From: Laurent CARON <lcaron@apartia.fr>
To: Dan Stromberg <strombrg@dcs.nac.uci.edu>
Cc: linux-raid@vger.kernel.org
Subject: Re: RAID 5 of RAID 5's?
Date: Mon, 13 Jun 2005 09:15:39 +0200 [thread overview]
Message-ID: <42AD329B.4080103@apartia.fr> (raw)
In-Reply-To: <1118436219.25226.252.camel@seki.nac.uci.edu>
Dan Stromberg a écrit :
>On Fri, 2005-06-10 at 09:11 +0200, Laurent CARON wrote:
>
>
>>Dan Stromberg a écrit :
>>
>>
>>
>>>Has anyone constructed a RAID 5 of RAID 5's using mdadm on a linux
>>>system?
>>>
>>>Was it reliable?
>>>
>>>How large was it?
>>>
>>>Thanks!
>>>
>>>
>>>
>>>
>>>
>>Seems to be a large waste of space....
>>
>>
>
>Consider:
>
>You have a bunch of "bricks" that can shuffle data between a NAS head
>and a bunch of disks.
>
>The disks are RAID'd (through the "bricks"), but if one of the bricks
>themselves dies, you're kinda stuck.
>
>But if you RAID 5 the RAID 5's, then you don't end up with massive
>parity pounding, and your bricks aren't a single point of failure, and
>you don't lose as much space as if you mirrored.
>
>Sound copacetic?
>
>Thanks for your feedback!
>
>
>
RAID 10 is IMHO a bit more efficient.
Raid 5 means at least 9 disks:
Usable capacity: 4 Disks
Read speed: Good
Write speed: poor
Raid 10 with 8 disks can store the same amount of data.
Read speed: Average
Write Speed: Better than raid5
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next prev parent reply other threads:[~2005-06-13 7:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-07 23:39 RAID 5 of RAID 5's? Dan Stromberg
2005-06-10 7:11 ` Laurent CARON
2005-06-10 15:42 ` Brad Dameron
2005-06-10 20:43 ` Dan Stromberg
2005-06-12 0:45 ` Andy Smith
2005-06-13 17:55 ` Dan Stromberg
2005-06-13 7:15 ` Laurent CARON [this message]
2005-06-13 10:03 ` Andy Smith
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