Allow different starting block for CACHE
I've been able to reproduce on multiple machines with multiple samsung ssd's that the limitation of the starting block at 64 causes issues with the 840 and 850 (possibly 860) samsung SSD's. They have a non-standard NAND Erase block size of 1536k instead of 1024k. It causes poor performance with uneven write speeds to the drives.
Please allow us to set the starting block size for the BTRFS pool drives when building.
Thanks!
@limetech just for reference, I was able to reproduce the same issue with multiple Samsung SSD's and there is a thread where others had the same issue back in 2017 when using samsung's in their cache pools.
Since removing my samsung from the pool and swapping to XFS; my machine is working like a boss with no issues whatsoever... details showing the samsung write issues were in this other thread:
If you start reading this post:
and read down a few more posts, yo