Optimizing XenServers and Hosts

I found this useful post about doing some optimizations for your Xen hosts and guests:

Link

Unfortunately, I had some trouble finding where to make the mods on the host.  The location you will need is /boot/extlinux.conf.  I think this may be the RedHat location...

Also, these lines are very long, and if you edit them with nano, for instance, you may screw up the file.  I did this once, and the machine would no longer boot.  You have been warned.  So use vi.  (Weren't you always looking for a good excuse to learn vi?)

I just added the kernel param to the 'xe' section.

Can't update XenServer

I tried using a DVD to upgrade some of my XenServers from 5.6 to 5.6SP2.  I got an error that there were no installations found that could be upgraded.  The solution to this was to apply the update from XenCenter.  It appears some updates have to be applied from XenCenter; some updates have to be applied from an DVD or ISO.  If one doesn't work, then try the other.

XenCenter blank concole screens, and stats not updating

For me this problem was related to some cache files.

I just saw the suggestion in this thread about clearing the cache....and it worked!

http://forums.citrix.com/thread.jspa?threadID=154046&tstart=0


in short:

Stop XenCenter

run %AppData%\Citrix

delete everything there.

Start XenCenter
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I also couldn't install updates until I cleared the cache...