[gpfsug-discuss] GPFS for DBs..MySQL, PGSQL, etc; How about VMware?

Christoph Krafft ckrafft at de.ibm.com
Fri Sep 4 07:53:51 BST 2015

Hi Zach,

VMware is covered via Pass-through Raw Device Mapping (RDM) with physical
compatibility mode if you want direct disk access inside the VM.
Otherwise works as a "normal" GPFS client

Go to: "Table 28. VMware support matrix" @

Have a client using this in production with x86 RHEL running on top of
VMware ... it works well. They use RDM since the VMs do have disk access

Mit freundlichen Grüßen / Sincerely

Christoph Krafft

Client Technical Specialist - Power Systems, IBM Systems
Certified IT Specialist @ The Open Group
 Phone:            +49 (0) 7034 643 2171                     IBM Deutschland GmbH                              
 Mobile:           +49 (0) 160 97 81 86 12                   Hechtsheimer Str. 2                               
 Email:            ckrafft at de.ibm.com                        55131 Mainz                                       
 IBM Deutschland                                                                                               
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From:	Zachary Giles <zgiles at gmail.com>
To:	gpfsug main discussion list <gpfsug-discuss at gpfsug.org>
Date:	03.09.2015 16:59
Subject:	[gpfsug-discuss] GPFS for DBs..MySQL, PGSQL, etc; How about
Sent by:	gpfsug-discuss-bounces at gpfsug.org

Hello Everyone,

Medium-time user of GPFS, MySQL, PostgreSQL, etc here..  Decent sized
system in production, hundreds of nodes, lots of tuning etc. Not a
newb. :)
Looking for opinions on running database engines backed by GPFS.
Has anyone run any backed by GPFS and what did you think about it?

I realize there are tuning guides and guide-lines for running
different DBs on different file systems, but there seems to be a lack
of best-practices for doing so on GPFS.

For example, usually you don't run DBs backed by NFS due to locking,
cacheing etc.. You can tune those out with sync, hard, etc, but, still
the best practice is to use a local file system.
As GPFS is hybrid, and used for many apps that do have hard
requirements such as Cinder block storage, science apps, etc, and has
proper byte-level locking.. it seems like it would be semi-equal to a
lock file system.

Does anyone have any opinions, experiences, or recommendations for
running DBs backed by GPFS?
Also will accept horror stories, gotcha's, and "dont do it's". :)

On that same note...
How about VMware?
Obviously I guess really the only way would be via NFS export.. which
cNFS was .. not the best at (my opinion). Maybe Protocol Servers are
better? Maybe also a "don't do it"?


Zach Giles
zgiles at gmail.com
gpfsug-discuss mailing list
gpfsug-discuss at gpfsug.org

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