[Lustre-discuss] (no subject)

Evan Felix evan.felix at pnl.gov
Fri Mar 6 09:37:47 PST 2009


Sebastion, you are correct on the OST Memory, you probably wont need the
16GB, and if you can save money on using only 4GB, and buy bigger/more
drives, you will probably be better off.

Evan


On 3/5/09 6:29 PM, "Sebastian Gutierrez"
<sebastian.gutierrez at cs.stanford.edu> wrote:

> Hello
> 
> I am looking for advice or suggestions on specking the MDS and OSS for a
> new file system I am building.
> 
> The IO patterns as have been explained to me are jobs that either create a
> big mpeg file or thousands of about 100kb frames for video.
> This could grow to hudreds of thousands of 100k files.
> 
> I have specked
> 2 MDS for a cluster
> 8x300GB SAS 15k drives for the MDT in a raid 10(I used raid 10 to reduce
> the chance of the MDT becomming a bottleneck with many small files)
> 2x300GB SAS 15k drives for the MGS in a raid 1
> 1xHostpare
> 32gb 800mhz ram
> 3.0 or 2.5 dual quad core procs
> 
> 4 OSS servers
> 16GB 667mhz ram
> 2.5 ghz dual quad core procs
> 6x1TB SATA 3 7.2k disks 5TB OST in a raid 5 (possibly running software raid)
> expandable to 2 5TB OSTs Per OSS
> 1xHotspare
> 
> Since this is the first Lustre file system I am building.  I noticed the
> sizing page:
> http://manual.lustre.org/manual/LustreManual16_HTML/SystemLimits.html#50548887
> _46859
> 
> The document mentions only dual core procs in regards to the MDS.
> 
> The document also mentions a much lower amount of system RAM required for
> the OST.
> 
> Am I wasting resources here by over-specking these boxes or is it a good
> idea to over spec a bit?
> 
> Am I on the right track based on the IO pattern as I understand it?
> 
> Sebastian
> 
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