[OSM-dev] 0.6 move and downtime (re-scheduled)

[Stefan de Konink]

Matt Amos wrote:
>> At the time I wrote my paper on OSM Dec2008, there was
>> about 72GB of CSV data. Thus with lets say 128GB you will have your
>> entire database *IN MEMORY* no fast disks required.
> 
> in 8Gb kits? that would be *extra* expensive (about £8,680 according
> to froogle).

Some people are more wise and would go for the froogle solution, cheap 
hardware, split data, profit ;)

>> ...or are you actually moving from OS to Solaris to utilize those 10
>> disks for your lets say less than 100G worth of geodata using them as
>> duplicates in the pool [opposed to integrity duplicates]?
> 
> partly, yes. RAID10 uses a mixture of striping and mirroring to
> increase performance without sacrificing reliability.

Mirroring will not increase performance because your RAID card will not 
a priori know what files you are interested in, only the blocks you are 
interested in and in the worst case will grab the same data from the 
same disks and compare it ;)


Stefan