RE: RAID 0+1
> -Original Message- > From: Nejc Škoberne [mailto:[EMAIL PROTECTED] > Sent: Friday, May 23, 2008 2:06 AM > To: Ted Mittelstaedt > Cc: 'User Questions' > Subject: Re: RAID 0+1 > > > Hey, > > > don't use gmirror and atacontrol at the same time. Use one or > the other. > > I don't. As I said: > > > Then I would merge the second > > slice of all 4 drives into a 0+1 array (first gstriping and > > then gmirroring them). I somehow succeeded this, but I also > > get a WARNING when booting the system: > > So I am gstriping first and then gmirroring the stripes. > And I am getting this warning message: > > >> WARNING: Expected rawoffset 0, found 63 > > I don't know if I should worry about this or not. > You mentioned you used atacontrol to create the array, that's not part of gmirror. However in any case, you are not done. What you need to do now is write some data to the array, then unplug one of the sata connectors to the drive. The array will go into fault mode. Then you need to add the disk back in and see if the array will accept it, or if the array ends up scotching everything. A mirror is no good if it can't actually survive a fault. I used to do this when selling servers to HP Proliants. I'd have a customer with me and go to one of our production, running HP servers, eject a drive from the array, give it to the customer for inspection, then plug it back in. Other than the red light appearing on the drive for a few minutes, the rebuild operation was entirely in hardware, the server wouldn't even blink. If your array can't do that, your just basically technically masterbating with your system to feel good - it is in actuality a completely worthless mirror setup. Ted ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: RAID 0+1
Hey, don't use gmirror and atacontrol at the same time. Use one or the other. I don't. As I said: > Then I would merge the second > slice of all 4 drives into a 0+1 array (first gstriping and > then gmirroring them). I somehow succeeded this, but I also > get a WARNING when booting the system: So I am gstriping first and then gmirroring the stripes. And I am getting this warning message: WARNING: Expected rawoffset 0, found 63 I don't know if I should worry about this or not. Thanks, Nejc ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
RE: RAID 0+1
don't use gmirror and atacontrol at the same time. Use one or the other. Ted > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Nejc Škoberne > Sent: Thursday, May 22, 2008 1:51 AM > To: User Questions > Subject: RAID 0+1 > > Hello, > > I have FreeBSD 7.0 and 4 250GB SATA disks and I would like to > make one big 500GB > 0+1 RAID array. My hardware is HP ProLiant ML110G5. > > First I tried creating ATA RAID arrays with BIOS tools, but > FreeBSD wouldn't recognize the arrays. > > Than I decided to create the RAID-0 arrays with atacontrol. I > succeeded, ending up with ar0 and ar1 each 500GB big. My plan > was to install the FreeBSD as usual on ar0 and then add both > into a gmirror array. However, I BootMgr seem not to be able > to boot from RAID-0 array created with atacontrol? Is this > correct? I guess this is because BootMgr knows nothing about > striping and cannot read the kernel. > > Finally I tried to create two slices on each drive. The plan > was to join the first slice of all 4 drives into a gmirror > array and mount it as / partition (I guess BootMgr would boot > normally from such an array). Then I would merge the second > slice of all 4 drives into a 0+1 array (first gstriping and > then gmirroring them). I somehow succeeded this, but I also > get a WARNING when booting the system: > > ad0: 238475MB at ata0-master SATA150 > ad1: 238475MB at ata0-slave SATA150 > ad2: 238475MB at ata1-master SATA150 > GEOM_STRIPE: Device gs0 created (id=2160028923). > GEOM_STRIPE: Disk ad0s2 attached to gs0. > ad3: 238475MB at ata1-slave SATA150 > GEOM_STRIPE: Disk ad1s2 attached to gs0. > GEOM_STRIPE: Device gs0 activated. > GEOM_STRIPE: Device gs1 created (id=3269017453). > GEOM_STRIPE: Disk ad2s2 attached to gs1. > GEOM_MIRROR: Device mirror/gm0 launched (4/4). > GEOM_STRIPE: Disk ad3s2 attached to gs1. > GEOM_STRIPE: Device gs1 activated. > WARNING: Expected rawoffset 0, found 63 > GEOM_MIRROR: Device mirror/gm1 launched (1/2). > GEOM_MIRROR: Device gm1: rebuilding provider stripe/gs1. > > Is this critical? It looks like the system is fine, though. > > Is there any "more proper" way to build such a system with RAID 0+1? > > Thanks, > Nejc > > ___ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "[EMAIL PROTECTED]" > ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
