[ClusterLabs] Antw: Re: Where to find documentation for cluster MD?

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Thu Oct 10 07:05:12 EDT 2019

>>> Andrei Borzenkov <arvidjaar at gmail.com> schrieb am 10.10.2019 um 11:05 in
<CAA91j0WFSzk86Vob6ROtocmSofqwJBT6pFpj=0KeXbvAT41mKQ at mail.gmail.com>:
> On Thu, Oct 10, 2019 at 11:16 AM Ulrich Windl
> <Ulrich.Windl at rz.uni‑regensburg.de> wrote:
>> Hi!
>> In recent SLES there is "cluster MD", like in 
> cluster‑md‑kmp‑default‑4.12.14‑197.18.1.x86_64 
> (/lib/modules/4.12.14‑197.18‑default/kernel/drivers/md/md‑cluster.ko).
> I could not find any manual page for it.
>> Where is the official documentation, meaning: Where is a description of the

> feature supprted by SLES?
> E‑h‑h . . . did you try High Availability Extension Administration Guide?


Yes, found chapter 22, but I was thinking of some mentioning in "man 4 md" or
"man -k md"...
Also the admin guide is a "american manual" (tell you what to do, but not how
it works).
In the meantime I also found a LWN article that explains some details, but I
would expect such documentation to be part of the OS...or at least some file in
the rpm package:

# rpm -ql cluster-md-kmp-default-4.12.14-197.18.1.x86_64

The description just says:
Description :
Clustering support for MD devices. This enables locking and
synchronization across multiple systems on the cluster, so all
nodes in the cluster can access the MD devices simultaneously.


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