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Re: point_lun is slow

Subject: Re: point_lun is slow
From: <karri(at)twins.dna.fi>
Date: Thu, 28 Oct 1999 07:09:43 +0300
In-Reply-To: <38174854.52B4@gsfc.nasa.gov>
Newsgroups: comp.lang.idl-pvwave
Organization: Clinet, Espoo, Finland.
References: <38170AD4.2EC9@gsfc.nasa.gov> <on7lk8n3fg.fsf@cow.physics.wisc.edu> <38174854.52B4@gsfc.nasa.gov>
Xref: news.doit.wisc.edu comp.lang.idl-pvwave:16963

George,

I am using FibreChannel disks and found out that reading a sector
at a time feels like reading a floppy. With chunk sizes of 256K
I get about 7MB/sec sustained speed. So at least on the Fibre you
have to use large chunks to get any kind of performance.

I also tried 64K chunks but the performance was much worse.

On Wed, 27 Oct 1999, George McCabe wrote:
> do you have a rule of thumb for optimizing chunk size?

--
Regards,

Karri Kaksonen
Picker Nordstar

References:
- point_lun is slow
  - From: George McCabe
- Re: point_lun is slow
  - From: Craig Markwardt
- Re: point_lun is slow
  - From: George McCabe

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