On Mar 9, 2011, at 8:44 AM, John Hodrien <J.H.Hodrien@xxxxxxxxxxx> wrote:
> On Wed, 9 Mar 2011, Ross Walker wrote:
>
>> On Mar 8, 2011, at 12:02 PM, John Hodrien <J.H.Hodrien@xxxxxxxxxxx> 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
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