mdb - no space left?

[Frank Swasey <Frank.Swasey@uvm.edu>]

I'm experimenting with mdb to replace hdb on my test/development set of 
servers.  I've built 2.4.32 and the server is running RHEL 6.3.  This 
morning, I got a confusing error.

Attempting to perform a deletion of a member from a groupOfNames, the 
following was recorded in syslog:

 mdb_id2entry_put: mdb_put failed: No space left on device(28) 
"cn=GroupNameNotImportant,ou=groups,dc=uvm,dc=edu"

and ldapmodify returned:

modifying entry "cn=GroupNameNotImportant,ou=Groups,dc=uvm,dc=edu"
ldap_modify: Other (e.g., implementation specific) error (80)
        additional info: entry update failed

However, free shows memory left, df shows filesystem space left (in 
fact, it is only 22% used) and data.mdb is

-rw------- 1 ldap ldap 1547292672 Sep  8 06:22 data.mdb

while the maxsize parameter is set to:

maxsize         85899345920


So, I am confused about which device mdb is telling me is out of space.

What have I missed?

--
Frank Swasey                    | http://www.uvm.edu/~fcs
Sr Systems Administrator        | Always remember: You are UNIQUE,
University of Vermont           |    just like everyone else.
  "I am not young enough to know everything." - Oscar Wilde (1854-1900)