Andreas Dilger wrote:
It is possible to specify the RAID stride to mke2fs allow it to optimize the layout of the bitmaps. With the new mballoc it is also possible to tell it via a mount option to do large allocations aligned on the RAID stride (by default it aligns on 1MB boundaries from the start of the LUN). What would be rather convenient is to store the RAID stride value in the superblock. That would spare a lot of hassle on the part of the admin to tune the filesystem optimally for the underlying storage. There is also a library used in the XFS tools that knows how to probe various kinds of block devices (e.g. MD RAID, LVM/DM, etc) to get their storage layout that would avoid the need for the user to specify anything. Any thoughts on this?
I think it sounds great. I think ext4 would benefit greatly from knowing a bit more about the underlying device geometry & allocating accordingly...
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