Date: Tue, 14 Sep 2004 08:55:12 +0200 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> To: =?ISO-8859-1?Q?Eirik_=D8verby?= <ltning@anduin.net> Cc: current@freebsd.org Subject: Re: atacontrol and creating raid-1 arrays Message-ID: <414695D0.1020202@DeepCore.dk> In-Reply-To: <8AA611E5-05B1-11D9-831C-000D9335BCEC@anduin.net> References: <8AA611E5-05B1-11D9-831C-000D9335BCEC@anduin.net>
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Eirik Øverby wrote: > Hi, > > I have just done a 'cp /dev/ad4 /dev/ad6'. Those drives should be 100% > identical (even the same drive models). Will the command > 'atacontrol create RAID1 ad4 ad6' ruin the data on my drives? > > I ask because I am hoping to avoid the need for another 150 gigs of > space just to copy the data off of the drives before creating the array... "depends" Since the RAID metadata has to be put on disk it wont work if you have that area used for real data. Depending on what controller you use the metadata can be stored in different places. Other than that it works if you are *sure* the disks are identical (dd with a decnet blocksize is *much* faster tha cp). -Søren
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