[gpfsug-discuss] Filesystem descriptor discs for GNR

IBM Spectrum Scale scale at us.ibm.com
Thu Mar 28 20:08:40 GMT 2019


This is a known issue.  The workaround is to use --force-nsd-mismatch
option.  Just make sure that the failure group is different from those used
by the vdisk NSDs

Regards, The Spectrum Scale (GPFS) team

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From:	Luke Sudbery <L.R.Sudbery at bham.ac.uk>
To:	"gpfsug-discuss at spectrumscale.org"
            <gpfsug-discuss at spectrumscale.org>
Date:	03/28/2019 01:45 PM
Subject:	[gpfsug-discuss] Filesystem descriptor discs for GNR
Sent by:	gpfsug-discuss-bounces at spectrumscale.org



We have a 2 site Lenovo DSS-G based filesystem, which with (some of the
data) replicated across the 2 sites. We'd like to a 3rd filesystem
descriptor disk so we can lose one site and still have filesystem
descriptor quorum. But this seems incompatible unless we make new vdisks -
which we can't do on non native raid servers.

We've added a new NSD which now has a free disc, but can't add that disk as
descOnly.

Adding the new descriptor disk to the system pool says:
  mmadddisk: A storage pool may not contain both vdisk NSDs and non-vdisk
NSDs.

Adding the new disk to a new system_desc pool says:
  mmadddisk: Disk usage descOnly is incompatible with storage pool
system_desc.

Tried adding config to specify the system_desc pool is for metadataOnly and
it still says it's incompatible.

There is no mention of descOnly disks here:
https://www.ibm.com/support/knowledgecenter/en/SSFKCN_4.1.0/com.ibm.cluster.gpfs.v4r1.gpfs200.doc/bl1adv_planning.htm


Is it possible add a non-vdisk descOnly NSD to a dss-g/GNR solution?

Cheers,

Luke

--
Luke Sudbery
Architecture, Infrastructure and Systems
Advanced Research Computing, IT Services
Room 103, Computer Centre G5, Elms Road

Please note I don't work on Monday and work from home on Friday.


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