I am new to the whole SSD thing, but I don't understand how the following works?
I need to be very specific for this question to make sense.
1 x LSI MegaRAID SAS 9361-8i 570$
8 x Ultrastar SSD800MH MLC 200GB 8x1450 = 11.600$
Total cost: 12.170$
Expected performance in RAID 0:
read: 140x8 = 1.120.000 IOPS
write: 100x8 = 800.000 IOPS
space: 200x8 = 1.6TB
On the other hand we have:
ioDrive2 Duo 1.2TB SLC
Total cost: 28.500$
read: 580.000 IOPS
write: 535.000 IOPS
One will say: RAID 0 will fail. But the truth is ioDrive2 Duo can also fail, so you have to buy 2 and RAID 1 them.
I understand the different between SLC and MLC (performance and durability), but the Ultrastar drives seems really solid and unless you torment them, they won't die.
All in all, what is wrong with my calculations? Why people buy those PCIe cards and they don't build arrays of drives? It's more simple to manage, but it costs more than double?