[Moosefs-users] ChunkServer in different Level

[Ken <ken...@gm...>]

hi, moosefs

We plan to use moosefs as storage for huge amount photos uploaded by users.
Because of read operations of new files are very more than old files,
maybe write new files to SSD is a choice.
For strict safe reason, we must backup content to an other data center.
And more features in maintain purpose are required.

I don't think moosefs can work fine in these situation. We try to
implement these features several weeks ago. Till now, it's almost
done.

Is there anyone interested in this?

more detail:
# Add access_mode(none, read, write capability) to struct
matocserventry(matocserv.c). This value can be changed from
outside(maybe from the python cgi)
# mfschunkserver.cfg add 'LEVEL' config, if not, LEVEL=0 as normal.
ChunkServer report it to Master if need.
# Add uint32_t levelgoal into struct fsnode(filesystem.c).
# Add uint32_t levelgoal into sturct chunk(chunk.c).
 As seen, uint32_t levelgoal = uint8_t levelgoal[4], implied LEVEL
should be 1,2,3 or 4.
 [2,1,0,0] mean store 2 copies in level=1 ChunkServer, store 1 copy in
level=2 ChunkServer.
# In chunk_do_jobs(chunk.c), send replicated command to ChunkServer.
This policy should be very complicated in future.
# Also, we add read/write levelgoal support in mfstools.

We plan to put these trivial change into github or somewhere else.

It's a very incipient prototype. We appreciate any advice from the
develop team and other users.

Regards
-Ken