Can't help you at all I'm afraid, but i am interested in how you determined
the stripe size of 64k.
--
Niall Litchfield
Oracle DBA
Audit Commission UK
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Please include version and platform
and SQL where applicable
It makes life easier and increases the
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"Ralph" <rlro99_at_hotmail.com> wrote in message
news:e2c49cae.0306110515.4ebe8c86_at_posting.google.com...
> Hi All,
>
> I am an Oracle DBA but was recently asked to sort out a SAS system
> running on win 2000 which was really struggling with its batch taking
> over 20hours. Nobody knows much about SAS round here though I could
> tell that the system was terribly IO bound. It was decided to throw
> hardware at the problem and I specified (with compaqs help) a high end
> disk subsystem.
>
> I realise that this is not oracle but was hoping that somebody here
> may be able to help...as I was...
>
> The system is as follows.
>
> Compaq DL580 4 x 2ghz Xeons
> Twin Smart Array 5300 4 Channel Raid Controllers ( each connected to a
> separate IO Bus) 256MB Cache on each.
> Four SW4354 Storage Shelves, each with two Ultra3 SCSI buses and
> fourteen 72GB Ultra3 15K RPM hard disks.
>
> These are configured into 2 x 26 Drive Raid 1+0 arrays. (We have a
> global hot spare in each storage enclosure). Each array is connected
> to its own 5300. Stripe size of 64k.
>
> Each of the 4 channels on the 5300's are capable of 160mb/s giving
> 640mb/s across each 5300.
>
> When all this was set up I got the boys who configured it to copy a
> 2gb file from one array to the other. Now I think that 24 secs is
> pretty slow and would have thought 4-8 secs would be more like it. 24
> secs indicates an actual write speed of approx 80mb/s.
>
> Any Suggestions? Am I being unrealistic in expecting this subsystem to
> be able to write at about 260mb/s (20mb per spindle?)? Is something
> misconfigured or is this the best I can expect?
>
> Thanks
>
> Ralph
Received on Thu Jun 12 2003 - 11:46:41 CDT
