On Fri, 2011-10-21 at 01:20 -0400, Jon Masters wrote:
In case anyone is interested, I have Fedora running on the AC100U
Unlike some of the other hacks I've seen I wanted to actually use the
storage efficiently with device mapper presenting it as a contig. block
device. Unfortunately, some of the block discard support seems to be
tripping that up. If you try an AC100 with dm, make sure you specify "-E
nodiscard" to mkfs.ext4 during filesystem creation.
Separately note that the F15 man page for e2fsprogs says both that
"discard" and "nodiscard" are simultaneously the default :) This was
confusing me. However, the correct default (as also documented in
rawhide) is that discard will generally be attempted.