[gpfsug-discuss] Allocation map limits - any way around this?

IBM Spectrum Scale scale at us.ibm.com
Tue Jul 10 17:17:58 BST 2018


The only additional piece of information I would add is that you can see 
what the maximum NSD size is defined for a pool by looking at the output 
of mmdf.

Fred

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From:   Jordan Robertson <salut4tions at gmail.com>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   07/10/2018 11:54 AM
Subject:        Re: [gpfsug-discuss] Allocation map limits - any way 
around this?
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



To second David's comments: I don't believe changing the max NSD size for 
a given storage pool is possible (it may be tied to the per-pool 
allocation mapping?), so if you want to add more dataOnly NSD's to a 
filesystem and get that error you may need to create a new pool.

The tricky bit is that I think this only works with dataOnly NSD's, as 
dataAndMetadata and metadataOnly NSD's only get added to the system pool 
which is locked in like any other.

-Jordan

On Tue, Jul 10, 2018 at 10:28 AM, Uwe Falke <UWEFALKE at de.ibm.com> wrote:
Hi Bob, 
you sure the first added NSD was 1 TB? As often as i created a FS, the max 

NSD size was way larger than the one I added initially , not just the 
fourfold. 

Mit freundlichen Grüßen / Kind regards


Dr. Uwe Falke

IT Specialist
High Performance Computing Services / Integrated Technology Services / 
Data Center Services
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From:   "Oesterlin, Robert" <Robert.Oesterlin at nuance.com>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   10/07/2018 13:59
Subject:        [gpfsug-discuss] Allocation map limits - any way around 
this?
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



File system was originally created with 1TB NSDs (4) and I want to move it 

to one 5TB NSD. Any way around this error?

mmadddisk fs1 -F new.nsd 

The following disks of proserv will be formatted on node srv-gpfs06:
    stor1v5tb85: size 5242880 MB
Extending Allocation Map
Disk stor1v5tb85 cannot be added to storage pool Plevel1.
Allocation map cannot accommodate disks larger than 4194555 MB.
Checking Allocation Map for storage pool Plevel1
mmadddisk: tsadddisk failed.
Verifying file system configuration information ...
mmadddisk: Propagating the cluster configuration data to all
  affected nodes.  This is an asynchronous process.
mmadddisk: Command failed. Examine previous error messages to determine 
cause.


Bob Oesterlin
Sr Principal Storage Engineer, Nuance
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