Date: Sat, 14 Feb 1998 13:38:47 +0900 (JST) From: Michael Hancock <michaelh@cet.co.jp> To: Greg Lehey <grog@lemis.com> Cc: freebsd-fs@FreeBSD.ORG Subject: Re: ccd and ftd Message-ID: <Pine.SV4.3.95.980214132603.12346A-100000@parkplace.cet.co.jp> In-Reply-To: <19980214120247.43100@freebie.lemis.com>
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On Sat, 14 Feb 1998, Greg Lehey wrote: > On Sat, 14 February 1998 at 10:19:49 +0900, Michael Hancock wrote: > > I'm looking for a fault tolerant solution. I know Greg is working on a > > ftd driver. > > > > In the meantime I noticed that ccd supports mirroring. I'd like to mirror > > two arrays of 3 to 4 disk each. How well does this work? > > Do you mean more than one mirror? I don't believe that works. > Certainly I can't see how it can from reading the code. The man pages says you can mirror any even number of disks. What I'd like to do is this: 2940 - disk1 - disk2 - disk3 - disk4 and mirror/duplex the whole array with another identical array. 2940 - disk5 - disk6 - disk7 - disk8 Interestingly, man ccdconfig talks about CCDF_MIRROR and an unimplemented flag CCDF_PARITY. Although, it looks like they have hooks for more fault-tolerant features in ccd I agree with your effort to make a separate fault-tolerant driver and keeping the ccd a light-weight, primarily for striping-only driver. Are you going to be able to share some code with it? Regards, Mike Hancock To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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