Date: Mon, 26 Aug 1996 11:30:49 -0700 From: "Michael L. VanLoon" <michaelv@MindBender.serv.net> To: Joe Greco <jgreco@brasil.moneng.mei.com> Cc: michael@memra.com, freebsd-isp@freebsd.org, craigs@os.com Subject: Re: Anyone using ccd (FreeBSD disk striper) for news Message-ID: <199608261830.LAA16588@MindBender.serv.net> In-Reply-To: Your message of Mon, 26 Aug 96 12:45:04 -0500. <199608261745.MAA00687@brasil.moneng.mei.com>
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>> >> And did you need to fo that tweak to UFS meta data updates that makes it
>> >> more like Linux's ext2fs?
>> >I've played with metadata updates before (disabled ATIME and MTIME updates)
>> >but I don't want to do it on a production system until there is an
>> >officially sanctioned method to do so.
>> On the other hand, I've had two NetBSD machines running with all
>> filesystems in async mode for several months, now. One of these
>But async mode will not buy you much in this case...! Async is simply
>delaying the inevitable, which is already delayed in FreeBSD until the next
>30-second sync. I do not want to write metadata at _all_ if all it is is
>an ATIME update... if I have to write it, now OR later, I am losing
>bandwidth and transactions per second that I would rather spend reading
>other data.
Not completely. What if the data that is being postponed changes two
or three times while it's in the cache. When it finally gets written,
you just wrote once what would have been written two or three more
times.
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Michael L. VanLoon michaelv@MindBender.serv.net
--< Free your mind and your machine -- NetBSD free un*x >--
NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3,
Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32...
NetBSD ports in progress: PICA, others...
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