Re: tgt / rbd performance

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On 12/11/2014 11:39 AM, ano nym wrote:
> 
> there is a ceph pool on a hp dl360g5 with 25 sas 10k (sda-sdy) on a
> msa70 which gives me about 600 MB/s continous write speed with rados
> write bench. tgt on the server with rbd backend uses this pool. mounting
> local(host) with iscsiadm, sdz is the virtual iscsi device. As you can
> see, sdz max out with 100%util at ~55MB/s when writing to it. 
> 
> I know that tgt-rbd is more a proof-of-concept then production-ready. 
> 
> Anyway, is someone using it and/or are there any hints to speed it up?
> 

Increasing the tgt nr_threads setting helps. Try 64 or 128.

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