[OmniOS-discuss] iSCSI poor write performance

[Martin Truhlář]

Yes, I'm aware, that problem can be hidden in many places.
MTU is 1500. All nics and their setup are included at this email.

Martin

-----Original Message-----
From: Dan McDonald [mailto:danmcd at omniti.com] 
Sent: Wednesday, September 09, 2015 6:32 PM
To: Martin Truhlář
Cc: omnios-discuss at lists.omniti.com; Dan McDonald
Subject: Re: [OmniOS-discuss] iSCSI poor write performance


> On Sep 9, 2015, at 12:24 PM, Martin Truhlář <martin.truhlar at archcon.cz> wrote:
> 
> Hello everybody,
>  
> I have a problem here, I can’t move with. My Windows server runs as virtual machine under KVM. I’m using a 10GB network card. On this hw configuration I expect much better performance than I’m getting. Two less important disks uses KVM cache, that improve performance a bit. But I don’t want to use KVM‘s cache for system and databases disks and there I’m getting 6MB/s for writing. Also 4K writing is low even with KVM cache.


So you have windows on KVM, and KVM is using iSCSI to speak to OmniOS?  That's a lot of indirection...

Question:  What's the MTU on the 10Gig Link?

Dan


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