[gpfsug-discuss] Filesystem descriptor discs for GNR

Luke Sudbery L.R.Sudbery at bham.ac.uk
Thu Mar 28 23:03:52 GMT 2019


Thanks – I haven’t tried this, but docs for mmadddisk say “Only the system storage pool can contain metadataOnly, dataAndMetadata, or descOnly disks.” actually.

Truong’s --force-nsd-mismatch option worked.

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: gpfsug-discuss-bounces at spectrumscale.org <gpfsug-discuss-bounces at spectrumscale.org> On Behalf Of janfrode at tanso.net
Sent: 28 March 2019 18:33
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Subject: Re: [gpfsug-discuss] Filesystem descriptor discs for GNR

There seems to be some changes or bug here.. But try usage=dataOnly pool=neverused failureGroup=xx.. and it should have the same function as long as you never place anything in this pool.


-jf
tor. 28. mar. 2019 kl. 18:43 skrev Luke Sudbery <L.R.Sudbery at bham.ac.uk<mailto:L.R.Sudbery at bham.ac.uk>>:
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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