[CentOS] Boot speed

Tue May 3 16:01:37 UTC 2011
Les Mikesell <lesmikesell at gmail.com>

On 5/3/2011 9:42 AM, m.roth at 5-cent.us wrote:
>> If you've got one nic, it'a a pretty sure bet that any detection order
>> is going to call it eth0.  Add a few more and I think you'll change your
>> opinion, especially with that headless situation where all you can do is
>> move wires until ssh works.  That's extra fun when you on the phone and
>> paying by the hour for remote support.
> *shrug* I don't have a lot of systems with more than one NIC, but I can
> always do ethtool eth<whatever>  till I see a link detected - that's a
> matter of a minute or two, unless you've got a *lot* of ports.

We typically have at least 2 active, some with 4 or 5, and the machines 
mostly come with broadcomm NICs on the motherboard which we ignore and 
add Intel server cards.  So there are always 4 to 8 possibilities and 2 
to 5 connected wires with link up and the intel cards have an 
approximately random chance of starting at eth0 or eth2.  We have 
machines at several locations and like to ship preconfigured disks to 
meet them, but it doesn't work very well.  If we only used one OS I 
suppose it would be worth building some specialized infrastructure to 
support it's quirks, but it would be nicer if it just did something 
predictable.  At least most of them go to our larger data centers where 
we have our own operators present to configure the addresses.  These 
machines generally aren't rebooted for many months at a time and are in 
load balanced groups so it doesn't matter how long it takes.

   Les Mikesell
     lesmikesell at gmail.com