Date: Fri, 11 Oct 2002 14:42:42 +0200 From: "Lasse Laursen" <laursen@netgroup.dk> To: "Marc Perisa" <perisa@porsche.de> Cc: freebsd-stable@freebsd.org Subject: Re: Raid-1 and Vinum Message-ID: <02b801c27123$b18cbd60$1a01000a@area51> References: <020d01c27120$47746de0$1a01000a@area51> <3DA6C81B.9000102@porsche.de>
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Hi, I know how a RAID 1 works :) I was just interested in knowing if it would be possible to mount a single disk from the raid (the working part of the RAID 1) as a regular disk and access the data... It will hopefully never be used but it's nice to know our options :) (we have had some nasty accidents in the past...) Regards -- Lasse Laursen <laursen@netgroup.dk> - Systems Developer NetGroup A/S, St. Kongensgade 40H, DK-1264 København K, Denmark Phone: +45 3370 1526 - Fax: +45 3313 0066 - Web: www.netgroup.dk - We don't surf the net, we make the waves. ----- Original Message ----- From: "Marc Perisa" <perisa@porsche.de> To: "Lasse Laursen" <laursen@netgroup.dk> Cc: <freebsd-stable@freebsd.org> Sent: Friday, October 11, 2002 2:46 PM Subject: Re: Raid-1 and Vinum > Lasse Laursen wrote: > > Hi all, > > > > I have a small question regarding Vinum and Raid-1 that I hoped someone > > would be able to answer. > > > > We have a storagetak raid with 2 x 65 GByte RAID 5 arrays. We are going to > > mount both arrays under FreeBSD and then use software raid 1 (Vinum) to > > mirror the two raids (It's a single point of failure in a huge cluster so > > it's really important to never loose any data). > > > > We have several Linux systems running software raid 1 and if one of the > > disks fail in the mirror then the other disk can simply be mounted - is it > > the same procedure under FreeBSD? Eg. if one of the raids fail we will be > > able to mount the existing part of the raid as a regular disk? > > > > (please reply to my email address as well as to the list) > > > > Thanks in advance :) > > > > > > Regards > > > > > Hi Lars, > > as far as I understand Vinum you don't have to mount another disk to use > the mirror. > > It works as follows: > > define a mirrored RAID using Vinum > mount that mirrored RAID > write data to it > > If one mirror fails (in your case: your RAID-5 looses 2 disks at once) > Vinum will set that "device" (your array) to failed and continue > operations with a "degraded" RAID-1. No (re-)mounting needed. > > (Now stuff learned from looking while someone else has done it - not > from own experience:) If you bring that RAID-5 back online, you tell > Vinum to bring that back online (I think you have to fiddle through > disk, subdisk and plex config) and continue operations. > > Hope that helps > > Marc > > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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