Date: Wed, 27 Oct 1999 23:40:05 +0600 (ESS) From: Ilia Chipitsine <ilia@cgilh.chel.su> To: "Ronald G. Minnich" <rminnich@lanl.gov> Cc: Chuck Youse <cyouse@paradox.nexuslabs.com>, questions@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: why FFS is THAT slower than EXT2 ? Message-ID: <Pine.BSF.4.10.9910272334300.760-100000@localhost.cgu.chel.su> In-Reply-To: <Pine.SGI.4.10.9910271026500.671784-100000@acl.lanl.gov>
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-----BEGIN PGP SIGNED MESSAGE----- On Wed, 27 Oct 1999, Ronald G. Minnich wrote: > On Wed, 27 Oct 1999, Chuck Youse wrote: > > > One of the biggest reasons for the difference: FreeBSD, by default, > > performs _synchronous_ metadata updates, and Linux performs asynchronous > > metadata updates. > > > > It's definitely a bit slower, but the payoff is in reliability. I have > > seen more than one [production!] Linux machine completely trash its > > filesystems because the implementors decided that their "NT-killer" must > > have good performance at the expense of serious, production-quality > > reliability. > > > To put it slightly more strongly: as far as I'm concerned ext2 is not a as far as I remember ext2 has some "counter". I used to use Linux and it performed 'fsck' from time to time (even if fs was clearly unmounted). that is a very good thing to have. I do not recall that FreeBSD did such thing. > serious fs if you really care about handling power failures and other such > fun things. In clusters as small as 64 machines I've measured a 5% what is standard deviation equal to ? "lanl" means Los-Alamos National Laboratory ? > probability that after a power failure one of the 64 ext2 file systems > will have a trashed root file system. With freebsd, over a four-year span, > running through lots of power outages, I didn't lose an FFS file system I DID lose FFS even it was mounted "sync", not async. > even *once* (except for the disk that burned up, but not even FFS can fix > that one). > > ext2 needs a lot of help. Evidently it will be getting it soon, though. > > ron > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > -----BEGIN PGP SIGNATURE----- Version: 2.6.3ia Charset: noconv iQB1AwUBOBc49+RxlWKN2EXhAQGu5QL/REghsBodptbhMMnvDdKW5rkjaG7v9Mvh u9YWqQjPTlcbjKzrlncsHjDGp3uVJFhOaAdCehH//lhfzGUz7BOOMz9QJhhHEPdA UoghImMubxscz76Yc+qS3rTVGE/PqnOy =kZOJ -----END PGP SIGNATURE----- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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