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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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vxsplitlines(1M)														  vxsplitlines(1M)

NAME
vxsplitlines - show disks with conflicting configuration copies in a cluster SYNOPSIS
vxsplitlines [-g diskgroup] [-c daname] DESCRIPTION
If you import portions of a disk group on different systems, this can lead to conflicting configuration copies on the disks of the disk group. If the configuration information in a disk group is ambiguous, it may not be possible for Veritas Volume Manager to determine which config- uration copy is most up-to-date. (This is usually termed a serial split brain (SSB) condition when it occurs in a cluster.) You cannot import a disk group in this state unless you specify which disk's configuration copy to use. You can use the vxsplitlines command to see which disks in a disk group have conflicting configuration copies, and use this information together with your knowledge of the history of the disk groups' usage to determine which configuration copy is most valid. The output from vxsplitlines displays the vxdg commands that you can run to import the disk group using the available configuration copies. The -o selectcp option of the vxdg import command is used to select the configuration copy to use for the import. OPTIONS
-c daname Display the SSB IDs for each disk that are stored in the configuration copy on the disk specified by its disk access name. Note: Although the SSB IDs for some disks may match, this does not necessarily mean that those disks' configuration copies have recorded all the configuration changes. When viewed from some other configuration copies, the SSB IDs of the same disks may not match. -g diskgroup Specifies the disk group. If a disk group is not specified, the default disk group is used as determined from the rules on the vxdg(1M) manual page. EXAMPLES
Display the disks on each side of the split in the disk group newdg: vxsplitlines -g newdg Display the SSB IDs stored in the configuration copy on disk c2t4d0: vxsplitlines -g newdg -c c2t4d0 NOTES
The vxsplitlines is primarily intended to be used with private disk groups, but it also works with shared disk groups. The version number of the disk group must be 110 or greater. SEE ALSO
vxdg(1M) Veritas Volume Manager Administrator's Guide VxVM 5.0.31.1 24 Mar 2008 vxsplitlines(1M)
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