Date: Wed, 22 Mar 1995 22:09:01 -0800 From: David Greenman <davidg@Root.COM> To: Peter da Silva <peter@bonkers.taronga.com> Cc: terry@cs.weber.edu, hasty@star-gate.com, hackers@FreeBSD.org Subject: Re: Why IDE is bad Message-ID: <199503230609.WAA00166@corbin.Root.COM> In-Reply-To: Your message of "Wed, 22 Mar 95 23:35:37 CST." <199503230535.XAA04934@bonkers.taronga.com>
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>> It should do what the manual page says it does, which is to force all I/O
>> to the filesystem to be done asynchronously.
>
>Um, all I/O to the file system is already done asynchronously. It's got
>internal sequencing of metadata but that shouldn't be visible to the
>process.
It's the metadata I/O that we're talking about. ...and yes, the process
will definately see it if the operation involves lots of file creates. It is
inherently unsafe to do metadata I/O asynchronously, which is why the manual
page says:
async All I/O to the file system should be done asynchronously.
This is a dangerous flag to set, and should not be used
unless you are prepared to recreate the file system
should your system crash.
-DG
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