I think I have just been a t**t.
I have a mixture of ESX 4.0 U1 and ESXi 3.5 servers running of an iSCSI SAN (Dell Equallogic). Most of my VMs are installed on four 1 TB LUNS.
Just as a test I decided to increase the size of one of the LUNS to 1.5 TB and then using vCentre 4 expanded the VMFS partition to fill the extra space. This all worked fine.
However ... I just did a "Scan for new VMFS Volumes" on one of the ESXi 3.5 servers and it can no longer see the expanded volumes. It still sees the LUN but the volume doesn't apear in any browse lists. Interestingly the VMs installed on this volume are still operational although they can't be migrated.
I also noticed that the other ESXi 3.5 machines still see the volume but recognise it as only 1 TB. The ESX 4.0 U1 machines see it as 1.5 TB. I won't be doing a storage scan on these any time soon ...
Does ESXi 3.5 have a limit on the maximum size of the volume or have I converted it into a format that is no longer fully recognisble by ESXi 3.5.
Any thoughts or comments would be appreciated.
