Maunal purge_relay_logs crash my replication about mysql-master-ha HOT 2 OPEN

I m encounter new errors,
when I run below shell command, throw me an error:

/usr/local/bin/purge_relay_logs --user=root --password=123123 
--disable_relay_log_purge >> /data/mysql/data/purge_relay_log.log 2>&1

here was the error message:

2015-03-04 11:17:26: purge_relay_logs script started.
 Found relay_log.info: /data/mysql/data/relay-log.info
 Removing hard linked relay log files twpdb21-relay-bin* under /var/tmp.. done.
 Current relay log file: /data/mysql/data/twpdb21-relay-bin.000074
 Archiving unused relay log files (up to /data/mysql/data/twpdb21-relay-bin.000073) ...
 Creating hard link for /data/mysql/data/twpdb21-relay-bin.000066 under /var/tmp/twpdb21-relay-bin.000066 ..ln: creating hard link `/var/tmp/twpdb21-relay-bin.000066' => `/data/mysql/data/twpdb21-relay-bin.000066': Invalid cross-device link
 at /usr/local/bin/purge_relay_logs line 94
        main::hardlink_relay_logs('twpdb21-relay-bin.000074') called at /usr/local/bin/purge_relay_logs line 209
        eval {...} called at /usr/local/bin/purge_relay_logs line 155
        main::main() called at /usr/local/bin/purge_relay_logs line 68

Can tell me how to fix the issue? thanks

Regards
Garey

Would you set --workdir in a same OS partition as MySQL relay logs (but 
different directory) and see if it works?