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Re: [Qemu-devel] Windows and I/O size


From: Peter Lieven
Subject: Re: [Qemu-devel] Windows and I/O size
Date: Tue, 8 Jan 2013 09:53:44 +0100

Am 08.01.2013 um 09:50 schrieb Vadim Rozenfeld <address@hidden>:

> On Tuesday, January 08, 2013 10:16:48 AM Peter Lieven wrote:
>> Hi all,
>> 
>> I came across the fact that Windows seems to requests greater 64KB into
>> pieces leading to a lot of IOPs on the storage side.
>> 
>> Can anyone imagine of a way to merge them before sending them to e.g. an
>> iSCSI Storage? 64KB I/O Size is not optimal when e.g. large sequential
>> operations with an iSCSI target.
>> 
>> Thank you,
>> Peter
> Hi Peter.
> Is it viostor? Which version? The most recent one is able to handle 256K 
> blocks.

Not the recent. I will try 0.1.49 now.

256KB is still not that much but definitely better than 64KB. are this windows 
limits?

I have found docs in the net that windows splits up everything into 64kB 
requests. Is this
info old?

thank you,
Peter


> 
> Best regards,
> Vadim.




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