How do I get 4GB/s sustained performance on RAID 0
Posted 23 June 2016 - 02:27 PM
Posted 21 July 2016 - 12:28 AM
simple fact is in my opinion you don't have enough drives in raid 0 to sustain 4GBs writes.
say a drive has 100MBs av write speed, (speed changes depending on where on the drive data is being written) so for 4GBs you would need 40 drives in raid 0.
40x100=4000 or 4GB
so i'd expect your 10 drives in raid 0 to be able to sustain about 1GBs (8Gbs) write is that what your seeing?
when you initially start writing to a drive it will fill up it's cache first (which is much faster than writing directly to the drive platters.) and why it starts off very fast, but as soon as the cache is filled it then needs to write the data from the cache to the drive and this is when things slow down to it's actual write capabilities.
anyway to get 4GBs sustained you will need to know what the write speeds of your drives are and then have enough of them in a raid 0 setup to accomplish what you require.
eg. max sustained data rate for a 4TB wd red is 150MBs according to this review, notice that's max and not minimum :- http://techreport.co...-drive-reviewed
so even using it's max writes you'd need 27 drives in raid 0 to get your required 4GBs
must admit that is a lot of data you want to write per second and i can't think of anything a normal home user would need such high transfer speeds for, not even recording 4k video at 60fps needs 4GBs write speeds as far as i know.
Edited by terry1966, 22 July 2016 - 10:22 AM.
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