[OpenIndiana-discuss] Case sensitivity "mixed" vs "sensitive"

[Cal Sawyer]

Hello

Our 151a8 server is an rsnapshot collector using rsync.  Since setting 
it up a few weeks ago, i've been noting flurries of file creation errors 
in the sync logs. It's taken days to figure this out owing to the large 
amounts of data we're transferring, but it's boiling down to case 
sensitivity

I created the dataset with the default setting; 
"casesensitivity=sensitive".  For reasons i don't understand this 
results in a dataset that, for directories, is case insensitive

eg:  *on the local filesytem*

# touch a
# touch A
(ok, so far so good ...)

# mkdir b
# mkdir B
mkdir: cannot create directory `B': File exists

I created a new dataset with casesensitivity=mixed and this doesn't 
occur.  Case sensitivity is correctly preserved for files, dirs and links

Q:  Why is "sensitive" insensitive for directories?

thanks

- cal