Date: Sat, 18 Jun 2005 23:34:37 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: lefty@asda.gr Cc: freebsd-questions@freebsd.org Subject: Re: Can't mount partitions with soft-updates enabled with async option Message-ID: <20050618203437.GA1966@gothmog.gr> In-Reply-To: <42B481D0.EFA31599@ene.asda.gr> References: <42B481D0.EFA31599@ene.asda.gr>
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On 2005-06-18 23:19, Lefteris Tsintjelis <lefty@ene.asda.gr> wrote: > I am not sure if I do something wrong here or it is suppose to work that > way but the async option doesn't seem to work for partitions that have > soft-updates turned on. Why would you want to do that? Soft-updates already provides most of the benefits of an async mount plus some extra goodies, like never leaving the filesystem in an inconsistent state. > Can someone please clarify the difference and if the speed difference > (if any) is significant when using the async option instead of the > soft-updates for cases such as the /usr/obj or as a squid data > storage? Is async preferred over soft-updates when data loss is not a > big issue? A speed comparison can be found in "The Design and Implementation of the FreeBSD Operating System". If I'm reading the relevant text correctly, then filesystems softupdates are slightly slower than async mounted filesystems and a hell of a lot faster than synchronous mounts without softupdates. The speed gain of mounting a squid cache as async shouldn't really be that big, but the guarantees of avoiding data loss when a filesystem is mounted with softupdates are too big to ignore :-)
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