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sunhux

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any consequence if use vCenter's hosts entries 1st during ESXi hosts setup & later create DNS FQDN entry record

My vendors are here setting up 5x ESXi hosts for me but they just
requested for FQDN (fully qualified domain names) to be registered
first for these 5 ESXi hosts in the DNS.

However, it will take 2 weeks for the Change Request to be approved
 to create the 5 servers' DNS entries / records.

In the meanwhile, to get the job started, can I just define these 5
servers in the vCenter (or vSphere's ) hosts file first, & once the
DNS entries have been created, we'll remove from hosts file?

I was told by vendor that using hosts file may cause intermittent
instability & corrupt the vCentre subsequently & may require the
whole vCentre to be reinstalled.  Vendor said he has also seen
the ESXi hosts may face intermittent disconnects from LAN/storage
when we migrate from hosts to DNS subsequently.  They said it's
best practice to start with FQDN using DNS entries from the start
& not switch from hosts to DNS.  Are these claims true ??
We're using Windows 2000/2008 DNS
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sunhux

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Honestly, I have quite a lengthy debate with this 'preferred' vendor:
I being ESXi/VMware illiterate (but I know from the days I support
Solaris, I've created local entries in /etc/hosts & later moved on to
use DNS entries after removing /etc/hosts), I did not face any issue.


>In previous versions FQDN was critical for HA operations but for vSphere 5.0 the HA
>software has been recreated from scratch and doesn't use FQDN entries.  This was
>case with most DNS issues from ESX 3 to ESX 4.1
I suppose the vendor ran into the above issue with HA & DRS failover
& possibly anti-affinity rules?  So can I safely say for vSphere 5.0, if I
use hosts entries in vCenter 1st & when the Change Request is
approved 10 days later, I can safely replace them with DNS entries??

The 2 vendor engrs are VCP & they retorted that I'm no VCP.

Q3:
one more question:
if I don't use VLAN tagging currently but at a later stage enabled
VLAN tagging, is this just a small effort or it involves a major
effort (like reinstalling the entire ESXi ? )
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