[lustre-discuss] OST partition sizes

Andrew Wagner andrew.wagner at ssec.wisc.edu
Wed Apr 29 06:14:45 PDT 2015


We've continued using the 128KB stripes to the disks. The performance 
dropoff going from 8+2 128KB to 10+2 128KB was measurable but not a 
game-changer for us, particularly as the filesystems that are using 10+2 
are mixed-use rather than HPC scratch.

I'm not sure if we tested using larger stripe sizes on the 10+2 arrays 
to see if performance got any better. Do you have any test results on 
10+2 128KB vs 10+2 256KB?

Andrew Wagner
Research Systems Administrator
Space Science and Engineering
University of Wisconsin
andrew.wagner at ssec.wisc.edu | 608-261-1360

On 04/28/2015 08:59 PM, Nguyen Viet Cuong wrote:
> We normally use 8+2 in RAID6 with 128KB chunk.
>
> Andrew, what is stripe size in case of your 10+2 config? Sometime I 
> use 256KB to make it 2.5MB stripe because I think 1.25MB is unreasonable.
>
> On Wed, Apr 29, 2015 at 5:35 AM, Andrew Wagner 
> <andrew.wagner at ssec.wisc.edu <mailto:andrew.wagner at ssec.wisc.edu>> wrote:
>
>     We try to do 8+2 where it's convenient, but when we end up with 12
>     disk raid arrays in some places we do 10+2.
>
>     Andrew Wagner
>     Research Systems Administrator
>     Space Science and Engineering
>     University of Wisconsin
>     andrew.wagner at ssec.wisc.edu  <mailto:andrew.wagner at ssec.wisc.edu>  | 608-261-1360
>
>     On 04/28/2015 03:01 PM, Andrus, Brian Contractor wrote:
>>
>>     Quick question/survey:
>>
>>     What is the partition size folks use for their OSTs and why?
>>
>>     Brian Andrus
>>
>>     ITACS/Research Computing
>>
>>     Naval Postgraduate School
>>
>>     Monterey, California
>>
>>     voice: 831-656-6238
>>
>>
>>
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>
>
>
> -- 
> Nguyen Viet Cuong

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