[gpfsug-discuss] Blocksize

[Brian Marshall]

To keep this great chain going:

If my metadata is on FLASH, would having a smaller blocksize for the system
pool (metadata only) be helpful.

My filesystem blocksize is 8MB

On Fri, Sep 23, 2016 at 6:34 PM, Stef Coene <stef.coene at docum.org> wrote:

> On 09/22/2016 08:36 PM, Stef Coene wrote:
>
>> Hi,
>>
>> Is it needed to specify a different blocksize for the system pool that
>> holds the metadata?
>>
>> IBM recommends a 1 MB blocksize for the file system.
>> But I wonder a smaller blocksize (256 KB or so) for metadata is a good
>> idea or not...
>>
> I have read the replies and at the end, this is what we will do:
> Since the back-end storage will be V5000 with a default stripe size of
> 256KB and we use 8 data disk in an array, this means that 256KB * 8 = 2M is
> the best choice for block size.
> So 2 MB block size for data is the best choice.
>
> Since the block size for metadata is not that important in the latest
> releases, we will also go for 2 MB block size for metadata.
>
> Inode size will be left at the default: 4 KB.
>
>
>
> Stef
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