Date: Fri, 02 Oct 1998 14:20:26 -0600 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: Julian Elischer <julian@whistle.com> Cc: "Justin T. Gibbs" <gibbs@plutotech.com>, Don Lewis <Don.Lewis@tsc.tdk.com>, current@FreeBSD.ORG Subject: Re: Softupdates, filesystem safety and SCSI disk write caching Message-ID: <199810022026.OAA17722@pluto.plutotech.com> In-Reply-To: Your message of "Fri, 02 Oct 1998 13:12:57 PDT." <Pine.BSF.3.95.981002125605.15828C-100000@current1.whistle.com>
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>Of course.. All I'm saying is that It is a prerequisite that we should >document somewhere, that "Softupdates assumes that completion signals the >arrival of the data into STABLE storage, e.g. magnetic recording." If we tagged meta-data buffers appropriately, we could specificly inhibit write-caching those transactions. I would expect this to give you the semantics soft-updates expects while still allowing the disk to write cache data blocks. So, if you have a power failure, the file-system meta-data would be consistent, but some files might have stale data blocks. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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