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

[Ulrich Windl]

>>> Andrei Borzenkov <arvidjaar at gmail.com> schrieb am 10.10.2019 um 11:05 in
Nachricht
<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).
However 
> 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?

Hi!

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
/lib/modules/4.12.14-197.18-default
/lib/modules/4.12.14-197.18-default/kernel
/lib/modules/4.12.14-197.18-default/kernel/drivers
/lib/modules/4.12.14-197.18-default/kernel/drivers/md
/lib/modules/4.12.14-197.18-default/kernel/drivers/md/md-cluster.ko

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.

Regards,
Ulrich


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