NEW FEATURE:
- new object reclaim scheme: Sheep uses new garbage collection algorithm for reclaiming objects. Disk consumption of deleted VDIs are reduced dramatically. -- In addition, the limitation of maximum number of children (snapshots and clones) is resolved. Creating more than 1024 snapshots or clones from single virtual disk is allowed.
- iSCSI multipath: now tgtd isn't a single point of failure
- VDI locking: opening single VDI by multiple QEMU process is not allowed
DOG COMMAND INTERFACE:
- output format of "dog vdi snapshot" with -v option is changed
- remove "dog vdi object"
- instead, "dog vdi object location" is the new name of the previous "dog vdi object"
- new subcommand "dog vdi object map" for printing map of inode objects
- new option "-l" to "dog node kill" for killing sheep daemon on localhost without specifying ID
- allow snapshot tags which start with decimal number (e.g. "123abc")
- enhance "dog cluster snapshot' to restore previous default format redundancy.
- add a version control to cluster snapshot.
- 'cluster snapshot' layout is changed and DO NOT keep backward compatibility.
NEW FEATURE:
- hyper volume: use B-tree structure to replace index-array in sd_inode so the max size of vdi could extent from 4TB to 16PB.
- Erasure Code: a new redundancy scheme that uses error correction algorithm to achieves high available of data with much less storage overhead compared to complete replication
- HTTP simple storage: a new interface to retrieve any amount of data with a simple web services interface.
DOG COMMAND INTERFACE:
- new subcommand "vdi cache purge" for cleaning stale object cache
- "vdi cache purge" cleans stale cache of all images
- "vdi cache purge
" cleans stale cache of the specified image
- new subcommand "node stat" for showing I/O status of the node
- new subcommand "node log level" for changing log level at runtime
- "node log level set" sets loglevel of running sheep process
- "node log level get" gets loglevel from running sheep process
- "node log level list" lists avialable loglevels
- new option "-o" of "vdi track", for tracking objects with their oids
- new option "-y" of "vdi create", for create hyper-volume vdi
- new option "-s" of "cluster info", show backend store information
- new option "-t" of "cluster format", choose not serve write request if number of nodes is not sufficient
- modify option "-c" of "vdi create", we can specify "x:y" for erasure code
- new subcommand "node stat" for node request satistics
- "node stat -w" set watch mode for this command
SHEEP COMMAND INTERFACE:
- improvements of help messages
- change format of the size format in -j (journaling) and -w (object cache) options. The new format is: n[TtGgMmKkb]. e.g. "-j size=1024M".
- rotate log when sheep process catches SIGHUP signal
- remove "-o" option for choosing stdout as an output of log
- remove "-f" option for executing sheep as a foreground process
- "-o" and "-f" is a same thing to "-l dst=stdout"
- unified "-l" option
- "-l format=..." for log format
- "-l level=..." for log level
- "-l dst=..." for log destination
- new option '-r' to enable http service
- modify option "-c" of "cluster format", we can specify "x:y" for erasure code