raid3 is slow

[R. B. Riddick]

Eric wrote:
>>>         inside:        102400 kbytes in   3.416896 sec =    29969
kbytes/sec
>>>
>> Looks slow...
>
> You think so?  I think that's pretty acceptable for a UDMA100 device.
>
Yup... I thought, it was 2MB/sec... Dont know why... 29-55 is good...

--- Szabó Péter <matyee at mail.alba.hu> wrote:

> > And what if u try this:
> > dd if=/dev/raid3/... of=/dev/null bs=1m count=128
> > ?
> 
> #dd if=/dev/raid3/nmivol of=/dev/null bs=1m count=128
> 128+0 records in
> 128+0 records out
> 134217728 bytes transferred in 1.555843 secs (86266891 bytes/sec)
>
OK

> > 8KB/transfer is a little low for my taste... Looks like ur copy program 
> > uses
> > 32KB transfers, instead of 128KB transfers...
> 
> > What if u try
> > dd if=/source-file/on/raid3-device of=/dev/null bs=1m count=128
> > ?
> 
> dd if=/mnt/vol/site/video/Sissi_2-3/SISSI_2.ISO of=/dev/null bs=1m count=128
> 128+0 records in
> 128+0 records out
> 134217728 bytes transferred in 6.096775 secs (22014545 bytes/sec)
> 
Hmm...
It is still quite slow (the raw device can do about 80MB/sec)...
Is it better than with mc?
How was CPU-usage / system-load?

-Arne


 
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