Date: Wed, 28 Apr 2004 21:00:12 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Chris Collins <collins@collins-ca.com> Cc: freebsd-questions@freebsd.org Subject: Re: Installing RAID question.[Scanned] Message-ID: <20040428200012.GB41156@happy-idiot-talk.infracaninophile.co.uk> In-Reply-To: <20040428164503.M79217@collins-ca.com> References: <20040428125933.M1798@collins-ca.com> <01a301c42d34$3efbdfa0$12c79384@enfield.ac.uk> <20040428164503.M79217@collins-ca.com>
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On Wed, Apr 28, 2004 at 12:07:34PM -0500, Chris Collins wrote:
> That is a good tip... I will be sure to "wire down" the new Raid config.=
=20
>=20
> Just one more question... my current setup has ad0s1a for / So ad0 is the=
=20
> physical drive definition(controller) and s1a is the logical partition???=
and=20
> if I was to add the raid card it might chage to something like this=20
> sc0s1a ??? Is this safe to assume? Sorry just trying to understand how th=
is=20
> all functions...=20
>=20
> This is my current fstab=20
>=20
> /dev/ad0s1b none swap sw 0 0
> /dev/ad0s1a / ufs rw 1 1
> /dev/ad0s1f /tmp ufs rw 2 2
> /dev/ad0s1g /usr ufs =20
> rw,userquota,groupquota 2 2
> /dev/ad0s1e /var ufs rw,userquota 2 2
> /dev/acd0c /cdrom cd9660 ro,noauto 0 0
> proc /proc procfs rw 0 0
>=20
> So my new one would look like this??? if sc0 was the new controller id.
>=20
> /dev/sc0s1b none swap sw 0 0
> /dev/sc0s1a / ufs rw 1 1
> /dev/sc0s1f /tmp ufs rw 2 2
> /dev/sc0s1g /usr ufs =20
> rw,userquota,groupquota 2 2
> /dev/sc0s1e /var ufs rw,userquota 2 2
> /dev/scd0c /cdrom cd9660 ro,noauto 0 0
> proc /proc procfs rw 0 0
>=20
Right -- so you're not just putting in a new raid card, you're moving
your boot drive onto that card as well.
'sc0' won't be the controller ID -- sc is the System Console driver --
but, yes if the raid controller will accept a previously initialised
disk, then the change mapping ad0 onto some other device node as you
show could work. I wouldn't say that's 100% safe to assume, but
you've a reasonable chance of having that work.
The CD Rom device will however stay at /dev/acd0c
Seeing as you're putting in an ATA Raid card, ignore everything I said
about wiring down device names. That works for SCSI devices, not
ATA/ATAPI.
The device name 'ad0s1a' breaks down as: ad (ATA Drive) 0 (ie. master
on primary bus), s1 (first slice), a (partition a)=20
Cheers,
Matthew
--=20
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
Savill Way
PGP: http://www.infracaninophile.co.uk/pgpkey Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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