To give you a little bit of background when the OSD writes into his journal it uses D_SYNC and O_DIRECT. Writing with O_DIRECT bypasses the Kernel page cache, while D_SYNC ensures that the command won’t return until every single write is complete. So yes, basically the OSD forces all the writes to be flushed prior to start the next IO.

Open Kinetic is an open source Collaborative Project formed under the auspices of the Linux Foundation dedicated to creating an open standard around Ethernet-enabled, key/value Kinetic devices.

Kinetic is a drive architecture in which the drive is a key/value server with Ethernet connectivity. The architecture is inspired by the scale out data center in which Ethernet and Linux are ubiquitous, open source software reduces barriers to entry, and hardware is becoming more commoditized.

EnhanceIO can work with any block device, be it an entire physical disk, an individual disk partition, a RAIDed DAS device, a SAN volume, a device mapper volume or a software RAID (md) device.

Stats Geeks: Now it’s Your Turn.

Backblaze Online Backup has released the raw data collected from the more than 41,000 disk drives in our data center. To the best of our knowledge this is the largest data set on disk drive performance ever to be made available publicly.