Manish Katiyar <mkatiyar@xxxxxxxxx> writes: > Hello all, > We are pleased to announce the first official functional release of Online > Hierarchical Storage Manager (OHSM v1.2). This is a RFC release and > not yet aimed at mainline inclusion. > > OHSM is a tool to manage and move data across various class of storage. > It can help users to selectively place and move data across tiers such > as SSD, Raid 10, Raid 6 based on the attributes of the data. OHSM > supports background movement of data > without any visible change in a files namespace to users and user applications. It does sounds like btrfs multy-device support. Can you please what it the differance? > OHSM is built as an external module with recompilation required for > ext4. The current version of OHSM is based upon kernel 2.6.32.2 > > This release includes 3 core kernel patches: > > 1) An initial ext4 patch to adjust ext4's block allocation to use a > preferred block range per Ted > Tso's Dec 2008 write-up > (http://markmail.org/message/qp7zjhhdzxum7rfn). This patch is not > ohsm specific. > 2) A ohsm specific ext4 patch to provide callouts to the ohsm module. > 3) The ohsm module itself > > The source code for OHSM v1.2 is freely distributable under GPL. > The latest stable OHSM v1.2 is available at : > http://sourceforge.net/projects/ohsm/files/OHSMv1.2.tar.gz/download > Sources are available as git repository at : > git://ohsm.git.sourceforge.net/gitroot/ohsm/ohsm > > The following list describes the features of OHSM > * Support for Ext4. > * File System callouts > * Policy based File Migration > * Per inode information maintainer in user xattr area > * XML based policy files > * Support for RAID > * DTD based XML validation > - Automatic Relocation engine > * Selective Relocation of mountpoint/Subdirectories > * Selection Relocation based on specific rule > * File Placement based on: > + UID > + GID > + File Type > + Directory Name > * File Migration based on > + UID > + GID > + FILE SIZE > + ACCESS AGE > + MODIFICATION AGE > - File Access Temperatue > - File I/O Temperature > + > (*=current features, -= on our todo list, +=support already present) > > Here are some simple examples :- > $ ohsm enable sample/ohsm.xml > OHSM enabled successfully on '/tmp/mnt' > > $ ohsm relocate -m /tmp/mnt > Relocation performed successfully. > > $ ohsm status /tmp/mnt > OHSM is enabled on '/tmp/mnt' > > $ ohsm disable /tmp/mnt > OHSM disabled successfully on '/tmp/mnt' > > $ ohsm > Usage: ohsm subcommand [optstring ..] [parameters ..] > Subcommands : > enable - Enable OHSM > disable - Disable OHSM > status - Show status of OHSM > relocate -Trigger relocation on filesystem > update - Update OHSM instance parameters > help -Show usage > > *Note* that the code for OHSM is still in early stages > Feedback, bug reports and patches, as always, are welcomed. > (ohsm-devel@xxxxxxxxxxxxxxxxxxxxx) -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
