Comment Re:100 TB for $1,000,000? No way! (Score 1) 165
I used that backblaze analogy too, but after yours, @ano:
http://hardware.slashdot.org/comments.pl?sid=1735418&cid=33075574
It comes up to $45K/90TB tops, in just one 4U enclosure, management overhead and real estate included. ($50K/100TB)
To answer @spazimodo, the Taiwan-built Barracuda XT disks have low failure rates compared to the Seagate disks built in China, and you can combine them in RAID 6 or 60 with Adaptec controllers for $1-2K more. Why would you ever use RAID 5 anyway, that's insane. We're talking raw storage here, so backup hardware, snapshots, replication are exactly the same as the 1M/100TB raw space estimate. If you want real usable space data all costs included, get 2 such servers, let's say at $50K each with RAID 6 controllers and fiber optics cluster connection. That's 74TB of usable space, plus another 74TB on the backup clustered server, or $135K/100TB usable space.
Even a backblaze enclosure comprised exclusively of SSD disks for performance would cost only $72K per enclosure, hardware and 1st year costs included, about $640K/100TB. But I assume this level of performance is far above the $1M figure, assumedly for SAS disks, and which also probably spreads out the hardware cost onto 3 years, so it's more like $0.5M for pure SSD 100TB. It would really help if the article would detail that $1M cost.
SSD costs assuming 256GB disks @ $700 each. 1 backblaze 4U server would provide only 11TB of SSD raw space, 9TB of usable RAID 6 space.