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List:       evms-devel
Subject:    Re: [Evms-devel] Raid 5 free space
From:       Mike Tran <mhtran () us ! ibm ! com>
Date:       2005-05-20 15:34:34
Message-ID: 1116603274.6590.24.camel () langvan2 ! homenetwork
[Download RAW message or body]

On Fri, 2005-05-20 at 08:15, David Greaves wrote:
> Mike Tran wrote:
> 
> >>How about this situation.  Lets just use his current configuration as a base
> >>here.  8x 250gb disks.  Ok, one fails, adds a 320gb.  Now, lets say at some
> >>point, he replaces the other disks with 320gb disks as well (ie, manually
> >>fails a 250gb, replaces with 320gb, it resyncs.  Repeat until all 250gb disks
> >>are removed).  Now you have 70gb of each 320gb disk lost.  Is it possible to
> >>expand the raid5 from the original 8x 250gb to 8x 320gb size or would he
> >>have to throw away the current raid5 and recreate it?
> >>    
> >>
> >
> >Good point.  We should consider the capability to "grow/expand" raid5
> >without adding a new member.  Furthermore, we can do this on line in
> >some cases.
> >  
> >
> You are aware that mdadm already offers this capability aren't you?

Yes, I am.  Neil Brown implemented the resize code in kernel MD driver
about 9 months ago and mdadm had the support some time after that.  I
will enhance the existing raid5 resize code in EVMS to support this kind
of expand.

--
Regards,
Mike T.




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