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тАО01-08-2005 03:13 PM
тАО01-08-2005 03:13 PM
RAID EDUCATION
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тАО01-08-2005 03:57 PM
тАО01-08-2005 03:57 PM
Re: RAID EDUCATION
I atached a detailsed power point Presentation on Raid Systems.
Hope this helps.
Regards,
Syam
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тАО01-09-2005 03:15 AM
тАО01-09-2005 03:15 AM
Re: RAID EDUCATION
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тАО01-09-2005 06:52 AM
тАО01-09-2005 06:52 AM
Re: RAID EDUCATION
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тАО01-09-2005 08:57 AM
тАО01-09-2005 08:57 AM
Re: RAID EDUCATION
As far as IO size after generating load with various test tools for some time. The average write is 8k the average read is 17K that at least is what Perfmon tells me. I am still working to research the SQL layer of this and how it contributes to the IO size. Oddly enough I would not expect the IO size to be that small since the most used rows in the DB are rows that contain a blob which should average 1.5MB in size. So I am now looking into how SQL passes datat to the next layer.
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тАО01-09-2005 05:08 PM
тАО01-09-2005 05:08 PM
Re: RAID EDUCATION
Why don't you just change the stripe size to a smaller value then? Most RAID controllers today have 64K or 128K as default, but also support 8K, 16K, 32K, ... all the way up to 256K.
Regards,
Ross
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тАО01-09-2005 05:08 PM
тАО01-09-2005 05:08 PM
Re: RAID EDUCATION
A lot of what you ask is dependant on the particular array that you are talking to. Also, is the stripe size that you are using configured from the O/S or on the array? Most arrays don't give you the option to change the stripe size as they make it irrelevant due to the use of cache. When you write to an array, your data will go into the cache and be written to the disk in the most efficient way when the cache becomes full. So I suspect you are talking about O/S configured striping, in which case I would tune your stripe to the default write size of your file system. HPUX using VxFS the default is 8k/write. So the best thing to do yould be to set your stripe size to 8k. It does not matter what the actual size of the total I/O is as it will be broken up into 8k chunks for writing to the file system. You can change the default to 16k if that fits your I/O profile better, so change your stripe size also.
Regards
Iain Ashley
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тАО01-09-2005 09:30 PM
тАО01-09-2005 09:30 PM
Re: RAID EDUCATION
Guess what is faster - a full 8 or 16K transfer from a single disk drive or an additional wait, which, on average takes half the rotational delay (8 milliseconds for a 15k RPM disk).
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тАО01-09-2005 09:52 PM
тАО01-09-2005 09:52 PM
Re: RAID EDUCATION
you could know more about the RAID technologies through reading this Introduction to RAID Technology from the following web site:
http://www.utexas.edu/cc/vms/about/raid.html
Regards
Nidal Ali
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тАО01-10-2005 02:33 AM
тАО01-10-2005 02:33 AM