How to Migrate from Single Disk to Many? (RHEL 4.6) Post: 302363346

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Operating Systems Linux Red Hat How to Migrate from Single Disk to Many? (RHEL 4.6) Post 302363346 by home4ktt on Tuesday 20th of October 2009 05:22:08 AM

10-20-2009

Registered User

How to Migrate from Single Disk to Many? (RHEL 4.6)

I have a Red Hat Enterprise 4.6 virtual server built on 1 virtual disk running Oracle Applications on VMware ESX 3.5; the performance of the virtual server is not good because of IO bottlenecks. The ESX server is reporting minimal load, it's the virtual server which is struggling with disk IO because everything is on the one virtual disk.

I can create almost any number of virtual disks to spread the load across but I don't know what the best number and arrangement of disks would be or how to migrate the existing system off the original disk (which is too big and I plan to trash) and onto the new disk arrangement.

I have found out how to move the swap space onto a new disk using 'parted' and 'mkswap'. I tried it on a test system; I don't want to touch the live system until I am very clear about what I am going to do.

I was thinking about having a single new disk with three partitions for "/boot" (100MB), swap space (2GB) and a data backup area (xxMB). And then three (or more?) disks in stripe formation (using LVM) for performance (no fault tolerance required as the virtual disks would be on a RAID5 SAN) to put the main application on with another three-disk stripe for the Oracle database.

Unless I am forced into it, I don't want to create any additional servers to spread the load across. I just want to get better IO performance from the single server that I already have.

Any suggestions regarding the plan?
Remember I can create almost any disk arrangement I need (which is nice).
So what's going to give me the best performance?

And how do I actually migrate everything off the original disk?

Thanks for your suggestions and help.

home4ktt

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list-virtual-servers

asadmin-list-virtual-servers(1AS)				   User Commands				 asadmin-list-virtual-servers(1AS)

NAME

       asadmin-list-virtual-servers, list-virtual-servers - gets the virtual servers

SYNOPSIS

       list-virtual-servers --user admin_user [--password admin_password] [--host localhost] [--port 4848] [--secure|-s] [--passwordfile filename]
       [--terse=false] [--echo=false] [--interactive=true]

       Gets all the virtual server elements. This command is supported in remote mode only.

OPTIONS

       --user		       authorized domain application server administrative username.

       --password	       password to administer the domain application server.

       --host		       machine name where the domain application server is running.

       --port		       port number of the domain application server listening for administration requests.

       --secure 	       if true, uses SSL/TLS to communicate with the domain application server.

       --passwordfile	       file containing the domain application server password.

       --terse		       indicates that any output data must be very concise, typically avoiding human-friendly sentences and favoring well-
			       formatted data for consumption by a script. Default is false.

       --echo		       setting to true will echo the command line statement on the standard output. Default is false.

       --interactive	       if set to true (default), only the required password options are prompted.

       Example 1: Using list-virtual-servers

       asadmin> list-virtual-servers --user admin --password adminadmin
       --host localhost --port 4848
       Command list-virtual-servers executed successfully

EXIT STATUS

       0		       command executed successfully

       1		       error in executing the command

       asadmin-create-virtual-server(1AS), asadmin-delete-virtual-server(1AS)

J2EE 1.4 SDK							    March 2004					 asadmin-list-virtual-servers(1AS)