Resizing Arrays and LUNs

[JDLangdon]

When we setup our SAN, many moons ago, we decided to create standard arrays of 600GB's and then sub-divided each array into 6x100GB LUN's which were formated as VMFS.

For various reasons I need to rethink this design and would like to delete/remove our 6x100GB LUN's and create a 600GB LUN.

From an ESX perspective, do I need to do anything other the remove the LUN's from within the Virtual Center?

I am under the assumption that simply removing the LUN's (Virtual Center => Configuration => Storage => Remove), creating the new LUN's from within the SAN software, and then rescanning the SAN (Virtual Center => Configuration => Storage Adapters => Rescan), is all that needs to be done in order to pull this off.

Are there any further steps that I need to be concerned about? Data loss is not an issue as I will migrate the VM's prior to removing the LUN's.

Jason

[peetz · Accepted solution]

Hi Jason,

this is the correct way to do it.

However, doing similar storage migrations we found it helpful NOT to

re-scan HBAs from the VI client. This timed out often, messed up

the GUI display, and we did not really know, if the re-scan was successful.

Do the re-scan on the service consoles of the ESX hosts instead with

esxcfg-rescan

\- Andreas

[esiebert7625]

If you will be creating VM's over 256GB you might want to increase your block size from 1MB to 2MB to support larger VM disk files.

[JDLangdon]

Thanks guys.

Points awarded accordingly..

Jason