[Lustre-discuss] OST redundancy between nodes?

[Carlos Santana]

Thanks Brian.

I was wondering what will happen during OST failure
 - if client is making some read/write operation
- if client requests read/write after OST fails

When I made OSS unavailable the client waited/got delayed response
till OSS connected back. I am not sure about OST failure though. Any
clues?

-
CS.


On Thu, Jun 25, 2009 at 10:34 AM, Brian J. Murrell<Brian.Murrell at sun.com> wrote:
> On Thu, 2009-06-25 at 10:21 -0500, Carlos Santana wrote:
>>
>> I am confused about this. Will the files in that OST be unavailable or
>> some of the files in that filesystem be unavailable?
>
> Both.  An OST contains objects.  For singly striped files (the default),
> a single object is the entire file (data).  So losing an OST means
> losing the object which means losing the file (contents).
>
>> My impression is that lustre would stripe file data across many OSTs
>> in terms of objects.
>
> It *may*.  By default it does not.
>
>> So wouldn't failure of one OST will potentially
>> corrupt the files which have stripes/objects stored over that OST?
>
> Yes.  This is the other side of the "both" I mentioned above.
>
> b.
>
>
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