[gpfsug-discuss] NSD device type

[Scott Denham]

gpfsug-discuss-bounces at gpfsug.org wrote on 09/14/2012 06:00:03 AM:


> From: Arif Ali <mail at arif-ali.co.uk>

> All,
>
> We are moving from rdac to multipath on one our customer
> installations, and the nsd type of the disk is generic, but when
> multipath is required, we need the device type to be changed to dmm.
>
> We know we can change it using "mmchconfig updateNsdType=$PWD/nsdchange"
>
> where file nsdchange has the following input
>
> <nsdname> dmm
>
> Would this have any impact on the disks themselves, or does this only
> change /var/mmfs/gen/mmsdrfs.
type to be changed to dmm.
> >treat
> > We know we can change it using "mmchconfig updateNsdType=
$PWD/nsdchange"
> >
> > where file nsdchange has the following input
> >
> > <nsdname> dmm
> >
> > Would this have any impact on the disks themselves, or does this only
> > change /var/mmfs/gen/mmsdrfs.
> >
> > Any clues on this would be great

No impact on the contents of the disks, but you do have to have the file
system unmounted everywhere to do this - all of the nodes must be using the
same disk mode type.
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