cache pool free space

[s1oz]

sorry my English is not good..

Create a new cache pool and use raid0 mode

Why is there only 80% free space?

[JorgeB]

Becuase the devices are of different sizes, so the largest one can't be fully used, single mode will use both (but will be slower).

[s1oz]

1 hour ago, JorgeB said:

Becuase the devices are of different sizes, so the largest one can't be fully used, single mode will use both (but will be slower).

Can't raid0 mode use the full capacity?

 

[JorgeB]

No, because raid0 requires that all writes go to at least 2 devices, though I believe this has been/going to be changed in newer kernels, when there's only one device available it starts writing in single mode.

[s1oz]

15 hours ago, JorgeB said:

No, because raid0 requires that all writes go to at least 2 devices, though I believe this has been/going to be changed in newer kernels, when there's only one device available it starts writing in single mode.

Will single mode write a file to two hard drives evenly?

Or is it written to the second disk after the first disk is full?

[JorgeB]

IIRC it will first write to the largest disk and when there's the same space available on both it will alternated from one to the other, in 1GiB chunks, so any file larger than that will use both.