Date: Mon, 13 Jun 2005 11:14:03 -0700 From: Jon Simola <jsimola@gmail.com> To: stable@freebsd.org Subject: Re: atacontrol raid1 vs. gmirror Message-ID: <8eea0408050613111459f96599@mail.gmail.com> In-Reply-To: <1118519437.7105.16.camel@zappa.Chelsea-Ct.Org> References: <1379.172.16.0.199.1118515349.squirrel@172.16.0.1> <1118519437.7105.16.camel@zappa.Chelsea-Ct.Org>
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On 6/11/05, Paul Mather <paul@gromit.dlib.vt.edu> wrote:
> I found array rebuilding to be troublesome on atacontrol RAID
Some bits from the in-house documentation I've been writing. I've
tested this on multiple occasions on my 1U Supermicro SATA boxes, so
might possibly be interesting for someone.
* RAID setup: (If required, FreeBSD only)
- ensure that the drives are probed as ad4 and ad6 like:
ad4: 76324MB [155072/16/63] at ata2-master SATA150
ad6: 76324MB [155072/16/63] at ata3-master SATA150
- if they do not probe correctly, check the BIOS settings above
- perform a minimal install of FreeBSD 5.3 (do not worry about
network or anything)
- reboot from the installed OS and login as root
- Run the command "atacontrol create RAID1 ad4 ad6" to create the rai=
d set
- Reboot and reinstall the OS, choosing ar0 as the drive, which
should probe like:
ad4: 76324MB [155072/16/63] at ata2-master SATA150
ad6: 76324MB [155072/16/63] at ata3-master SATA150
ar0: 76324MB [9730/255/63] status: READY subdisks:
disk0 READY on ad4 at ata2-master
disk1 READY on ad6 at ata3-master
Minimal Survival for FreeBSD software RAID1 sets
* Read the atacontrol man page
* atacontrol status ar0 - to check the status
* atacontrol detach 2 - to detach ad4 if failed (again, use 3 for ad6).
The SATA disks in the 5013C-T chassis are hotswappable, so it
can be pulled once detached.
* atacontrol attach 2 - to reattach ad4 once replaced
* atacontrol addspare ar0 ad4 - to add the replaced ad4 as a spare
on the RAID set
* atacontrol rebuild ar0 - to rebuild the mirror=20
--=20
Jon Simola
Systems Administrator
ABC Communications
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