Date: Sun, 03 Apr 2011 18:20:27 +0100 From: Bruce Cran <bruce@cran.org.uk> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: freebsd-stable@freebsd.org Subject: Re: Constant rebooting after power loss Message-ID: <4D98AC5B.1050606@cran.org.uk> In-Reply-To: <201104020335.p323Zp8Q018666@apollo.backplane.com> References: <87d3l6p5xv.fsf@cosmos.claresco.hr> <AANLkTi=kEyz-mKLzdV8LAf91ZhMTP8gLKs=3Eu5WD8mh@mail.gmail.com> <874o6ip0ak.fsf@cosmos.claresco.hr> <7b15d37d28f8ddac9eb81e4390231c96.HRCIM@webmail.1command.com> <AANLkTi=KEwmm1hM6Z=r_SWUAn9KhUrkTVzfF6VmqQauW@mail.gmail.com> <14c23d4bf5b47a7790cff65e70c66151.HRCIM@webmail.1command.com> <AANLkTi=6pqRwJ96Lg=603cYg_f8QUXkg8aXtbjbYpFrV@mail.gmail.com> <201104020335.p323Zp8Q018666@apollo.backplane.com>
index | next in thread | previous in thread | raw e-mail
On 02/04/2011 04:35, Matthew Dillon wrote: > First, a power loss to the drive will cause the drive's dirty write cache > to be lost, that data will not make it to disk. Nor do you really want > to turn of write caching on the physical drive. Well, you CAN turn it > off, but if you do performance will become so bad that there's no point. > So turning off the write caching is really a non-starter. Do you know if that's changed at all with NCQ on modern SATA drives? I've seen people commenting that using tags recovers most, if not all, of the performance lost by disabling the write cache. -- Bruce Cranhelp
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4D98AC5B.1050606>