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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
Old 10-20-2009
Lightbulb 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.
 

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volreattach(8)						      System Manager's Manual						    volreattach(8)

NAME
volreattach - Reattaches disk drives that have once again become accessible SYNOPSIS
/usr/sbin/volreattach [-rb] [accessname...] /usr/sbin/volreattach -c accessname OPTIONS
The volreattach utility has the following options: Calls the volrecover utility to attempt to recover stale plexes of any volumes on the failed disk. Performs the reattach operation in the background. Checks whether a reattach is possible. No operation is performed, but the name of the disk group and disk media name at which the disk can be reattached is displayed. DESCRIPTION
The volreattach utility attempts to reattach disks using the same disk group and media names they had before detachment. This operation may be necessary if a disk has a transient failure, or if some disk drivers are unloaded or unloadable when the Logical Storage Manager is started, causing disks to enter the failed state. If the problem is fixed, the volreattach command can be used to reattach the disks without plexes being flagged as stale, as long as the reattach happens before any volumes on the disk are started. The volreattach command is called from the voldiskadm menus as part of disk recovery. The volreattach utility tries to find a disk with a disk group and disk ID matching that of the disk(s) being reattached. If the matching disk is found, the reattach operation may still fail if the original cause (or some other cause) for the disk failure still exists. EXIT CODES
A zero exit status is returned if it is possible to perform a reattach. Otherwise, non-zero is returned. SEE ALSO
volintro(8), voldiskadm(8), volrecover(8) volreattach(8)
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