Re: Software RAID10 - which two disks can fail?

To: debian-user@lists.debian.org
Subject: Re: Software RAID10 - which two disks can fail?
From: Gary Dale <garydale@torfree.net>
Date: Tue, 08 Apr 2014 09:05:24 -0400
Message-id: <[🔎] 5343F414.3090804@torfree.net>
Reply-to: gary@extremeground.com
In-reply-to: <[🔎] li0ri3$r65$1@ger.gmane.org>
References: <[🔎] CAHd9_iQHpAVKeN8KEBF=5PgKna4uUp0TvjseJ5NUjugaC7q0Fw@mail.gmail.com> <[🔎] 53437300.8020406@velcom.ca> <[🔎] li0ri3$r65$1@ger.gmane.org>

On 08/04/14 08:54 AM, Valerio Vanni wrote:

"Gary Dale" <garydale@velcom.ca> ha scritto nel messaggio
[🔎] 53437300.8020406@velcom.ca">news:[🔎] 53437300.8020406@velcom.ca

IMHO this is a bad setup. Because you are reading and writing to
multiple disks at at time, you may have some speed-up, but you only
get half the total space. And you are vulnerable to some two-disk
failures. If you went to RAID-6, you'd get the same basic performance
and space
but would be immune to two-disk failures.

But RAID-5 and RAID-6 require more computational power.
RAID6 has to generate 2 parities.

Largely irrelevant. The computational power in creating RAID 6 paritybits is minuscule for today's processors.

Reply to:

References:
- Software RAID10 - which two disks can fail?
  - From: Rafał Radecki <radecki.rafal@gmail.com>
- Re: Software RAID10 - which two disks can fail?
  - From: Gary Dale <garydale@velcom.ca>
- Re: Software RAID10 - which two disks can fail?
  - From: "Valerio Vanni" <valerio@valeriovanni.com>

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