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SubjectRe: System unresponsitive when copying HD/HD
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> If I have vmstat running, I notice blocks trickling out to the disk, 5sec averages
> 495,142,151,155,136,257,15,0. Note that the maximum read rate (hdparm -t) of this
> disk is in the 12-14M/s range. I'm getting about 1-5% of that on output with the
> system's disk subsystem being apparently unable to do anything else.
>
> This is with IDE hard disk with DMA enabled.
>
> a) is this expected performance on a large linear write?

No

> b) should I expect other disk operations to be denied service as long as
> the write is 'flushing'?

No

But try 2.4.1 before worrying too much. That fixed a lot of the block
performance problems I was seeing (2.4.1 ruins the VM performance under paging
loads but the I/O speed is fixed ;))

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