From: Miles Fidelman <mfidelman@meetinghouse.net>
Cc: linux-raid@vger.kernel.org
Subject: Re: possibly silly question (raid failover)
Date: Tue, 01 Nov 2011 16:13:26 -0400 [thread overview]
Message-ID: <4EB052E6.4050400@meetinghouse.net> (raw)
In-Reply-To: <j8p0g3$9r4$1@dough.gmane.org>
David Brown wrote:
>
> No, md RAID10 does /not/ offer more redundancy than RAID1. You are
> right that md RAID10 offers more than RAID1 (or traditional RAID0 over
> RAID1 sets) - but it is a convenience and performance benefit, not a
> redundancy benefit. In particular, it lets you build RAID10 from any
> number of disks, not just two. And it lets you stripe over all disks,
> improving performance for some loads (though not /all/ loads - if you
> have lots of concurrent small reads, you may be faster using plain
> RAID1).
wasn't suggesting that it does - just that it does things differently
than normal raid 1+0 - for example, by doing mirroring and striping as a
unitary operation, it works across odd number of drives - it also (I
think) allows for more than 2 copies of a block (not completely clear
how many copies of a block would be made if you specified a 16 drive
array) - sort of what I'm wondering here
--
In theory, there is no difference between theory and practice.
In<fnord> practice, there is. .... Yogi Berra
next prev parent reply other threads:[~2011-11-01 20:13 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-01 0:38 possibly silly question (raid failover) Miles Fidelman
2011-11-01 9:14 ` David Brown
2011-11-01 13:05 ` Miles Fidelman
2011-11-01 13:37 ` John Robinson
2011-11-01 14:36 ` David Brown
2011-11-01 20:13 ` Miles Fidelman [this message]
2011-11-01 21:20 ` Robin Hill
2011-11-01 21:32 ` Miles Fidelman
2011-11-01 21:50 ` Robin Hill
2011-11-01 22:35 ` Miles Fidelman
2011-11-01 22:00 ` David Brown
2011-11-01 22:58 ` Miles Fidelman
2011-11-02 10:36 ` David Brown
2011-11-01 22:15 ` keld
2011-11-01 22:25 ` NeilBrown
2011-11-01 22:38 ` Miles Fidelman
2011-11-02 1:40 ` keld
2011-11-02 1:37 ` keld
2011-11-02 1:48 ` NeilBrown
2011-11-02 7:02 ` keld
2011-11-02 9:20 ` Jonathan Tripathy
2011-11-02 11:27 ` David Brown
2011-11-01 9:26 ` Johannes Truschnigg
2011-11-01 13:02 ` Miles Fidelman
2011-11-01 13:33 ` John Robinson
2011-11-02 6:41 ` Stan Hoeppner
2011-11-02 13:17 ` Miles Fidelman
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