Fusion-io

Question 0

FIO: What is a filter?

Answer 0

A filter is a C++ object that handles data on the IOstack.

Question 1

FIO: How many Volume Filter Stacks are there per volume?

Answer 1

One

Question 2

FIO: What is a Paged Pool Volume?

Answer 2

A filter that manages layers. It checks with the journal filter to check for a cache hit. On a miss, it then uses layers to determine the location of the data.

Question 3

FIO: What is the journal filter?

Answer 3

The journal filter checks to see if the data needed is stored in flash. It has a circular queue to store data in, and is responsible for destaging old data as well as storing data from writes.

Question 4

FIO: What does a layer do?

Answer 4

A layer maps virtual storage locations to physical.

Question 5

Why can’t I just turn on asynchronous mode for FUSE?

Answer 5

Because FUSE wasn’t added into the kernel until 3.10, and we are running 3.6.

Question 6

What script starts up TierStore?

Answer 6

/ngs/bin/NexGenStorage

Question 7

FIO: what is the code name for 3.1?

Answer 7

Skor