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Thanks Remo, 

Agree’d, ephemeral will pretty much always be faster, I’m seeing orders of magnitude difference between the 2, at times.  After a bunch of testing, I’m pretty convinced its not KVM/QEMU or iscsi configurations, it’s looking like its something with my 3par configuration.  Initially thought it may just be a function of growing a sparce volume, but running IO tests multiple times, I still get inconsistent results.  

Anyway, thanks for the reply.. 

JC


Jim Colestock
jcolestock at gmail.com <mailto:jcolestock at gmail.com>

> On Jan 12, 2018, at 11:18 AM, Remo Mattei <Remo at italy1.com> wrote:
> 
> I think that ephemeral will always be faster than iscsi.  We do use PURE on 10GB even though it’s fast but local is faster. 
> 
> Remo 
> 
>> On Jan 12, 2018, at 6:27 AM, Jimmy Colestock <jcolestock at gmail.com <mailto:jcolestock at gmail.com>> wrote:
>> 
>> Hello All, 
>> 
>> Fighting an issue with cinder iscsi performance being much slow than local ephemeral disk.  We’re running multi-path with dual 10Gb nic, offloading is working and bandwidth across the links is minimal.   I’ve looked at kernel schedulers in the VM’s and tried them all.  
>> 
>> I still need to dig into the storage side (3Par), but just curious if anyone has any suggestions while I keep troubleshooting.  
>> 
>> Thanks for any help.
>> 
>> JC
>>  
>> 
>> Jim Colestock
>> jcolestock at gmail.com <mailto:jcolestock at gmail.com>
>> https://www.linkedin.com/in/jcolestock/ <https://www.linkedin.com/in/jcolestock/>
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