Re: [HPDD-discuss] Upgrading lustre servers from 2.6.0 to 2.6.90 risks

The 2.6.91 tag is for a pre-release version of Lustre. That means that it is still possible there are major bugs, protocol changes, and other fixes to be made before release. As Patrick points out, there is at least one serious bug that prevents downgrading once you've upgraded, which might be necessary if you hit other bugs. I would only recommend using 2.6.9x for testing at this point, and not for production releases. What is the reason you want to upgrade to a development tag instead of sticking on a maintenance branch? Cheers, Andreas -- Andreas Dilger Lustre Software Architect Intel High Performance Data Division On 2015/01/06, 9:00 AM, "Patrick Farrell" <paf@cray.com<mailto:paf@cray.com>> wrote: Upgrading should be OK, but it is not currently possible to downgrade to 2.6 (or earlier versions). See LU-6050 for details: https://jira.hpdd.intel.com/browse/LU-6050 Depending on what you do while the system is upgraded, you may be able to downgrade, but any files created while 2.6.90 was running will have permissions issues, and it's possible to get in a situation where you can't write to the file system after downgrade. - Patrick On 01/06/2015 03:17 AM, Jérôme BECOT wrote: Hello, Can someone here confirm if i'm safe from any risk of data corruption or any further troubles by upgrading my MDS and OSS servers software from the online feature release 2.6.0-RC2--PRISTINE-2.6.32-431.20.3.el6_lustre.x86_64 to the last 2.6.91 version ? or is there some modifications that may lead to a possible crash ? (proceeding to the usual stop-start services respecting the good order) We are running test over our new platform here that lasts for more consequent purposes and as the 2.7 will be out there shortly we want to keep it functionnal in 2.6. Thanks