Date: Tue, 10 Jun 2008 18:24:52 +0300 From: Manolis Kiagias <sonicy@otenet.gr> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: freebsd-questions@freebsd.org, DA Forsyth <iwrtech@iwr.ru.ac.za> Subject: Re: xRAID disks.... Message-ID: <484E9CC4.8000904@otenet.gr> In-Reply-To: <20080610171352.T75322@wojtek.tensor.gdynia.pl> References: <484EACEB.7169.43FE1258@iwrtech.iwr.ru.ac.za> <20080610145926.GA66984@owl.midgard.homeip.net> <484E9925.2050507@otenet.gr> <20080610171352.T75322@wojtek.tensor.gdynia.pl>
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Wojciech Puchar wrote: >> >> I recently removed one pair of disks from a windows "hardware :)" >> RAID controller, and upon inserting it into a newly built FreeBSD >> system, it was immediately detected by the ar driver, and messages >> started coming in, like > > is there actually any difference in ar and gmirror/gstripe except that > ar is simpler, takes only whole drives and use "hardware RAID ;)" > compatible headers ? > >> make the disks forget about their previous RAID-life: >> >> atacontrol delete ar0 >> >> Have a look at man atacontrol. I have not tried it, but it is >> probably worth a try. > > I've used gmirror on several occasions, and it works well for me. I have never used ar, but as I understand this is limited to ata disks (hence ar=atapi raid). The geom framework probably provides a lot more features and is not limited the way ar is. I would not mind using ar in this particular system, but I moved disks one by one, erasing the first one (ar was still complaining about the other one missing after I erased it) and when I later added the second one, I got a kernel panic. Mind you, the ar "signature" or whatever was written in a windows system and may not have been exactly compatible. I removed ar from the kernel and continued with my usual gmirror stuff (which works flawlessly)
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