Date: Thu, 17 May 2001 14:45:02 -0700 From: Drew Tomlinson <drewt@writeme.com> To: 'Greg Lehey' <grog@lemis.com> Cc: "FreeBSD Questions (E-mail)" <freebsd-questions@FreeBSD.org> Subject: RE: www.vinumvm.org Message-ID: <BA5D0CE1CBB2D411B6AA00A0CC3F02390AF9EF@ldcmsx01.lc.ca.gov> In-Reply-To: <20010516114223.C35292@wantadilla.lemis.com>
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> -----Original Message-----
> From: Greg Lehey [mailto:grog@lemis.com]
> Sent: Tuesday, May 15, 2001 7:12 PM
> To: Drew Tomlinson
> Cc: FreeBSD Questions (E-mail)
> Subject: Re: www.vinumvm.org
[snip]
> >>> I am trying to setup vinum on my 4.3 system for the first time and
> >>> need some help as I'm not understanding this very well.
> >>> Specifically, I have 3 4.3G drives with a 100M root
> partition on the
> >>> first and a 192M swap partition on the other two. The
> remainder of
> >>> the first drive has a second partition mounted as /usr. What I
> >>> would really like to have to keep the 100M root partition (only
> >>> because ASFAIK one can't use vinum on root) and have a
> striped 384M
> >>> swap and the remainder all of the space on all of the
> drives as one
> >>> large striped partition mounted as /usr. Is this possible?
> >>
> >> Only if all the Vinum drives (partitions) are thee same size.
> >
> > How would I do that? Take a backup of /usr, then delete it, create
> > my Vinum drive, and then restore it? Or is there a better way?
> > What "gotchas" might I come across?
>
> Well, in fact, all you need is to have same-sized subdisks. But if
> you only want one volume, you'd have space left over if the drives
> weren't all the same size.
>
> The trick way to turn /usr into a Vinum volume is to make swap 265
> sectors longer when installing, then place /usr immediately after
> swap. After installation, reboot in single user mode, shorten swap by
> 265 sectors and make an overlapping Vinum drive start there. The real
> /usr will then be at the beginning of the subdisk space, so you just
> need to define a plex with the same location as the /usr partition.
> I'll write this up in more detail some day.
I don't know much about drive geometry but I decided to give this a try. I want
a 100M root partition, 384M of total swap space, and the rest in a large stripe
set for /usr. I have 3 identical 4.3G drives in this system and labeled them as
follows:
da0s1:
# size offset fstype [fsize bsize bps/cpg]
a: 204800 0 4.2BSD 1024 8192 16 # (Cyl. 0 - 12*)
b: 127232 204800 swap # (Cyl. 12*- 20*)
c: 8380080 0 unused 0 0 # (Cyl. 0 - 521*)
e: 8048048 332032 4.2BSD 1024 8192 16 # (Cyl. 20*- 521*)
da1s1 & da2s1:
# size offset fstype [fsize bsize bps/cpg]
b: 331776 0 swap # (Cyl. 0 - 20*)
c: 8380080 0 unused 0 0 # (Cyl. 0 - 521*)
e: 8048304 331776 4.2BSD # (Cyl. 20*- 521*)
Next I installed the 4.3-RELEASE with da0s1e as /usr. The install was
successful.
Now I have rebooted into single user mode. Without mounting /usr, I am unable to
use disklabel as vi is not found. I tried copying vi to /, setting EDITOR to
reflect the change, and then running disklabel. But vi complained about not
finding some "ELF" library on /usr/share. So I mounted /usr and was able to
shorten swap on da0 but because da0s1e is mounted as /usr, I can't lengthen it
and change the fstype to "vinum" It now looks like this:
# size offset fstype [fsize bsize bps/cpg]
a: 204800 0 4.2BSD 1024 8192 16 # (Cyl. 0 - 12*)
b: 126976 204800 swap # (Cyl. 12*- 20*)
c: 8380080 0 unused 0 0 # (Cyl. 0 - 521*)
e: 8048048 332032 4.2BSD 1024 8192 16 # (Cyl. 20*- 521*)
I did change the disklabel on both da1 and da2. They are the same and look like
this:
# size offset fstype [fsize bsize bps/cpg]
b: 331776 0 swap # (Cyl. 0 - 20*)
c: 8380080 0 unused 0 0 # (Cyl. 0 - 521*)
e: 8048304 331776 vinum # (Cyl. 20*- 521*)
And when I get the partition tables right, I plan to use this configuration file
to create my vinum volume for /usr:
drive disk1 device /dev/da0e
drive disk2 device /dev/da1e
drive disk3 device /dev/da2e
volume user
plex org striped 300k
sd length 3929m drive disk1
sd length 3929m drive disk2
sd length 3929m drive disk3
So where do I go from here? Am I close? I suspect that I need to change the
label on da0s1e to fstype vinum, add 256 to the size, and subtract 256 from the
offset. Then I can create my vinum volume. Is this correct? If so, how can I
edit the partition that /usr lives on. I can't when /usr is mounted and I can't
run the disklabel utility when /usr isn't mounted.
If this is more that you bargained for when answering my cry for help and you
don't have time for this, I certainly understand. Just tell me to go away and I
will quit bothering you. I appreciate your time and help that you've already
given me.
Thanks,
Drew
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