MooseFS 3.0 Easter Edition!

Dear MooseFS Community,


A new version of MooseFS is coming to you on Easter with some new exciting features and specially built packages for "MooseFS 3.0 Easter Edition for Raspberry Pi 2" running on Raspbian Wheezy :)


Among many updates and fixes, that are laboriously listed in source packages change log, here’s a quick view on most important changes and new features:


  • Added new functionality for Storage Tiering (possibility to assign labels to chunkservers and use those labels in mfssetgoal expressions when defining policies for storing, keeping and archiving data),
  • Performance improvement for small file random I/O due to the new semantics for close() system call, which now by default has the same behaviour as on any local Linux/FreeBSD filesystem,
  • Support for global locks compatible with POSIX locks and flock() advisory lock mechanism when using fuse 2.9+.


Simple test of unpacking complete source tree for latest Linux kernel (more than 50k objects with cumulative size of more than 630 MB when unpacked) shows 100% speed improvement when going from MooseFS version 2.0.x to version 3.0.x.


Be sure to check the documentation on new storage tiering feature and installation instructions at


Best regards,
MooseFS Team


2015-04-07 08:00 by Piotr Robert Konopelko MooseFS MooseFS (comments: 4)

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Comment by Piotr Robert Konopelko | 2016-04-22

Upgrading from MFS 2.0 to MFS 3.0 is like a normal upgrade. Please remember to do a backup of your metadata.mfs file after stopping Master Server, because there's no rollback from MFS 3.0 to MFS 2.0.


Please read Chapter 2 of MooseFS Upgrade Guide, it describes an order of the upgrade, which is crucial. you can find it here:


You can find information about MooseFS repository here:


Please also take a look at best practices:


Comment by Edik Mkoyan | 2016-02-25

Is there a repo for ubuntu, or maybe instructions how to upgrade from 2.0.* to 3?

Comment by Piotr Robert Konopelko | 2015-04-30

You can find the answer in the MooseFS 3.0 - Labels Manual in paragraph 2.5 (on page 10):

Comment by Sascha | 2015-04-30

Can you explain in detail for the new labels what "CREATE" and "KEEP" means?