Date: Sun, 29 Jul 2012 18:47:51 +0700 From: Erich Dollansky <erichfreebsdlist@ovitrap.com> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: RW <rwmaillists@googlemail.com>, freebsd-questions@freebsd.org Subject: Re: FreeBSD on SSD Message-ID: <20120729184751.46b9d3a6@AMD620.ovitrap.com> In-Reply-To: <alpine.BSF.2.00.1207291305220.3860@wojtek.tensor.gdynia.pl> References: <CAMxhPyt-gF228nX0DNrdsFVXKVx6YjZVa7obfov5vf%2BdtV71zw@mail.gmail.com> <alpine.BSF.2.00.1207281229260.6801@wojtek.tensor.gdynia.pl> <CAKB6gVgEyvVYaUvLkvE_AU-aViJxHAiLu6drcodLjOOBeNEYLg@mail.gmail.com> <CAMxhPysfghi-0ufy0OU0nonqha5mFeRacPVXM0MBDe6fqxmjUg@mail.gmail.com> <alpine.BSF.2.00.1207282016110.9859@wojtek.tensor.gdynia.pl> <20120729011426.0d31fe19@gumby.homeunix.com> <alpine.BSF.2.00.1207291305220.3860@wojtek.tensor.gdynia.pl>
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Hi, On Sun, 29 Jul 2012 13:06:35 +0200 (CEST) Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> wrote: > > From what I've read the cache is divided into two part. One part > > holds blocks that are consistently read during boot-ups. The other > > part holds > > how does it know when it is "bootup" and when it ends? after a reset signal, it assumes that the machine restarts. As the space is limited, it simply fills a fixed percentage with all the reads after a reset. > > >> documented. > > > > Well, it is intended to be completely transparent. > > transparency is one, documentation is another. Does it matter? It is a black box. > >> but does it clear SSD cache? > > > > That isn't guaranteed to clear any modern disk since they started > > using spare sectors > so? > So, no real difference. > >> i don't think so. Someone sophisticated > >> enough would perform raw read of cache chips and get cached data, > >> which can actually be the most important part > > > > If you're that paranoid use geli, or don't sell. > of course i use geli. and this is not a paranoia. What then? No Dobermann in the house? Erich
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