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iosched question [message #30997] Thu, 12 June 2008 08:56 Go to next message
dietmar is currently offline  dietmar
Messages: 54
Registered: March 2007
Member
From: openvz.org
Hi all,

whats the best iosched for openvz servers. I found:

"The deadline scheduler uses five I/O queues to keep track of I/O. It's
designed to emphasize
average read-request response time for workloads that seek all over the
disk."

Maybe the deadline scheduler is better than using the default cfq?

- Dietmar
Re: iosched question [message #31003 is a reply to message #30997] Thu, 12 June 2008 13:36 Go to previous message
TheWiseOne is currently offline  TheWiseOne
Messages: 66
Registered: September 2005
Location: Pennsylvania
Member
From: openvz.org
Dietmar Maurer wrote:
> Hi all,
>
> whats the best iosched for openvz servers. I found:
>
> "The deadline scheduler uses five I/O queues to keep track of I/O. It's
> designed to emphasize
> average read-request response time for workloads that seek all over the
> disk."
>
> Maybe the deadline scheduler is better than using the default cfq?
>
>   
deadline may provide overall more system throughput, but the OpenVZ I/O 
priorities are an extension of the CFQ elevator so no CFQ = no I/O 
priorities.

Thanks,
Matt
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