below is the last 20 lines of the mysqld.log if that will help
202:/Users/jono zimbra$ tail -f -n 20 /opt/zimbra/log/mysqld.log
051123 14:01:54 mysqld started
051123 14:01:54 [Warning] Setting lower_case_table_names=2 because file system for /opt/zimbra/db/data/ is case insensitive
051123 14:01:55 [Warning] One can only use the --user switch if running as root
051123 14:01:55 InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
051123 14:01:55 InnoDB: Starting log scan based on checkpoint at
InnoDB: log sequence number 0 30960.
InnoDB: Doing recovery: scanned up to log sequence number 0 30960
051123 14:01:56 InnoDB: Flushing modified pages from the buffer pool...
InnoDB: Doublewrite buffer not found: creating new
InnoDB: Cannot create doublewrite buffer: you must
InnoDB: increase your buffer pool size.
InnoDB: Cannot continue operation.
051123 14:01:56 mysqld ended