From: Evgeniy Polyakov <johnpol@...>
Subject: [0/3] Distributed storage. Mirror algo extension for automatic recovery.
Date: Oct 18, 3:17 pm 2007

Hi.
I'm pleased to announce sixth release of the distributed storage

subsystem, which allows to form a storage on top of remote and local

nodes, which in turn can be exported to another storage as a node to

form tree-like storages.
This release includes mirroring algorithm extension, which allows to

store 'age' of the given node on the underlying media.
In this case, if failed node gets new media, which does not contain

correct 'age' (unique id assigned to the whole storage during

initialization time), the whole node will be marked as dirty and

eventually resynced.
This allows to have completely transparent failure recovery - failed

node can be just turned off, its hardware fixed and then turned on. DST

core will detect connection reset and automatically reconnect when node

is ready and resync if needed without any special administrator's steps.
This patchset has been split into 4 parts:

0 - this introduction

1 - core files

2 - network state machine

3 - documentation and algorithms
Hope they all will find its way into mail lists.
Further TODO list includes:

* new redundancy algorithm (complex, low priority)

* some thoughts about distributed filesystem tightly connected to DST
Thank you.
Homepage:

http://tservice.net.ru/~s0mbre/old/?section=projects&item=dst
Signed-off-by: Evgeniy Polyakov 
--

	Evgeniy Polyakov

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From: Andrew Morton <akpm@...>
Subject: Re: [0/3] Distributed storage. Mirror algo extension for automatic recovery.
Date: Oct 26, 4:55 pm 2007

On Thu, 18 Oct 2007 23:17:41 +0400

Evgeniy Polyakov  wrote:
> I'm pleased to announce sixth release of the distributed storage

> subsystem, which allows to form a storage on top of remote and local

> nodes, which in turn can be exported to another storage as a node to

> form tree-like storages.
I went back and re-read last month's discussion and I'm not seeing any

reason why we shouldn't start thinking about merging this.
How close is it to that stage?  A peek at your development blog indicates

that things are still changing at a moderate rate?
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From: Evgeniy Polyakov <johnpol@...>
Subject: Re: [0/3] Distributed storage. Mirror algo extension for automatic recovery.
Date: Oct 27, 6:34 am 2007

Hi Andrew.
On Fri, Oct 26, 2007 at 01:55:38PM -0700, Andrew Morton (akpm@linux-foundation.org) wrote:

> > I'm pleased to announce sixth release of the distributed storage

> > subsystem, which allows to form a storage on top of remote and local

> > nodes, which in turn can be exported to another storage as a node to

> > form tree-like storages.

>

> I went back and re-read last month's discussion and I'm not seeing any

> reason why we shouldn't start thinking about merging this.

>

> How close is it to that stage?  A peek at your development blog indicates

> that things are still changing at a moderate rate?
I completed storage layer development itself, the only remaining todo item

is to implement new redundancy algorithm, but I did not see major demand

on that, so it will stay for now with low priority.
I will use DST as a transport layer for distributed filesystem, and

probably that will require additional features, I have no clean design so

far, but right now I have nothing in the pipe to commit to DST.
--

	Evgeniy Polyakov

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