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Centos5: nfs clients get premission denied

While working on ny NFS cluster project , I could not mount my nfs exports from clients ( FreBSD & Centos ).
on the FreeBSD client I got these responses :
[udp] server:/data/dir1: Permission denied
on the CentOS client I got these responses:
mount: server:/data/dir1 failed, reason given by server: Permission denied
On the Centos NFS server the logs showed [...]

Setup NTP on CentOS 5.2

I am working on building a DRBD cluster and as with all cluster tools , you must have a synced time between nodes.
1. install ntp
yum -y install ntp
2. enable ntp on boot
chkconfig ntpd on
3.run a manual time sync before starting the service
ntpdate 0.pool.ntp.org
4. start the service
service ntpd start

find whats causing a busy partition in freebsd

trying to umount an nfs or external disk partition and got “partition busy” ?
use fstat -f to find out what the hold up …
-f Restrict examination to files open in the same file systems as
the named file [...]

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