From: Marc MERLIN <marc@merlins.org>
To: Hugo Mills <hugo@carfax.org.uk>,
Btrfs mailing list <linux-btrfs@vger.kernel.org>
Subject: Re: Thoughts on RAID nomenclature
Date: Mon, 5 May 2014 14:28:16 -0700 [thread overview]
Message-ID: <20140505212816.GT10159@merlins.org> (raw)
In-Reply-To: <20140505211738.GS24298@carfax.org.uk>
On Mon, May 05, 2014 at 10:17:38PM +0100, Hugo Mills wrote:
> Given these four (spread, dup, linear, grouped), I think it's
> fairly obvious that spread is a special case of grouped, where each
> device is its own group. Then dup is the opposite of grouped (i.e. you
> must have one or the other but not both). Finally, linear is a
> modifier that changes the sort order.
>
> All of these options run completely independently of the actual
> replication level selected, so we could have 3c:spread,linear
> (allocates on the first three devices only, until one fills up and
> then it moves to the fourth device), or 2c2s:grouped, with a device
> mapping {sda:1, sdb:1, sdc:1, sdd:2, sde:2, sdf:2} which puts
> different copies on different device controllers.
I generally like the idea and proposal :)
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/ | PGP 1024R/763BE901
next prev parent reply other threads:[~2014-05-05 21:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-05 21:17 Thoughts on RAID nomenclature Hugo Mills
2014-05-05 21:28 ` Marc MERLIN [this message]
2014-05-05 21:47 ` Brendan Hide
2014-05-06 20:51 ` Duncan
2014-05-06 20:16 ` Goffredo Baroncelli
2014-05-08 15:58 ` Hugo Mills
2014-05-08 21:55 ` Hugo Mills
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