Date: Thu, 10 Oct 2002 13:06:48 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Scott Hess <scott@avantgo.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Mount option "nomtime"? Message-ID: <3DA5DDD8.3864BDCB@mindspring.com> References: <Pine.LNX.4.44.0210101011290.1689-100000@river.avantgo.com>
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Scott Hess wrote: > > That wouldn't make a difference, because the NetApp Filer would still > > schedule mtime updates for evey write access to the file that has been > > vnconfiged on the client. > > Probably talking through my hat, here, but doesn't NetApp use a LFS > (log-structured file system) variant? Almost. It's called WAFL, for "Write Anywhere File Layout". > In any case, assuming that I got the analysis right, that means the mtime > update should be essentially free, since it's already going to be writing > a new inode for the file to capture any new blocks written. Nope. The cost is not free. > http://www.netapp.com/tech_library/3001.html#I4, also note the Ousterhout > reference in the bibliography. An even stronger indicator is at > http://www.netapp.com/tech_library/3002.html#I35. Heh. You need to read your own references. 8-). -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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