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List:       evms-devel
Subject:    RE: [Evms-devel] RE: Integrating Support for a Different RAID Engine
From:       "Mike Young" <myoung () wildernessvoice ! com>
Date:       2003-09-20 12:11:33
[Download RAW message or body]

I very much appreciate your comments on this.  It's very interesting.  I
never thought about it quite this way.

-Mike

-----Original Message-----
From: evms-devel-admin@lists.sourceforge.net
[mailto:evms-devel-admin@lists.sourceforge.net] On Behalf Of EXT / DEVOTEAM
VAROQUI Christophe
Sent: Friday, September 19, 2003 9:23 AM
To: 'evms-devel@lists.sf.net'

> - Online Capacity Expansion
> - RAID Level Migration
> - Mixed Drive Capacity Support
> - Distributed Hot Spare (reserve hot spare capacity, but all spindles
>  contribute to system performance)

This is all doable in userspace with DM. All you need is a more complete set
of RAID personalities for DM.

OCE :
doable by concat'ing new raid segment to the given target. You can even mix
raid personalities on different segments of a target.

RAID lvl migration :
allocate new segment with the dest personality by chunk, and miror to source
chunk on the dest chunk. When in sync move to the next chunk. This is close
to what pvmove does.

Mixed drice capacity :
naturaly given with the DM design, as allocation is segment based

Distributed Hot Spare :
Just a new policy to implement in the segment allocators to reserve a
segment per disk for sparing.

This all can be done in EVMS or in LVM2, though you won't have the speed
gains of your approach.

cheers,
cvaroqui


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