Date: Sun, 24 Mar 2002 12:36:13 -0500 (EST) From: Robert Watson <rwatson@freebsd.org> To: "Karsten W. Rohrbach" <karsten@rohrbach.de> Cc: freebsd-fs@freebsd.org, freebsd-bugs@freebsd.org Subject: Re: Soft update instability with heavy IO and offboard IDE controller Message-ID: <Pine.NEB.3.96L.1020324123436.47668h-100000@fledge.watson.org> In-Reply-To: <20020324182436.B79192@mail.webmonster.de>
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On Sun, 24 Mar 2002, Karsten W. Rohrbach wrote: > Robert Watson(rwatson@freebsd.org)@2002.03.24 09:22:47 +0000: > > > I have to say that my answer on the ATA write caching is a UPS. :-) > > i hope, this is not meant seriously. an ups keeps your system running in > case of mains power outage, true. it does not help anything in the > following (common) scenarios: > - the power supply blows > - bad power cable > - neutron bombs ;-) > > honestly, judging from the quality of hardware you get in .de the first > two things happen more often than a real power outage, so i'd say an ups > is no viable solution when enabling ata wc. it may give you a warm fuzzy > feeling, but that's about it :-) > > just my EUR 0.02, in case something makes it a FAQ to go into the > handbook... In my area, power grid failure is a real problem, far more likely than power supply failure, unfortunately. Obviously, in the end, it's a tradeoff regarding performance and reliability. If you want real reliability, you have to buy hardware that actually behaves the way the software expects. I don't think anyone would be surprised if a future generation of IDE disks ignored the 'write cache disable' setting to gain performance. Robert N M Watson FreeBSD Core Team, TrustedBSD Project robert@fledge.watson.org NAI Labs, Safeport Network Services To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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