How to make the times of all nodes similar

Hi,
i have a 3 node 10.2.0.4 64Bit Cluster database on
HP Itanium with OS RHEL-4.6.
we donot have any NTP Server integrated with these.
Three nodes are running with three different Time with significant differences.
More over 2 of the Nodes run well ahead of real Actual time and One run behind actual time.
For Example at 11:34 AM the nodes return their times as follows::
HOST_NAME DATETIME
Node-1 11-JUL-2012 11:56:38
HOST_NAME DATETIME
Node-1 11-JUL-2012 11:18:12
HOST_NAME DATETIME
Node-3 11-JUL-2012 11:44:26
the real time difference is 16 Min Minus and 22 Min Plus.
And difference of Times does have an adverse business impact.
if syncronization without NTP is possible -- that would be great.
if not, how can we bring all the server nodes close to the real time.
Your suggestion and workaround will be appreciated to synchronize the times of three instances
as much possible with out hampering the Cluster Services.

onedbguru wrote:
I forget the name of it, but there is an executable that is used in Exadata clusters to do the same thing. Two standerd bash scripts I deploy to all RAC servers are called rac (for running a "RAC command" on all nodes) and raccp (for distributing a local file to all other RAC servers).
Uses ssh and scp and are quite useful. Want to see uptime for example? rac uptime. Want to distribute the updated ntp config? raccp /etc/ntp.conf.
Sadly though - no Exadata. There are 2 Exadata DB Machines in the corporate, but despite having one of the busiest databases on a self-build 12 node 3-yer old RAC, crunching data 24x7 for our corporate clients, no Exadata for us... Kind of like this Dilbert situation - total incompetence and requesting many millions are required.

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