[LU-4566] Downgrade lustre version from lustre 1.8.9 to 1.8.7

• Status: Resolved
• Project: Lustre
• Type: Task
• Priority: Minor
• Reporter: Supporto Lustre Jnet2000 (Inactive)
• Assignee: Cliff White (Inactive)
• Resolution: Not a Bug

Environment

redhat 5.7

lustre-1.8.9-2.6.18_348.3.1.el5_lustre.g0667314_g7880158
kernel-2.6.18-348.3.1.el5_lustre.g0667314

Description

For testing purpose, we want to downgrade our lustre environment to version 1.8.7 starting from 1.8.9. Is this operation supported and without risks?
regards

Comments

[Peter Jones]

Could you please clarify - was this cluster initially installed as 1.8.7-wc1 then upgraded to 1.8.9-wc1, or was it a fresh install of 1.8.9-wc1?

[Supporto Lustre Jnet2000 (Inactive)]

Hi, the cluster is initially 1.8.7-wc1 and the upgraded to 1.8.9

regards

[Peter Jones]

This should work ok in theory but we only explicitly tested upgrading/downgrading from/to 1.8.8-wc1 during 1.8.9-wc1 release testing. We would certainly help you with any problems that you ran into during such a downgrade. Having said that, why would you want to do such a downgrade? Have you run into issues on 1.8.9-wc1?

[Supporto Lustre Jnet2000 (Inactive)]

Hi,
we must upgrade Lustre in production environment from 1.8.7wc1 to 1.8.9wc1, but the customer asks for a rollback plain if something not works. Is there an official procedure to downgrade ?

regards

[Cliff White (Inactive)]

There should be no issues during a downgrade, as you are moving only two minor releases. There are no changes to the Lustre configuration, only versions of the RPMs change. For downgrade, you would simply re-install the previous set of RPMS. Also, there are no issues in this case with a mixed environment, so you can do a rolling upgrade or a rolling downgrade. The cluster and clients should work just fine with any mix of 1.8.7-wc1 and 1.8.9-wc1.

[Gabriele Paciucci (Inactive)]

I have talked with the customer, please mark this issue as resolved. Thanks

[Peter Jones]

ok - thanks Gabriele!