[gpfsug-discuss] Filesystem descriptor discs for GNR

Luke Sudbery L.R.Sudbery at bham.ac.uk
Thu Mar 28 23:01:24 GMT 2019


Thanks, that worked.

Will this be addresses in a future update?

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.

From: Truong Vu <truongv at us.ibm.com> On Behalf Of scale at us.ibm.com
Sent: 28 March 2019 20:09
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>; Luke Sudbery (IT Research Support) <L.R.Sudbery at bham.ac.uk>
Subject: Re: [gpfsug-discuss] Filesystem descriptor discs for GNR


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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[Inactive hide details for Luke Sudbery ---03/28/2019 01:45:16 PM---We have a 2 site Lenovo DSS-G based filesystem, which with (]Luke Sudbery ---03/28/2019 01:45:16 PM---We have a 2 site Lenovo DSS-G based filesystem, which with (some of the data) replicated across the

From: Luke Sudbery <L.R.Sudbery at bham.ac.uk<mailto:L.R.Sudbery at bham.ac.uk>>
To: "gpfsug-discuss at spectrumscale.org<mailto:gpfsug-discuss at spectrumscale.org>" <gpfsug-discuss at spectrumscale.org<mailto: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<mailto: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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