From: Thomas Harold <thomas-lists@nybeta.com>
To: Maurice Hilarius <maurice@harddata.com>
Cc: lists@xunil.at, linux-raid@vger.kernel.org
Subject: Re: from 2x RAID1 to 1x RAID6 ?
Date: Tue, 07 Jun 2011 19:59:34 -0400 [thread overview]
Message-ID: <4DEEBB66.7080802@nybeta.com> (raw)
In-Reply-To: <4DEE84F0.2030205@harddata.com>
On 6/7/2011 4:07 PM, Maurice Hilarius wrote:
> On 6/7/2011 12:12 PM, Stefan G. Weichinger wrote:
>> Greetings, could you please advise me how to proceed?
>>
>> On a server I have 2 RAID1-arrays, each consisting of 2 TB-drives:
>>
>> ..
>>
>> Now I would like to move things to a more reliable RAID6 consisting of
>> all the four TB-drives ...
>>
>> How to do that with minimum risk?
>>
>> ..
>> Maybe I overlook a clever alternative?
>
> RAID 10 is as secure, and risk free, and much faster.
> And will cause much less CPU load.
>
Well, with both a pair of RAID1 arrays and a pair of RAID-10 arrays, you
can lose 2 disks without losing data, but only if the right 2 disks fail.
With RAID6, any two of the four can fail without data loss.
(I still prefer RAID-10 over RAID-6 unless space is at an absolute
premium. But for a four-disk setup, net disk space is the same and it's
just a question of whether you want the speed of RAID-10 or the
reliability of RAID-6.)
next prev parent reply other threads:[~2011-06-07 23:59 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-07 18:12 from 2x RAID1 to 1x RAID6 ? Stefan G. Weichinger
2011-06-07 20:07 ` Maurice Hilarius
2011-06-07 23:59 ` Thomas Harold [this message]
2011-06-08 8:06 ` Stefan G. Weichinger
2011-06-08 9:38 ` David Brown
2011-06-08 10:11 ` John Robinson
2011-06-08 10:33 ` David Brown
2011-06-08 14:20 ` Phil Turmel
2011-06-08 14:42 ` Stefan G. Weichinger
2011-06-09 13:18 ` Nikolay Kichukov
2011-06-09 13:42 ` David Brown
2011-06-08 1:16 ` John Robinson
2011-06-08 8:16 ` Stefan G. Weichinger
2011-06-08 9:43 ` David Brown
2011-06-08 12:31 ` Stefan G. Weichinger
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