[Lustre-discuss] failure rates

[John White]

On Apr 24, 2009, at 9:59 AM, Brian J. Murrell wrote:

> On Fri, 2009-04-24 at 09:48 -0700, John White wrote:
>>
>> 	I wonder if anyone has any failure metrics on their specific
>> installations.  We're quite new to the lustre space and wanted to get
>> a feel for what we might be in for downtime-wise.  In particular,  
>> does
>> anyone have numbers for the mean time between failure and mean time  
>> to
>> repair?
>
> I think this is a very subjective question.  To a great deal it's  
> going
> to depend on how much you spend on your infrastructure.  If you buy
> cheap(ly built) hardware, it will most likely fail more often than
> better built hardware.

Oh, naturally.  I suppose I was short on details.  The question is  
more geared at the software side of things.  Of course you can build  
in hardware redundancy on the back-end, set up failover on the server- 
end, etc.  Beyond those, I'm curious how often software unavoidably  
"flips-out" under lustre and how long these commonly take to recover  
from.  Say the lock manager tweaks, etc.

I know this is a rather difficult metric to quantify, especially after  
experiences with.. other.. parallel filesystems.  Perhaps people have  
numbers for their specific configuration?

>
>
> Additionally, given Lustre's HA abilities, uptime is something you can
> throw money at (or not).  If you have a high amount of redundancy in
> your architecture, including failover pairs and so on, then downtime  
> is
> reduced as your redundant hardware kicks in to provide uptime where it
> would have not been had you not spent on and built that redundant
> architecture.
>
> There are probably lots of places where the same kind of arguments can
> be made, making the question all that more subjective.
>
> b.
>
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