From: Krzysztof Adamski <k-list@adamski.org>
To: Pieter De Wit <pieter@insync.za.net>
Cc: linux-raid@vger.kernel.org
Subject: Re: Looking for help how to migrate 2disk RAID1 to 3 disk RAID6
Date: Tue, 31 Dec 2013 23:54:01 -0500 [thread overview]
Message-ID: <1388552041.5058.25.camel@oxygen.netxsys.com> (raw)
In-Reply-To: <52C36908.2010701@insync.za.net>
On Wed, 2014-01-01 at 14:02 +1300, Pieter De Wit wrote:
> On 1/01/2014 13:51, Krzysztof Adamski wrote:
> > I have a system with two drives like this:
> > / RAID1 on sda3 and sdb3
> > /boot RAID1 on sda1 and sdb1
> >
> > I would like to migrate to
> > / RAID6 on sdi3, sdj3 and sdh3
> > /boot RAID1 on sdi1, sdj1 and sdh1
> >
> > The /boot already done.
> > How would I do the migration to RAID6?
> >
> > The new drives i,j and h are larger then a and b, after the migration I
> > will reshape the raid to use all the space on the new raid, unless it is
> > possible to do it in one step.
> >
> > The reason I want RAID6 and not RAID1 with 3 drives is that later I may
> > add more drives to the array.
> >
> > Currently I don't trust any RAID that has only one parity drive, it has
> > to survive a failure of any two drives. So RAID6 or triple RAID1 are a
> > minimum.
> >
> > Thanks in advance,
> > K
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> Hi,
>
> RAID Level 6 requires a minimum of 4 drives to implement
>
> Cheers,
>
> Pieter
I have seen messages by Neil from 2011 that he was planning to remove
this silly minimum requirement of 4 drive for RAID6.
next prev parent reply other threads:[~2014-01-01 4:54 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-01 0:51 Looking for help how to migrate 2disk RAID1 to 3 disk RAID6 Krzysztof Adamski
2014-01-01 1:02 ` Pieter De Wit
2014-01-01 4:54 ` Krzysztof Adamski [this message]
2014-01-01 7:15 ` Tomas M
2014-01-01 15:02 ` Krzysztof Adamski
2014-01-01 10:33 ` Pieter De Wit
2014-01-01 15:10 ` Krzysztof Adamski
2014-01-01 22:06 ` Pieter De Wit
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