[CentOS] write barrier support in CentOS 6

Tue Apr 1 06:24:42 UTC 2014
Tom Robinson <tom.robinson at motec.com.au>

On 01/04/14 14:27, Keith Keller wrote:
> On 2014-04-01, Tom Robinson <tom.robinson at motec.com.au> wrote:
>> Now, I understand that Red Hat (and therefore CentOS) backport many upstr=
>> eam features into the stock
>> kernel so how can I be sure that kernel 2.6.32-431.11.2.el6 has write bar=
>> rier support?
> I believe you can look through the RHEL tech notes.  Here they are for
> 6.5:
> https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/6.5_Technical_Notes/index.html
> If you require barriers, you can always use the mainline kernel from
> elrepo.  You can read about the mainline and long-term packages here:
> http://elrepo.org/tiki/kernel-lt
> You probably want the kernel-ml packages, but that page doesn't mention
> the -lt packages.  Lots of CentOS admins use these kernels (including
> me) and are happy with them.
Thanks Keith.

I took a look at the RHEL tech notes but nothing obvious springs out of that regarding LVM barriers.
I wouldn't have imagined it would be so hard to find and answer to this question.

I may go to the elrepo kernels but I'm always hesitant when it comes to changing the core of the system.

Anyone else care to comment or have a clue about LVM barriers in the current kernel?

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