From: Jeff Garzik <jeff@garzik.org>
To: Greg Freemyer <greg.freemyer@gmail.com>
Cc: Linda Walsh <suse@tlinx.org>, linux-ide@vger.kernel.org
Subject: Re: Port Multiplier access with Sil 3124
Date: Mon, 09 Feb 2009 19:15:10 -0500 [thread overview]
Message-ID: <4990C70E.1010707@garzik.org> (raw)
In-Reply-To: <87f94c370902091501h96ecb8dp7acac1fa80a82d8a@mail.gmail.com>
Greg Freemyer wrote:
> I'm hearing of people saying a 2 disk mirror (raid-1) is not safe
> enough. Go with either a 3 disk mirror or to raid-6. Even with
> raid-6 I personally would not let it have too many spindles. (Whatever
> too many means?)
IMO, RAID-1 was never safe. With RAID-1, one must rely solely on
"knowing" which RAID component is bad. With a completely dead drive,
this is obvious; with slowly creeping bad sectors, far less obvious.
Plus, the biggest crime, in my opinion, is the lack of checksumming or
any other method of actually verifying your data.
I've been waiting for years for someone to write RAID-1f... RAID-1 with
a hash function that writes checksums in a special metadata area (just
like the other pre-existing RAID metadata... a RAID partition is really
a just simple filesystem anyway).
That way you _know_ with 100% certainty that your data is OK (or not),
even if you only have a single drive.
Jeff
next prev parent reply other threads:[~2009-02-10 0:15 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-08 20:38 Port Multiplier access with Sil 3124 Linda Walsh
2009-02-09 9:26 ` Grant Grundler
2009-02-09 22:01 ` Linda Walsh
2009-02-09 14:35 ` Greg Freemyer
2009-02-09 20:09 ` Mark Lord
2009-02-09 22:22 ` Linda Walsh
2009-02-09 23:01 ` Greg Freemyer
2009-02-10 0:15 ` Jeff Garzik [this message]
2009-02-10 1:07 ` Linda Walsh
2009-02-10 3:48 ` Jeff Garzik
2009-02-11 2:09 ` Tejun Heo
2009-02-12 4:16 ` Robert Hancock
2009-02-10 3:25 ` Greg Freemyer
2009-02-11 2:12 ` Tejun Heo
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