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Machine slows down during heavy I/O and retries on AS3up4

Machine slows down during heavy I/O and retries on AS3up4

2005-07-14       - By Sandhya Suman

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> -- ---- ---- ---- ---- ---- --
>
> Message: 5
> Date: Tue, 12 Jul 2005 19:44:19 +0200
> From: Arjan van de Ven <arjanv@(protected)>
> Subject: Re: Machine slows down during heavy I/O and retries on AS3up4
>   ,   ia64 m/c with 32GB memory
> To: "Discussion of Red Hat Enterprise Linux 3 (Taroon)"
>   <taroon-list@(protected)>
> Message-ID: <1121190260.3171.39.camel@(protected)>
> Content-Type: text/plain; charset="us-ascii"
>
> On Tue, 2005-07-12 at 14:07 -0400, Sandhya Suman wrote:
>> Hi All,
>>
>> We are facing some problem with below environment.
>>
>> Processor : Intel Itanium 2 (IA64)
>> OS : AS3 Update 4 (Errata kernels  2.4.21-27.0.2.EL)
>> Memory : 32 GB
>> Number of processor = 4
>>
>> Observations:
>> - Heavy I/O is going on 2/3 raw devices bind to SCSI devices.
>> - Path plug pull was done. (Fiber channel cable was plugged out.)
>> - Upper layer application retries I/O due to fiber channel pullout.
>>
>> In above scenario the machine slow down was observed. Simple
>> command like `ls` was taking considerable time.
>>
>> When we reduced memory from 32GB to 8GB behaviour was not
>> reproducible. Please let us know whether it is issue due to
>> high memory (32GB) usages.As per Redhat on ia64 processor on AS3up4
>> works
>> fine with 128GB memory.
>
> what chipset was this (one with or without IOMMU ?) and what storage
> controller?
>
The HBA controller i am using is qla2300.
How to check on my machine for the chipset whether it is using IOMMU or not?

Regards
Sandhya

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