linux-ext4 - Re: [ANNOUNCE] Online Hierarchical Storage Manager (OHSM v1.2)

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Date:	Tue, 23 Feb 2010 10:14:08 +0300
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	Manish Katiyar <mkatiyar@...il.com>
Cc:	OHSM-DEV <ohsm-devel@...ts.sourceforge.net>,
	kernelnewbies <kernelnewbies@...linux.org>,
	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [ANNOUNCE] Online Hierarchical Storage Manager (OHSM v1.2)

Manish Katiyar <mkatiyar@...il.com> 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@...ts.sourceforge.net)
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