Betsy Schwartz wrote:
> I've been handed a pre-production cluster that was rolled back from Oracle
> RHEL6 UEK3 to UEK2, because it was having mysterious performance and
> authentication issues. It is now having mysterious performance,
> authentication, and multipath issues. All necessary services are running.
>
> This is the first time I've encountered downgrading a major release of a
> kernel and I'm having a little trouble finding documentation. Many hits,
> nothing optimistic or detailed, nothing on UEK.
>
> Does anyone have any tips, gotchas, things to check ? I am particularly
> trying to figure out whether any installed rpm's need to be downgraded or
> reinstalled.
>
> Service owners hope to avoid a full bare-metal reinstall. Person who did
> rollback is unavailable.
Since an expected benefit from the roll-back didn't happen
maybe that exonerates the kernel. If so, maybe returning to UEK3
would be a better choice. If not, say if you're thinking a more
complete roll-back including all the packages is needed
yum downgrade <package1> <package2> ...
Packages recently upgraded can be found using rpm:
rpm -qa --queryformat '%-30{INSTALLTIME} %-30{NAME}\n' | sort -n
although you'd have to convert the timestamp into something
readable - it's in seconds from start of Unix epoch IIRC.
HTH,
--
Charles
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