From: Tomasz Chmielewski <mangoo@wpkg.org>
To: linux-raid@vger.kernel.org
Subject: RAID-10 and 4 HDDs - how many HDDs can break without loosing data?
Date: Thu, 10 Aug 2006 10:48:01 +0200 [thread overview]
Message-ID: <44DAF2C1.2050308@wpkg.org> (raw)
I want to set up RAID-10 on 4 400 GB drives, on not-so powerful machine
(600 MHz ARM, Thecus n4100) - to have a total of 800 GB storage, with
some protection against a drive failure.
As the machine is not very powerful, I don't want to use RAID-5 nor RAID-6.
Previously, I would use RAID-0 on top of two RAID-1s:
----RAID0----
| |
RAID1 RAID1
| | | |
HDD1 HDD2 HDD3 HDD4
With RAID-0 on top of RAID-1, with 4 drives, I would achieve:
- 100% chance of recovery if any single, one disk fails,
- 50% chance of recovery if any two disk failure.
Now with RAID-10 in the Linux kernel, what are my chances of recovering
from a single and two disk failure?
RAID10
------------------
| | | |
HDD1 HDD2 HDD3 HDD4
Is it also 100% if one disk fails, and 50% if two disks fail?
Or perhaps, with 4 drives, RAID-10 can survive any 2 disks failure?
--
Tomasz Chmielewski
http://wpkg.org
next reply other threads:[~2006-08-10 8:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-10 8:48 Tomasz Chmielewski [this message]
2006-08-14 21:48 ` RAID-10 and 4 HDDs - how many HDDs can break without loosing data? Andrew Rechenberg Lists
-- strict thread matches above, loose matches on Subject: below --
2006-08-10 8:49 Tomasz Chmielewski
2006-08-10 10:39 ` Luca Berra
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