Difference between revisions of "MicroSD Card Raid Plugin Module"

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(Replaced content with "moved to Solid State Media Recording Solution")
 
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==cost vs speed vs size==
moved to [[Solid State Media Recording Solution]]
 
===Speed===
 
12 Gbps = 1.5 GB/s
 
15 Gpbs = 1.875 GB/s
 
25 FPS 4096 x 2304 raw uncompressed 12 bit video daterate: 353.9 MB/s
 
50 FPS 4096 x 2304 raw uncompressed 12 bit video daterate: 707.8 MB/s
 
300  FPS 1920 x 1080 raw uncompressed 12 bit video daterate: 933.1 MB/s
 
100 FPS 4096 x 2304 raw uncompressed 12 bit video daterate: 1,415.6 MB/s
 
132 FPS 4096 x 2304 raw uncompressed 12 bit video daterate: 1,868.6 MB/s
 
300 FPS 4096 x 2304 raw uncompressed 10 bit video daterate: 3,538.9 MB/s
 
===Cost===
 
Prices evaluated March 2017:
 
If we filter out micro sd cards that have advertized write speed above 90MB/s the prices start at 0.50€/GB, pro brands are in the 0.60€/GB - 0.80€/GB ballpark.
 
2.5" SSDs with advertized write speeds of 450+MB/s start at around 0.25€/GB - 0.30€/GB
 
1.8" SSDs offer only very few models with 450+MB/s write speeds to choose from and prices are around 0.80€/GB - 1.90€/GB
 
M.2 SSDs connected over PCIe 3.0 x4 offering 1500+MB/s writespeed cost 0.40€/GB - 0.70€/GB and are the smallest and fastest option.
 
'''Conclusion:'''
Using 5 micro sd cards in a raid gives roughly the same combined speed as using one 2.5" SSD. In this configuration the SSD is less than half the price per GB as the micro SD raid at roughly the same physical dimensions.
 
When using 32 micro sd cards in the raid it would require roughly 7x 2.5" SSDs in a raid to match the same speed resulting in roughly 7 times the volume of the micro sd card raid.
 
===Size===
 
2.5" SSD: 70 x 100mm
 
1.8" SSD: 54 x 78mm
 
One micro SD card: 11 x 15mm
 
6x3 cards with small gap between cards and space to insert them plus an 23x23mm FPGA would require roughly the space of 64 x 104 mm (just slightly higher as the current 57.15mm that dual plugin modules occupy. Different layouts of cards are of course possible.
 
==Concept==
Dual Plugin Slot Module with total of 12 - 15 Gbps input
 
32 micro sd card slots with 16 cards on each PCB side:
 
[[File:Micro-sd-card-raid-concept-01.jpg | 400px]]
 
==Research & Notes==
* Manually selecting how many cards are used for increasing speed and how many are used for writing copies/backups would be very convenient.

Latest revision as of 14:04, 17 June 2017