good data - presentation was hard to follow, though. would've been easier to understand if it were presented in a table/grid.

I found it interesting that FB uses 2.5" drives in RAID 10 config. I would imagine the lower power of the drives makes up for the increased cost.

I would think that they're significantly slower, but it looks like Seagate makes a reasonably priced 10,000RPM SCSI 2.5" drive.

Interesting about the 10KRPM 2.5" SCSI drives. How bad is the power consumption for equivalent SATA configurations?

AdWords used pretty much the same rig for MySQL servers (RAID 10) although the drives were all 15K 3.5" SCSI drives.

Facebook and flickr seem to be about equivalently efficient; Facebook is about 10x bigger and uses about 10x as many servers. Fotolog seems much more efficient than either though; it's about the same size as flickr, but uses only 1/3 as many servers.

YouTube SuSE 9 ?