Hi Sheila, On Fri, Oct 12, 2007 at 12:27:23PM -0600, Sheila Barthel wrote:
> Not a problem to add a section in the Lustre manual re: supported upgrades. > However, as we do not currently sync Lustre releases with releases of the > Lustre manual, this wouldn't help us to address the issue that Jeff poses. I don't think we need to list specific versions or anything. Just include the general policies I have outlined below as well as some examples - that way the information won't need to be revised regularly. Cheers, Jody > For future Lustre releases, could we add a supported upgrade/interop > statement to the change log? I'll also add this content to the manual (which > will have more value once Lustre s/w and manual releases are synchronized). > > Sheila > > On 10/12/07, Jody McIntyre <[EMAIL PROTECTED]> wrote: > > > > Hi Jeff, > > > > On Fri, Oct 12, 2007 at 12:01:04PM -0400, Jeff Blasius wrote: > > > > > I've seriously trekked through the lustre documentation and haven't > > > found an answer regarding this. Is there an official policy regarding > > > interoperability among different versions of various lustre > > > components? > > > > By coincidence, I just sent information about this to our documentation > > team. It should eventually reach the manual. Here it is: > > > > --- > > Our supported upgrades are from one minor version to another, for > > example 1.4.10 to 1.4.11 or 1.6.2 to 1.6.3, and also from the latest > > 1.4.x version to the latest 1.6.x version, so 1.4.11 to 1.6.3 is > > supported. > > > > We also support downgrades within the same ranges. For example, if you > > upgrade from 1.6.2 to 1.6.3, you can also downgrade to 1.6.2 (but a > > fresh install of 1.6.3 is _not_ guaranteed to be downgradeable.) > > > > Note that other combinations will work and we support them in specific > > cases when requested by customers, but the ranges above will always > > work. > > --- > > > > > For example (and I'm sure other groups are in the same boat here), > > > it's relatively painless to perform a rolling upgrade to the lustre > > > clients, but upgrading the OSS or MDS takes more convincing. Is it OK > > > for me to run a patched but 1.6.0 based OSS with a 1.6.3 client? In > > > this case all of the lustre components (kernel, lustre, ldiskfs) are > > > the same version for each host. Similarly, is it OK to run a lustre > > > kernel version out of sync with the userland tools? For example a > > > 1.6.0 kernel with a 1.6.3 lustre build on the same host? > > > > Not necessarily. You should do a rolling upgrade to 1.6.1, then 1.6.2, > > then 1.6.3. Upgrading will be easier if you stay more current - 1.6.0 > > is fairly old at this point. > > > > Having said that, I believe 1.6.0 and 1.6.3 is actually something that > > will work, but I'm not 100% certain of this, so I'll allow others to > > correct me. > > > > Cheers, > > Jody > > > > > I understand that many of these combinations do in fact work, I'm more > > > interested if they're likely to lead to data corruption or client > > > evictions. I'm not sure how often incompatibilities arise, but if it's > > > relatively rare, it would be useful if that was announced on the > > > change log. Of course if there's a serious "Do at your own risk" > > > policy that would also be useful to know. > > > > > > Thank You, > > > jeff > > > > > > -- > > > Jeff Blasius / [EMAIL PROTECTED] > > > Phone: (203)432-9940 51 Prospect Rm. 011 > > > High Performance Computing (HPC) > > > Linux Systems Design & Support (LSDS) > > > Yale University Information Technology Services (ITS) > > > > > > _______________________________________________ > > > Lustre-discuss mailing list > > > [email protected] > > > https://mail.clusterfs.com/mailman/listinfo/lustre-discuss > > > > > > > -- > > > > _______________________________________________ > > Lustre-discuss mailing list > > [email protected] > > https://mail.clusterfs.com/mailman/listinfo/lustre-discuss > > > > -- _______________________________________________ Lustre-discuss mailing list [email protected] https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
