Date: Fri, 24 Mar 2000 11:27:25 -0500 (EST) From: Zhihui Zhang <zzhang@cs.binghamton.edu> To: Mike Smith <msmith@FreeBSD.ORG> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Software RAID and vinum Message-ID: <Pine.GSO.3.96.1000324110754.1834B-100000@sol.cs.binghamton.edu> In-Reply-To: <200003241826.KAA00964@mass.cdrom.com>
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On Fri, 24 Mar 2000, Mike Smith wrote: > > > > I searched the mailing list archive. I am not sure whether Vinum has > > solved the problem of atomic writes in a stripe to both the data fragment > > and parity fragment (RAID 5). In the case of a crash, you have no idea of > > where the writes have finished (even worse, a fragment may contain > > several sectors). > > This problem can't be solved with software-only RAID, and no (sensible) > software RAID implementation attempts to deal with it. Software RAID > reliability is predicated on the correct functioning of the system; it's > there to provide fault tolerance for the high-failure-rate hardware (eg. > disks). Thanks. It seems to me that you are saying software RAID can NOT cope with system crash and power failure? What about the Zebra filesystem or something like two-phase commit? -Zhihui To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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