[gpfsug-discuss] Metadata block size

Orlando Richards orlando.richards at ed.ac.uk
Tue Feb 11 22:34:49 GMT 2014

Hi Asgeir,

>From memory, you need to have the data disks going in as a separate storage pool to have the split block size - so metadata disks in the "system" pool and data disks in , say, the "data" pool. Have you got that split here?


Sent from my phone

> On 11 Feb 2014, at 17:23, Asgeir Storesund Nilsen <asgeir at twingine.no> wrote:
> Hi,
> I want to create a file system with 16MB for data blocks and 256k for metadata blocks.  Under filesystem version 13.01 ( this worked just fine, even when upgrading GPFS later.
> However, for a filesystem created with version 13.23 (, if I specify both data and metadata block sizes, the metadata block size applies for both.  If I do not specify metadata block size, the data block size (-B) is used for both.
> This has a detrimental impact on our metadataOnly NSDs, as they fill up pretty quickly.
> Are any of you aware of updates / bugs in GPFS that might help explain and alleviate this issue?  Any hints would be appreciated.
> Regards,
> Asgeir
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