[CentOS] connection speeds between nodes

[Ross Walker]

On Mar 9, 2011, at 8:44 AM, John Hodrien <J.H.Hodrien at leeds.ac.uk> wrote:

> On Wed, 9 Mar 2011, Ross Walker wrote:
> 
>> On Mar 8, 2011, at 12:02 PM, John Hodrien <J.H.Hodrien at leeds.ac.uk> wrote:
>> 
>>> The absolute definiton of safe here is quite important.  In the event of a
>>> power loss, and a failure of the UPS, quite possibly also followed by a
>>> failure of the RAID battery you'll get data loss, as some writes won't be
>>> committed to disk despite the client thinking they are.
>> 
>> Don't forget about kernel panics and the accidentally pulled the plugs...
> 
> Sure, but the kernel's always in a position to screw you over.  While you're
> being negative, include bad memory on the RAID card, and then your life
> becomes really interesting.

Life is full of risks one of course has to prioritize these from likely to unlikely and determine if mitigation of the likely risks is necessary. I have personally experienced kernel panics after a kernel upgrade, so I put that as likely, but have yet to experience RAID write-back corruption, so I put that as unlikely, but you never know.

-Ross