[Lustre-discuss] status of lustre 2.0 on 2.6.18-194.17.1.0.1.el5 kernels

[Temple Jason]

And what impact do you forsee from this article?

-----Original Message-----
From: lustre-discuss-bounces at lists.lustre.org [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Andreas Dilger
Sent: martedì, 11. gennaio 2011 21:55
To: Michael Shuey
Cc: lustre-discuss at lists.lustre.org
Subject: Re: [Lustre-discuss] status of lustre 2.0 on 2.6.18-194.17.1.0.1.el5 kernels

The interoperability for 2.x releases has been the following for a long time:

- 1.8 clients will work with 1.8 and 2.x servers (through some version of x to be determined), though they may not be able to take advantage of newer features being added to 2.x. In some cases, the 2.x features need to be turned off until all of the clients have been upgraded to 2.x.
- 2.x clients will not be able to interoperate with 1.8 servers.

That means that it is necessary to upgrade the servers to 2.x before the clients, or at the same time. 

Also, the upgrade process of the servers from 1.8 to 2.x is "disruptive" to the client - the client is evicted and automatically reconnects to the 2.x server using the new wire protocol. Any client doing RPCs at the time of the upgrade will get an IO error, so running jobs on the clients need to be at least paused.
 
Cheers, Andreas

On 2011-01-11, at 13:24, Michael Shuey <shuey at purdue.edu> wrote:

> What does that imply for sites migrating from 1.8 to 2.1?  Presumably
> some sites will have both 1.8 and 2.1 filesystems; will those sites
> need to run 2.0 on the clients to mount both FS versions concurrently?
> 
> --
> Mike Shuey
> 
> 
> 
> On Tue, Jan 11, 2011 at 3:07 PM, Andreas Dilger <adilger at whamcloud.com> wrote:
>> While 2.0 was submitted to quite heavy testing at Oracle before it's
>> release, it has not been widely deployed for production at this point. All
>> of the develoment and maintenance effort has gone into the next release
>> (2.1) which is not released yet. I think that 2.1 will represent a much more
>> sustainable target for production usage, when it is released. Until that
>> happens, I would only recommend 2.0 for evaluation usage, and especially for
>> sites new to Lustre that they stay on the tried-and-true 1.8 code base.
>> 
>> Cheers, Andreas
>> On 2011-01-11, at 12:56, Samuel Aparicio <saparicio at bccrc.ca> wrote:
>> 
>> thanks for this note.
>> is lustre 2.0 regarded as stable for production?
>> Professor Samuel Aparicio BM BCh PhD FRCPath
>> Nan and Lorraine Robertson Chair UBC/BC Cancer Agency
>> 675 West 10th, Vancouver V5Z 1L3, Canada.
>> office: +1 604 675 8200 cellphone: +1 604 762 5178: lab
>> website http://molonc.bccrc.ca
>> 
>> 
>> 
>> 
>> On Jan 7, 2011, at 5:11 PM, Colin Faber wrote:
>> 
>> Hi,
>> 
>> I've built several against 2.6.18-194.17.1.el5 kernels without problem
>> so I would think you can probably get away with 0.1 as well.
>> 
>> -cf
>> 
>> 
>> On 01/07/2011 06:05 PM, Samuel Aparicio wrote:
>> 
>> Is it known if Lustre 2.0 GA will run with 2.6.18-194.17.1.0.1.el5
>> 
>> kernels. The test matrix has only the 164 kernel as the latest tested.
>> 
>> Professor Samuel Aparicio BM BCh PhD FRCPath
>> 
>> Nan and Lorraine Robertson Chair UBC/BC Cancer Agency
>> 
>> 675 West 10th, Vancouver V5Z 1L3, Canada.
>> 
>> office: +1 604 675 8200 cellphone: +1 604 762 5178: lab website
>> 
>> http://molonc.bccrc.ca <http://molonc.bccrc.ca/>
>> 
>> 
>> 
>> 
>> 
>> 
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>> 
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