 | | | Machine slows down during heavy I/O and retries on AS3up4 , ia64 m/c with 32 | Machine slows down during heavy I/O and retries on AS3up4 , ia64 m/c with 32 2005-07-12 - By Arjan van de Ven
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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?
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