Date: Fri, 10 Jan 1997 14:29:58 +0100 (MET) From: Wolfgang Helbig <wh@MX.BA-Stuttgart.De> To: scrappy@hub.org (The Hermit Hacker) Cc: hackers@freebsd.org Subject: Re: mount -o async on a news servre Message-ID: <199701101329.OAA00302@helbig.informatik.ba-stuttgart.de> In-Reply-To: <Pine.BSF.3.95.970110065253.5112P-100000@thelab.hub.org> from The Hermit Hacker at "Jan 10, 97 06:59:08 am"
next in thread | previous in thread | raw e-mail | index | archive | help
> Hiya... > > Exactly *how* dangerous is setting a file system to async? I don't know *exactly* but I mount my /usr all the time async. Yesterday I had a system crash, (the system froze during "make world") but it recovered fine. After it I did another "make world" and this was the first one that succeeded. So mounting async does not seem to dangerous. AFAIK the async option turns off writing every directory change to disk immediately. That means directories will be treated like regular files in this respect, i. e. changes will get to disk during the next sync() call or when the corresponding buffer in the buffer cache is needed for another disk i/o. The update(4) process does a sync every 30 min.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199701101329.OAA00302>