cpio to ext4 seems much slower than to ext2, ext3 or xfs

[Roberto Ragusa]

Ric Wheeler wrote:
> In our testing with f12, I build a 60TB ext4 file system with 1 billion
> small files. A forced fsck of ext4 finished in 2.5 hours give or take a
> bit :-) The fill was artificial and the file system was not aged, so
> real world results will probably be slower.
> 
> fsck time scales mostly with the number of allocated files in my
> experience. Allocated blocks (fewer very large files) are quite quick.
> 

What kind of machine did you use?

With 60TB a simple allocation bitmap for 4k-blocks takes almost 2GB;
and this is just to detect free space or double allocation of blocks.
Wow.

-- 
   Roberto Ragusa    mail at robertoragusa.it