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Special Forums UNIX and Linux Applications Is Virtualisation Right for Colo? Post 302192193 by Karma on Tuesday 6th of May 2008 08:29:29 AM
Old 05-06-2008
Is Virtualisation Right for Colo?

Hi guys

I'm going to be moving a linux box into collocation to support the growing demands of my sites and have been trying to figure out if Xen is right for me. I'd appreciate hearing some real-world experience with the overhead involved and the optimal ways to slice up a box. Right now I feel I should either do an all-in-one setup with a hardened installation, use Xen to virtualise services I would normally run on other machines (such as DNS and SQL) and/or use Xen to rent out VPSes.

My main concern is that I don't have unlimited resources on this box, it's a dual p4-style 3.06GHz xeon with HT and 4 gigs of old ddr. So far I am going to need to accommodate the following:
- about 100,000 script-generated page views a day, with room for spikes, floods and other attacks
- dns services for about 30 domains, only three well traveled
- sql
- mail

Is Xen practical for my situation? I'm intrigued by the ability to replace and migrate virtual servers in a snap but not sure if the performance cost makes it more effective than a traditional solution. Any input is appreciated!
 

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GENLIB_COPY_UP_CON.3(October 1, 1997)									     GENLIB_COPY_UP_CON.3(October 1, 1997)

NAME
GENLIB_COPY_UP_CON - copy a physical connector from an instance in the current figure SYNOPSYS
#include <genlib.h> void GENLIB_COPY_UP_CON(index, conname, insname, newname) long index; char *insname; char *conname; char *newname; ORIGIN
This software belongs to the ALLIANCE CAD SYSTEM developed by the ASIM team at LIP6 laboratory of Universite Pierre et Marie CURIE, in Paris, France. Web : http://asim.lip6.fr/recherche/alliance/ E-mail : alliance-users@asim.lip6.fr PARAMETERS
index Connector index in the instance conname Name of the connector in the instance model insname Name of the instance the connector belongs to newname Name to be given to the connector in the current figure DESCRIPTION
COPY_UP_CON copies a instance connector into the current layout figure, and gives to the new connector the name newname. The instance con- nector is identified by its name, conname, and index, index. Two behaviour are expected, depending on the instance connector location regarding the abutment box of the current figure. Connector on the abutment box The figure connector is place right over the instance connector. The single connector is duplicated. Connector inside the abutment box The instance connector face is computed in the figure, and then, the connector is duplicated on the given face, at the right coordinates for this face. Then a wire is drawn between the instance connector and the figure connector in the connector layer. If newname is NULL, then not connector is copied up, on the segment is drawn to the side of the abutment box. ERRORS
"GENLIB_COPY_UP_CON impossible : missing GENLIB_DEF_PHFIG" No figure has been yet specified by a call to DEF_PHFIG. So it isn't possible to place a connector inside it. you must call DEF_PHFIG before any other layout action. "*** genlib error *** GENLIB_COPY_UP_CON impossible : connector conname index index of instance insname, current figure doesn't exist" The given connector does not exist in the current figure. EXAMPLE
#include <genlib.h> main() { /* Create a figure to work on */ GENLIB_DEF_PHFIG("cell"); . . GENLIB_PLACE_LEFT("gaer0_f", "insN", SYMXY); . . GENLIB_DEF_AB(0L, 0L, 0L, 0L); /* Put a connector */ GENLIB_COPY_UP_CON("i0", 1, "insN", "inz0"); /* Save that on disk */ GENLIB_SAVE_PHFIG(); } SEE ALSO
genlib(1), GENLIB_DEF_PHFIG(3), GENLIB_SAVE_PHFIG(3), GENLIB_COPY_UP_ALL_CON(3), GENLIB_COPY_UP_CON_FACE(3), GENLIB_PHCON(3), GEN- LIB_THRU_CON_H(3), GENLIB_THRU_CON_V(3). BUG REPORT
This tool is under development at the ASIM department of the LIP6 laboratory. We need your feedback to improve documentation and tools. PROCEDURAL GENERATION LANGUAGE
ASIM/LIP6 GENLIB_COPY_UP_CON.3(October 1, 1997)
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