Csibra Gergo wrote:
Hi, My name is Gergo Csibra, and I live in Hungary. I'm new to GlusterFS, but not new to Clustering/HPC and programming, I'm in GUG project (http://sourceforge.net/projects/gug) So, I want to make an ECC translator, with this we can make a raid like bricks. I think this very close to encryprion translators, because this does the same thing: reads data from client manipulate this data writes to subvolume an reverse: reads from subvolume manipulate (really only checks, and maybe repair) readed data sends to client. I've looked the rot-13 translator, and after 2 days of missconfiguration I can test it. My questions: The encryption translator reads and writes same amount of data, but I must write more data to device (the original plus the ECC info), and send less to the client (readed minus the ECC).
Actually, you probably just want to write and read the same amount, let the portion that does the ECC (or RAID-5, as that's really what you are implementing at this point) take care of everything.
The other thing, if I make for example 4 ECC bytes to every 16 user bytes, maybe I need to read data from before and after the original buffer.
You would probably be better off working with the striping translator, as what you really want is striping + parity (You can do it with a designated parity volume, but it kills performance, it is much easier to implement though).
What functions must I use, to do this thing? Is there some development documentation? ps. sorry for my english :)
Don't know much about dev docs. Maybe someone else can help you. -- -Kevan Benson -A-1 Networks
