On Sat, 2005-06-11 at 14:42 -0400, Mike Jakubik wrote: > Can someone explain tome the difference between a RAID1 setup done via > atacontrol and gmirror? I have a VIA 6420 SATA150 controller, which also > has raid, but is not supported by -stable.
Here are the main differences, as I see them: atacontrol RAID: - Only for ATA; - Compatible with quite a few ATA RAID card BIOS metadata formats, hence you can create the RAID using the RAID controller's BIOS menu; - Supports only two-way mirroring (IIRC); - Supports spares. gmirror: - Works with any GEOM provider (ATA, SCSI, ggate, etc.); - Uses the last sector of each RAID component to store its own metadata; - Supports N-way mirroring; - Does not support spares (though gmirror activate/deactivate can be used to associate a component with a mirror somewhat akin to having a spare). I found array rebuilding to be troublesome on atacontrol RAID---so much so I abandoned it and used vinum and then gmirror instead for my RAID 1. (I have a bootable geom_mirror setup, now.) Mind you, that was in the pre-ATA mk.III days, and I hear the RAID support underwent a big revamp in the mk.III rewrite. Cheers, Paul. -- e-mail: [EMAIL PROTECTED] "Without music to decorate it, time is just a bunch of boring production deadlines or dates by which bills must be paid." --- Frank Vincent Zappa _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"