How to increase the Logging Level of NFSD

NFS Server logging is by default very good, but in case you need more logging for deeper inspection you can use :

echo 32767 > /proc/sys/sunrpc/nfsd_debug 

echo 32767 > /proc/sys/sunrpc/rpc_debug 

And for the client side use :

echo 32767 > /proc/sys/sunrpc/nfs_debug

In order to return back to old debugging level use :

echo 0 > /proc/sys/sunrpc/nfsd_debug

echo 0 > /proc/sys/sunrpc/rpc_debug

echo 0 > /proc/sys/sunrpc/nfs_debug 

Master Certificate in Experts-Exchange

I really find Experts-Exchange a great way of challenging yourself for different problems then you have in your daily job. As I contribute in various areas, I could finally got enough points to get Master Certificate. Next target is Guru ;-)

How to Rescan SCSI Bus in Linux

I have a RHEL5 lab on my laptop, that's hosted on Vmware 7. For my RHCE prep I usually add/remove disks while the VM is up and running (hot swap). In order to make Redhat recognize the new disk you need to trigger the rescan of the SCSI bus :

echo “- - -” > /sys/class/scsi_host/hostX/scan

instead of hostX use the HBA ID. It's host0 in my case. Immediately after you can see the new disk on "fdisk -l"


NOTE : This works on 2.6 kernel only.