Date: Wed, 27 May 1998 10:58:56 +0930 From: Greg Lehey <grog@lemis.com> To: Sabrina Minshall <sabrina@accesscom.com>, hackers@FreeBSD.ORG Subject: Re: vinum config Message-ID: <19980527105856.Y24133@freebie.lemis.com> In-Reply-To: <199805261918.MAA17546@shell.accesscom.com>; from Sabrina Minshall on Tue, May 26, 1998 at 12:18:27PM -0700 References: <199805261918.MAA17546@shell.accesscom.com>
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On Tue, 26 May 1998 at 12:18:27 -0700, Sabrina Minshall wrote:
> Greg,
> here's the config I have/want: 2 (2-gig) scsi hd's. Installed 2.2.6.
> partitions / - 200 MB. I want to allocate and mirror as follows:
>
> sd0 sd1 size
> --- --- ----
> / / 200Mb (can it be vinum too ?)
> swap swap vinum (200 MB)
> /usr /usr vinum (600 MB)
> /usr/src /usr/src vinum (100 MB)
> /u /u vinum (400 MB)
> /hw /hw vinum (500 MB)
>
> How do I go about configuring. I've read the docs
> but couldn't understand the mapping
> volume->plex->subdisks->drives?
Be warned that vinum is in very early testing at the moment. In fact,
I wouldn't recommend setting up a complete system on it at the moment.
But this is a good basis for an example.
First, why so many file systems? That's just asking for trouble (one
file system fills up, another is over full). For example, I don't
know what you'd ever do with a root file system of more than 50 MB,
and 100 MB looks far too small for /usr/src.
I haven't tried a root file system under vinum yet. I don't
anticipate any problems with vinum in doing it the way I describe, but
I don't know how to remount the file system. You need to boot from a
normal ufs file system, and then remount on the vinum file system.
I'm pretty sure that mount will currently refuse to do this.
Nevertheless, it's a good idea to set things up this way.
1. Label both disks in the same manner. Make partition h the same as
partition c, fs type "unused". Make partition a start at offset
265 sectors. This magic number represents the start of the first
volume within the vinum partition. Make it 200 MB long (your root
size).
2. Create the following config file:
drive drive1 device /dev/sd0h
drive drive2 device /dev/sd1h
volume roota
plex org concat
sd length 200m drive drive1
sd length 200m drive drive2
volume swap
plex org concat
sd length 200m drive drive1
sd length 200m drive drive2
volume usra
plex org concat
sd length 600m drive drive1
sd length 600m drive drive2
volume usrsrca
plex org concat
sd length 100m drive drive1
sd length 100m drive drive2
volume ua
plex org concat
sd length 400m drive drive1
sd length 400m drive drive2
volume hwa
plex org concat
sd length 500m drive drive1
sd length 500m drive drive2
3. Start vinum and create the file systems:
modload /lkm/vinum_mod.o
vinum create configfile
newfs /dev/vinum/rroota
newfs /dev/vinum/rusra
newfs /dev/vinum/rusrsrca
newfs /dev/vinum/rua
newfs /dev/vinum/rhwa
There are a number of minor problems with the configuration management
at the moment. I'm planning to have a new version at the end of the
week. You'll probably want to wait for that.
Greg
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