Date: Fri, 14 Mar 2014 13:15:22 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: Ian Lepore <ian@FreeBSD.org> Cc: freebsd-hackers@FreeBSD.org, RW <rwmaillists@googlemail.com> Subject: Re: GSoC proposition: multiplatform UFS2 driver Message-ID: <alpine.BSF.2.00.1403141259030.23427@wonkity.com> In-Reply-To: <1394811577.1149.543.camel@revolution.hippie.lan> References: <CAA3ZYrCPJ1AydSS9n4dDBMFjHh5Ug6WDvTzncTtTw4eYrmcywg@mail.gmail.com> <20140314152732.0f6fdb02@gumby.homeunix.com> <1394811577.1149.543.camel@revolution.hippie.lan>
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On Fri, 14 Mar 2014, Ian Lepore wrote: > On Fri, 2014-03-14 at 15:27 +0000, RW wrote: >> On Thu, 13 Mar 2014 18:22:10 -0800 >> Dieter BSD wrote: >> >>> Julio writes, >>>> That being said, I do not like the idea of using NetBSD's UFS2 >>>> code. It lacks Soft-Updates, which I consider to make FreeBSD UFS2 >>>> second only to ZFS in desirability. >>> >>> FFS has been in production use for decades. ZFS is still wet behind >>> the ears. Older versions of NetBSD have soft updates, and they work >>> fine for me. I believe that NetBSD 6.0 is the first release without >>> soft updates. They claimed that soft updates was "too difficult" to >>> maintain. I find that soft updates are *essential* for data >>> integrity (I don't know *why*, I'm not a FFS guru). >> >> NetBSD didn't simply drop soft-updates, they replaced it with >> journalling, which is the approach used by practically all modern >> filesystems. >> >> A number of people on the questions list have said that they find >> UFS+SU to be considerably less robust than the journalled filesystems >> of other OS's. > > What I've seen claimed is that UFS+SUJ is less robust. This has been my experience. Soft updates are fine, journaling not so much. After enough initial problems, I stopped using it, so it may be better lately. It still prevents using dump(8), though.
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