Date: Sat, 27 Mar 1999 19:32:06 +1030 From: Greg Lehey <grog@lemis.com> To: kiril@idea.co.uk, freebsd-questions@FreeBSD.ORG Subject: Re: vinum with MANY parts Message-ID: <19990327193206.D53452@lemis.com> In-Reply-To: <199903251729.RAA18994@idea.co.uk>; from Kiril Mitev on Thu, Mar 25, 1999 at 05:29:24PM %2B0000 References: <199903251729.RAA18994@idea.co.uk>
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On Thursday, 25 March 1999 at 17:29:24 +0000, Kiril Mitev wrote:
> Hi All
>
> This is what i am trying to do...
> I have 2 disks of 4gb and 2 disks of 8gb, and i am
> trying to make them into 1 big volume...
>
> questions :-)
> 1. my understanding is that if more than one plex is in
> a volume, these plexes (en) become mirrors, right ?
Yes.
> 2. so, all 4 disks should be in one plex, right ?
Almost. The *contents* of the drives should be in one plex. You need
to create a subdisk which uses up all the space in a drive, and add
that to the plex.
> 3. i should be able to 'concat' all 4 disks into a plex, right ?
Yes.
> 4. is it possible (if yes, how?) to set the equal-sized
> 'drives' to be striped ?
Well, not really, since you can only stripe plexes. And yes, each
subdisk of a striped plex must be the same size. I'll leave it as an
exercise for the reader to figure out how to make the subdisks the
same size :-)
Here's one possibility for the "one big volume" scenario:
drive 1 device /dev/da1e
drive 2 device /dev/da2e
drive 3 device /dev/da3e
drive 4 device /dev/da4e
volume everything
plex org concat
sd length 4g drive 1
sd length 4g drive 2
sd length 2g drive 3
sd length 2g drive 4
You don't say which version of Vinum you're planning to use, but there
has been a lot of work on -stable lately, and it'll be retrofitted to
-STABLE Real Soon Now, so unless you're using 2.2.8, you should get
the -CURRENT version from ftp://ftp.lemis.com/pub/vinum/ and test
that. It'll run on 3.1 and -STABLE as well. In a couple of days,
then, you can get the retrofitted version.
Greg
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