[Lustre-discuss] Lustre interoperability between the various 1.6.x releases

[Karsten Weiss]

Hi,

regarding the Lustre interoperability between the various 1.6.x releases 
the manual currently says this:

13.1 Lustre Interoperability

For Lustre 1.6.4, the following upgrades are supported:
[...]
* One minor version to the next (for example, 1.6.3 > 1.6.4 and 1.4.11 > 
  1.4.12).

Could someone please elaborate on this?

1. Is it generally okay(^1) to upgrade the patchless clients to 1.6.x+1
   while the servers are still at 1.6.x?

2. Is it generally okay to upgrade the servers to 1.6.5.x+1 while some
   of the patchless clients are still at 1.6.x?

My understanding is that both is allowed and supported. Correct?

3. Is there any required/recommended upgrade order between MDSes and
   OSSes doing a rolling upgrade from 1.6.x to 1.6.x+1? (Especially
   when there are active clients)

Basically my question is this: Which version combinations between clients, 
MDSes and OSSes are allowed and which are not?

Thanks in advance!

Regards,
Karsten

^1: Appart from bugs like
    https://bugzilla.lustre.org/show_bug.cgi?id=16237

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