Date: Fri, 29 Jul 2005 15:28:31 +0100 (BST) From: "Angus MacGyver" <macgyver@calibre-solutions.co.uk> To: "Pawel Jakub Dawidek" <pjd@FreeBSD.org> Cc: freebsd-alpha@freebsd.org Subject: Re: Gmirror + AXP + 5.4.. (was Vinum + AXP + 5.4) Message-ID: <40377.193.131.192.94.1122647311.squirrel@webmail.calibre-solutions.co.uk> In-Reply-To: <20050727205850.GS46538@darkness.comp.waw.pl> References: <1121674263.5897.5.camel@falcon.calibre-solutions.co.uk> <20050718100353.GH53035@cicely12.cicely.de> <1121681574.5897.7.camel@falcon.calibre-solutions.co.uk> <1122398630.5860.7.camel@yavin4.calibre-solutions.co.uk> <20050726201815.GI46538@darkness.comp.waw.pl> <1122411849.5860.12.camel@yavin4.calibre-solutions.co.uk> <20050726212616.GL46538@darkness.comp.waw.pl> <1122446849.5860.25.camel@yavin4.calibre-solutions.co.uk> <20050727070537.GM46538@darkness.comp.waw.pl> <20050727084648.GC10772@calibre-solutions.co.uk> <20050727205850.GS46538@darkness.comp.waw.pl>
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Pawel Jakub Dawidek said:
> On Wed, Jul 27, 2005 at 09:46:48AM +0100, Angus MacGyver wrote:
> +> On Wed, Jul 27, 2005 at 09:05:37AM +0200, Pawel Jakub Dawidek wrote:
> +> > On Wed, Jul 27, 2005 at 07:47:29AM +0100, Angus MacGyver wrote:
> +> > +> My fstab only has refereence to / as /dev/mirror/md0 and nothing
> else.
> +> > +>
> +> > +> /dev/mirror/md0 / ufs rw 1 1
> +> >
> +> > But could you mount /dev/mirror/md0 on /mnt and confirm that
> +> > / is /dev/mirror/md0 in /mnt/etc/fstab?
> +>
> +>
> +> and one hears the sound of a slap on the forehead......
> +> DOH!
> +>
> +> I'd newfs'd /dev/mirror/md0 and then dumped / to this, BEFORE i'd
> changed the fstab to point to /dev/mirror/md0....
> +>
> +> When the machine booted and picked up the fstab from /dev/da0a, it was
> pointing / at /dev/da1a, from which is read /etc/fstab for all the other
> mounts, which then mounted as expected....
> +>
> +>
> +> Talk about muppetry...
> +>
> +> I now have...
> +>
> +>
> +> /dev/mirror/md0 on / (ufs, local, soft-updates)
> +> devfs on /dev (devfs, local)
> +> /dev/mirror/md2 on /var (ufs, local, soft-updates)
> +> /dev/mirror/md3 on /tmp (ufs, local, soft-updates)
> +> /dev/mirror/md4 on /usr (ufs, local, soft-updates)
> +> /dev/mirror/md5 on /data (ufs, local, soft-updates)
> +> procfs on /proc (procfs, local)
> +>
> +> Precisely what I'd expected...
> +>
> +> Thanks for all your help ;-)
>
> No problem, good to hear to works fine:)
'Cept i have now has UFS panics...
Upon creating a jail using Ths Lab's webmin insert, and creating a disk
based install, of which there are already 3 created and installed..
/data/test: bad dir ino 60 at offset 0: mangled entry
panic: ufs_dirbad: bad dir
Uptime: 3h21m13s
... and so starts a reboot..
NOW..
Question i have to ask is this, as I cannot find a clear statement, and
"man gmirror" only appears to hint at the metadata...
I installed using sysinstall, and split the disk thus..
corse# bsdlabel /dev/da0
# /dev/da0:
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 524288 0 4.2BSD 2048 16384 32776
b: 2099200 524288 4.2BSD 2048 16384 28528
c: 35843670 0 unused 0 0 # "raw" part,
don't edit
d: 1048576 2623488 4.2BSD 2048 16384 8
e: 1048576 3672064 4.2BSD 2048 16384 8
f: 7340032 4720640 4.2BSD 2048 16384 28528
g: 23782998 12060672 4.2BSD 2048 16384 28528
I then copied this label to the second drive and setup the mirrors as
described earlier.
(for those that didnt see it....)
corsec# gmirror status
Name Status Components
mirror/md0 COMPLETE da0a
da1a
mirror/md1 COMPLETE da0b
da1b
mirror/md2 COMPLETE da0d
da1d
mirror/md3 COMPLETE da0e
da1e
mirror/md4 COMPLETE da0f
da1f
mirror/md5 COMPLETE da0g
da1g
i.e. for each side of the mirror, I am using an identically sized slice
(partition/lump) of each disk..
Now, question is, where does it store the metadata ?
Manual says last sector.
Ok, so in my case, is that last sector of c? (the whole disk), for ALL
mirror devices, or the last sector of each slice on each disk ???
So what happens when disks ineveitably get full, is the metadata "safe" ?
Or would I be best off starting again, and creating a mirror device that
has the ENTIRE disk as the device, and then slice that mirror device up
for /, /var /usr etc...
I am used to Solaris Disk Suite's mirroring, and we setup a slice on each
disk JUST to keep the metadata in, so this causing me some brain troubles
at the moment..
Most of the "howto" doc are x86 and only for IDE devices, neither of which
I am using.
Cheers
AM
--
I ain't perfect ...
...Yet
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