Lustre discuss - Dec 2007 - Will it be possible for a 1.4.x client to mount a 1.6.x file system?

I have two clusters, one is running 1.4.11 and one is
running 1.6.x, will the 1.4.11 clients be able to mount
the file system created on the 1.6.x cluster?  If so,
how do I do that?

Thanks!

Rei

Hey Rei,

You may want to check the archives for a more complete answer.  The
short answer is you need to first create a 1.4 based file system and
then upgrade it to 1.6.  The reason is some log files that are required
for 1.4 are not automatically created when you make a 1.6 file system.

--Shane

-----Original Message-----
From: lustre-discuss-bounces at clusterfs.com
[mailto:lustre-discuss-bounces at clusterfs.com] On Behalf Of Rei Lee
Sent: Thursday, December 06, 2007 10:08 AM
To: lustre-discuss at clusterfs.com
Subject: [Lustre-discuss] Will it be possible for a 1.4.x client to
mount a1.6.x file system?

I have two clusters, one is running 1.4.11 and one is
running 1.6.x, will the 1.4.11 clients be able to mount
the file system created on the 1.6.x cluster?  If so,
how do I do that?

Thanks!

Rei

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Shane,

Thanks for the pointers.  What was missing is the CFS version of the
e2fsprog RPM.  After the right RPM was installed, I was able to upgrade
the 1.4 file system to 1.6 and the file system was mounted both on the
1.4 clients and 1.6 clients.   

However, when I  added another OSTs to the upgraded file system,
only 1.6 clients saw the size increase and file copy worked fine on
the 1.6 clients .  The file system size did not increase on the 1.4
clients and file copy failed on the 1.4 client (errors like "No such
device").   

It may not be possible to upgrade the 1.4 clients to 1.6 at this
point.  Would there be other ways to allow cross mount between
1.4 and 1.6 while we are still able to add storage to the 1.6 file
system?

Thanks!

Rei

Canon, Richard Shane wrote:
> Hey Rei,
>
> You may want to check the archives for a more complete answer.  The
> short answer is you need to first create a 1.4 based file system and
> then upgrade it to 1.6.  The reason is some log files that are required
> for 1.4 are not automatically created when you make a 1.6 file system.
>
> --Shane
>
> -----Original Message-----
> From: lustre-discuss-bounces at clusterfs.com
> [mailto:lustre-discuss-bounces at clusterfs.com] On Behalf Of Rei Lee
> Sent: Thursday, December 06, 2007 10:08 AM
> To: lustre-discuss at clusterfs.com
> Subject: [Lustre-discuss] Will it be possible for a 1.4.x client to
> mount a1.6.x file system?
>
> I have two clusters, one is running 1.4.11 and one is
> running 1.6.x, will the 1.4.11 clients be able to mount
> the file system created on the 1.6.x cluster?  If so,
> how do I do that?
>
> Thanks!
>
> Rei
>
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at clusterfs.com
> https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
>

On Tue, 2007-12-11 at 10:37 -0800, Rei Lee wrote:
> 
> However, when I  added another OSTs to the upgraded file system,
> only 1.6 clients saw the size increase and file copy worked fine on
> the 1.6 clients .  The file system size did not increase on the 1.4
> clients and file copy failed on the 1.4 client (errors like "No such
> device").   
Indeed.  1.4 clients will only work with 1.6 OSTs that were upgraded
from 1.4 OSTs.  Brand new 1.6 OSTs will not work with 1.4 clients.
> It may not be possible to upgrade the 1.4 clients to 1.6 at this
> point.  Would there be other ways to allow cross mount between
> 1.4 and 1.6 while we are still able to add storage to the 1.6 file
> system?
In theory (meaning this has not been tested and is not advocated -- and
perhaps somebody will tell me I''m wrong), you could create the new OSTs
as 1.4 OSTs by rolling your MDT back to 1.4 and using lconf --write-conf
to write an updated XML configuration and then upgrade the MDT back to
1.6 and then upgrade the new OSTs to 1.6.  Sounds like quite a hassle to
me though.  Personally I''d explore options to get the clients upgraded.

b.