Date: Sat, 19 Jan 2013 17:24:10 -0800 (PST) From: Don Lewis <truckman@FreeBSD.org> To: wojtek@wojtek.tensor.gdynia.pl Cc: scott4long@yahoo.com, freebsd-hackers@FreeBSD.org, dieterbsd@gmail.com, scottl@FreeBSD.org, gibbs@FreeBSD.org, mjacob@FreeBSD.org Subject: Re: IBM blade server abysmal disk write performances Message-ID: <201301200124.r0K1OAld019768@gw.catspoiler.org> In-Reply-To: <alpine.BSF.2.00.1301181909250.12638@wojtek.tensor.gdynia.pl>
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On 18 Jan, Wojciech Puchar wrote: > If computer have UPS then write caching is fine. even if FreeBSD crash, > disk would write data I've had my share of sudden UPS failures over the years. Probably more than half have been during an automatic battery self test. UPS goes on battery, and then *boom*, everything shuts down. At that point the UPS helpfully indicates that the battery needs to be replaced. This seems to happen more frequently once the batteries get to be about 4 years old. I've started replacing them after 3 years. My next big build will have redundant PSUs, each connected to a separate UPS.
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