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Isilon data protection levels and number of drives it uses per node
Hi there,
I am guessing this question might have been already asked before, but i didn't find a right link to understand it correctly -
I am trying to understand more about Isilon data protection levels and how does it stripe data across the drives in the cluster,
Say if i have 3 nodes, protection level config as +2d:1n, and file sizes of 512KB each. how would the stripes occur ?, does the behavior change as we add more nodes? any explanation would help.
Regards,
Sameer
SameerKulkarni1
37 Posts
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March 20th, 2017 08:00
Also, how many drives per node are used for striping the data across, i am assuming it is different number for each protection level.
kipcranford
125 Posts
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March 20th, 2017 13:00
Coincidentally, I talk about +2d:1n protection on a 513 KiB file in this discussion (but the concepts apply to your question as well):
Re: n+2:1 Protection Parity Calc
> Also, how many drives per node are used for striping the data across, i am assuming it is different number for each protection level.
OneFS uses a limited number of drives PER NODE for the layout of any given file -- think of the stripes as occurring "across" nodes, where each node uses a couple of drives for each stripe. For really large files (> about 32 MiB), OneFS will start to rotate the drives it uses for the file's stripes, so big files can end up using all the drives in a file's disk pool.
SameerKulkarni1
37 Posts
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March 21st, 2017 02:00
thanks, that helped.