Re: osd pool erasure code stripe width

[Loic Dachary <loic@dachary.org>]

[-- Attachment #1: Type: text/plain, Size: 959 bytes --]

Hi Tom,

A stripe width of 4KB (the default) means the object is encoded 4KB at a time. It does not show in the file written to disk.

Cheers

On 19/06/2015 22:11, Deneau, Tom wrote:
> I am trying to understand the use of "osd pool erasure code stripe width"
> For example, I have a single-node system with a k=2,m=1 ec pool
> and I write a single 40M object to this pool using rados bench.
> But when I look on the disk, I still see only the 3 20M pieces for this object.
> Where does the striping get used?
> 
> -- Tom Deneau, AMD
> 
> 
> Description:
> Sets the desired size, in bytes, of an object stripe on every erasure coded pools. Every object if size S will be stored as N stripes and each stripe will be encoded/decoded individually.
> Type:
> Unsigned 32-bit Integer
> Default:
> 4096
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
> 

-- 
Loïc Dachary, Artisan Logiciel Libre


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 198 bytes --]