry I haven't been using DrivePool for a while and now I can't remember how to do the simplest of things.

I have two 4TB drives that I want to be the primary drives with no redundancy between them. Then I have an 8TB drive that I want to be the redundant drive for both of the 4TB. I can't remember how to set up the balancer for this situation. I seem to remember it being pretty easy, but poking around I can't find it.

Was it possibly done through the use of the SSD Optimizer plug-in? (I don't think that's it...)

Simple answer is, you don't. 

The best way to do this would be be to add the 2x4TB drives to a pool, and then add that pool and the 8TB disk to another pool.  Enable redundancy on the top level pool.  

That would get you what you want. 

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You could force this behavior with file placement options (certain folders only on disks A + C, others only on B + C.)

I think the duplication space optimizer should more or less achieve what you want by default, however.

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The duplication optimizer on its own will duplicate across all three disks.

So this is for a Plex server. I have two 4TB WD Red drives that are my main "write to" drives. I don't want to write primarily to the third drive.

Let's say the main drives are Drive A and Drive B. I don't want them to duplicate from A > B or B > A. I have a shingled 8TB drive that I want to be the redundant data drive. So I want A > C and B > C but not C > A or B, and again not A > B or B > A. Think of it as C is the redundancy, so only redundant data to C, but reads available from A, B, or C

I can't use data types (mkv, m4v) because those should be going to A and B both.

I had it set up like this on the older server, but I can't remember how I did it.

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That sounds like a plan. Hadn't thought of that. Certainly not how I was doing it before, but maybe what I was doing before did not really work. :)

Thanks!

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Yeah, so now you have

Drive A + B = Pool X (with x1 duplication)

Pool X + Drive C = Pool Y (with x2 duplication)

You can choose to store files in Pool X (and then they will not be duplicated and present on Drive A and B )

Or store them in Pool Y (and then they will be duplicated and present on Drive A/B for one instance and Drive C for the other instance).

So you need to move the files from Pool X to Pool Y.

The best way to do this is to "seed" them. You would:
1. Stop the DrivePool service
2. In drive A, locate the hidden Poolpart.* folder. The top level shows (part of) Pool X. Locate the hidden PoolPart.* folder within the first, that is (part of) Pool Y. Move files from the outer/first Poolpart.* folder to the inner/second PoolPart.* folder
3. Do the same for drive B
4. Start DrivePool service.

DP will now, for Pool Y, find a shitload of unduplicated files and start a duplication run, in this case copying such files from drives A/B to drive C.
 

Not sure what OS you use but you may need to keep in mind that shares do not automatically follow (i.e. in WSE2016 I would move ServerFolders through the WSE2016 dashboard, even if that takes a long time).

As an aside, I would actually create three Pools. Pool X = Drives A/B, Pool Y = drive C and Pool Z = Pool X and Pool Y. I think it makes it easier to manage when adding/replacing drives. Only Pool Y would have x2 duplication. The procedure above still holds.

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