[gpfsug-discuss] Dell Multipath

[Peter Childs]

>From my experience using a Dell md3460 with zfs (not gpfs). I've not tried it with gpfs but it looks very simular to our IBM dcs3700 we run gpfs on.

To get multipath to work correctly, we had to install the storage manager software from the cd that can be downloaded from Dells website, which made a few modifications to multipath.conf<http://multipath.conf>.

Broadly speaking the blacklist comments others have made are correct.

You also need to enable and start multipathd (chkconfig multipathd on)

Peter Childs
ITS Research and Teaching Support
Queen Mary, University of London


---- Matt Weil wrote ----

enable
mpathconf --enable --with_multipathd y
show config
multipathd show config

On 4/25/16 3:27 PM, Jan Finnerman Load wrote:
Hi,

I realize this might not be strictly GPFS related but I’m getting a little desperate here…
I’m doing an implementation of GPFS/Spectrum Scale 4.2 at a customer and struggle on a question of disk multipathing for the intended NSD disks with their direct attached SAS disk systems.
 If I do a multipath –ll, after a few seconds I just get the prompt back. I expected to see the usual big amount of path info, but nothing there.

If I do a multipathd –k and then a show config, I see all the Dell disk luns with reasonably right parameters. I can see them as /dev/sdf, /dev/sdg, etc. devices.
I can also add them in PowerKVM:s Kimchi web interface and even deploy a GPFS installation on it. The big question is, though, how do I get multipathing to work ?
Do I need any special driver or setting in the multipath.conf file ?
I found some of that but more generic e.g. for RedHat 6, but now we are in PowerKVM country.

The platform consists of:
4x IBM S812L servers
SAS controller
  PowerKVM 3.1
Red Hat 7.1
2x Dell MD3460 SAS disk systems
No switches

Jan
///Jan

[cid:part1.01010308.03000406 at genome.wustl.edu]
Jan Finnerman
Senior Technical consultant

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<mailto:jan.finnerman at load.se>jan.finnerman at load.se<mailto:jan.finnerman at load.se>



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