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Home -> Community -> Mailing Lists -> Oracle-L -> RE: RAC time clocks (sysdate)
<FONT face=Arial color=#0000ff
size=2>Beware, NTP can be a complicated critter to get working in a proper
fashion. The best way to configure your NTP is to have one or two
local stratum 2 or stratum 3 servers that all of your nodes sync off of (a good
choice for these servers are servers that do other low-load internal services
like mail relay or DNS). Those servers should each be configured with two
unique stratum 1 or 2 servers and then set up to peer off of each other.
Then, point your database servers at your stratum 2 servers. If your
servers are too far out of sync with the rest of the world, NTP won't change the
clocks instantaneously, but will gradually "drift" your clocks into sync.
If you want to rush the process, stop the ntpd process, use ntpdate to set the
clock one time, and then restart ntp. The drift should be small enough
that will immediately maintain synchronization.
<FONT face=Arial color=#0000ff
size=2>
The
above config is a little bit over-engineered if you only have a few hosts, but
if you don't already have a global time management system configured, now is the
time (no pun intended) to do it - its one of those things that should be
required for any infrastructure. Properly synchronized time makes things
like auditing, monitoring, and general sanity an order of magnitude
easier. The above system will easily scale to up to a few hundred hosts
and basically insures that the time will be consistent across the infrastructure
as a whole. The other nice thing about NTP is that its an interesting
protocol, for those who care about such things, since it actually makes a
distinct effort to take network latency and so-such into consideration when
setting the time.
<FONT face=Arial color=#0000ff
size=2>
<FONT face=Arial color=#0000ff
size=2>Thanks,
<FONT face=Arial color=#0000ff
size=2>Matt
--Matthew ZitoGridApp SystemsEmail:
[EMAIL PROTECTED]Cell: 646-220-3551Phone: 212-358-8211 x 359<A
href="http://www.gridapp.com/">http://www.gridapp.com
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<FONT
face=Tahoma size=2>-----Original Message-----From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nick
WagnerSent: Thursday, July 10, 2003 1:10 PMTo: Multiple
recipients of list ORACLE-LSubject: RE: RAC time clocks
(sysdate)
<FONT face=Arial color=#0000ff
size=2>thanks!
<FONT face=Tahoma
size=2>-----Original Message-----From: Jamadagni, Rajendra
[mailto:[EMAIL PROTECTED]Sent: Thursday, July 10, 2003
10:40 AMTo: Multiple recipients of list ORACLE-LSubject:
RE: RAC time clocks (sysdate)
Our sysadmins use ntp or something like that .
Raj <FONT
size=2>--------------------------------------------------------------------------------Rajendra dot Jamadagni at nospamespn dot com <FONT size=2>All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !
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