[OpenIndiana-discuss] ISCSI SSD Performance

[Ian Collins]

Sašo Kiselkov wrote:
> On 02/16/2013 11:58 PM, Sašo Kiselkov wrote:
>> On 02/16/2013 11:37 PM, Ian Collins wrote:
>>> Have you tried the connecting to the volume form another IO host to
>>> eliminate vmware as the cause?
>> Second that.
>>
>> The 9k MTU might also be hitting some NIC driver bugs - non-standard
>> settings can, at times. Since the difference is only in the storage ->
>> VMware direction, I suspect there may be some trouble there (perhaps
>> VMware not being entirely okay with how OI is handling the 9k MTUs?).
> One more thing comes to mind: if all else fails, try to disable flow
> control. Sometimes it can mess up throughput, if the receiving NIC
> erratically sends too many TX frames - can be a driver issue in VMware,
> though this is quite a long stretch.
>
> Anyway, right now I suspect VMware might be the culprit here. The number
> of kittens that have to be slaughtered to get such a high packet
> switching performance from VMs to storage is astounding.

Which is one reason the visualised world should be using SmartOS!

-- 
Ian.